Ameni Chaabene; Slim Ben Elechi; Sami Chatti; Mohamed Guerich; Ated Ben Khalifa
Experimental Investigation of the Influence of Process Parameters on the Mechanical Properties of Maraging Steel Produced by Electron Beam Melting Article de journal
Dans: International Journal Of Advanced Manufacturing Technology, vol. 135, p. 3865-3882, 2024.
@article{chaabene_3194,
title = {Experimental Investigation of the Influence of Process Parameters on the Mechanical Properties of Maraging Steel Produced by Electron Beam Melting},
author = {Ameni Chaabene and Slim Ben Elechi and Sami Chatti and Mohamed Guerich and Ated Ben Khalifa},
url = {https://link.springer.com/article/10.1007/s00170-024-14731-0#citeas},
year = {2024},
date = {2024-12-01},
journal = {International Journal Of Advanced Manufacturing Technology},
volume = {135},
pages = {3865-3882},
abstract = {Maraging steels are used in industries that require high precision due to their exceptional mechanical properties. This paper
presents the impact of ten process parameters on the mechanical properties of maraging steel produced via electron beam
melting (EBM). The parameters studied here include printing orientation, scanning speed, beam power, beam diameter,
line offset, layer thickness, scan strategy, number of contours, preheating temperature, and post-processing. The mechanical
properties evaluated are tensile strength, strain at fracture, elongation at failure, energy density, material hardness, porosity,
and surface morphology. The results showed a significant correlation between these mechanical properties and the EBM
parameters. The highest ultimate tensile stress, determined from the tensile test, was recorded at 1491.51 MPa, corresponding
to an energy density of 64.28 J/mm3. The optimal parameters were identified as a line offset of 0.1 mm, a layer thickness
of 50 ?m, a scanning speed of 2800 mm/s, and a beam power of 15 mA. The energy density during EBM in turn affected
microstructure, porosity, and mechanical properties. Furthermore, the study revealed that aging heat treatment had a considerable
impact on the mechanical properties, with the highest tensile strength observed for a sample that had undergone
aging at 460 °C for 8 h. The results show the critical role of process parameters and aging heat treatment in achieving optimal
mechanical properties in EBM-produced maraging steel M789. These findings contribute to the optimization of this
manufacturing technique for industrial applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mohamed Taha Mhiri; Mnaouar Chouchane; Mohamed Guerich; Walid Larbi
Modeling and Analysis of a Macro-fiber Piezoelectric Bimorph Energy Harvester operating in d33-Mode using Timoshenko Theory Article de journal
Dans: Mechanics Of Advanced Materials And Structures, p. 1-15, 2024.
@article{mhiri_2886,
title = {Modeling and Analysis of a Macro-fiber Piezoelectric Bimorph Energy Harvester operating in d33-Mode using Timoshenko Theory},
author = {Mohamed Taha Mhiri and Mnaouar Chouchane and Mohamed Guerich and Walid Larbi},
url = {https://www.peeref.com/journals/5764/mechanics-of-advanced-materials-and-structures},
year = {2024},
date = {2024-04-01},
journal = {Mechanics Of Advanced Materials And Structures},
pages = {1-15},
abstract = {Piezoelectric bimorph cantilevered beams are frequently employed in energy harvesting applications. The use of macro-fiber composites, which combine piezoelectric fibers with rectangular cross-sections and interdigitated electrodes, has significantly enhanced their performance by enabling operation in the 33-mode of piezoelectricity, thereby increasing conversion efficiency. In this paper, the Timoshenko beam theory is applied to overcome the limitations of the Euler-Bernoulli theory in modeling transverse vibrations of harvesters with low slenderness ratios (length to thickness ratios). The mixture rule formulation is applied to determine the equivalent properties of the macro-fiber composite (MFC) structure. The electromechanical properties of a representative volume element (RVE) bounded by two successive interdigitated electrodes are coupled to the overall electro-elastic dynamic model of the structure using the Timoshenko theory. Frequency response functions for the power and tip vibration displacement of the MFC bimorph beam are determined from the model. Experimental data from the literature are used to validate the improved results predicted by the model developed in this paper. A comparative analysis between the electromechanical responses predicted using a model based on Timoshenko and a model based on Euler-Bernoulli theory is conducted showing agreement, for harvesters with large slenderness ratios and discrepancies of up to 30 % for low slenderness ratios. It has also been shown that the model based on Euler-Bernoulli theory overestimates both the mechanical and the electrical responses for low slenderness ratios as the shear and rotary inertia effects are not negligible in this case.},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Ayech Benjeddou; Mohamed Guerich
Free vibration of actual aircraft and spacecraft hexagonal honeycomb sandwich panels: A practical detailed FE approach Article de journal
Dans: Advances in Aircraft and Spacecraft Science, vol. 6, no. 2, p. 169-187, 2019.
@article{benjeddou_892,
title = {Free vibration of actual aircraft and spacecraft hexagonal honeycomb sandwich panels: A practical detailed FE approach},
author = {Ayech Benjeddou and Mohamed Guerich},
url = {http://koreascience.or.kr/article/JAKO201913457808231.page},
year = {2019},
date = {2019-03-01},
journal = {Advances in Aircraft and Spacecraft Science},
volume = {6},
number = {2},
pages = {169-187},
abstract = {This work presents a practical detailed finite element (FE) approach for the three dimensional (3D) free vibration analysis of actual aircraft and spacecraft type lightweight and thin honeycomb sandwich panels. It consists of calling successively in MATLAB®, via a developed user friendly GUI, a detailed 3D meshing tool, a macro commands language translator and a commercial FE solver (ABAQUS® or ANSYS®). In contrary to the common practice of meshing finely the faces and core cells, the proposed meshing tool represents each wall of the actual hexagonal core cells as a single two dimensional (2D) 4 nodes quadrangular shell element or two 3 nodes triangular ones, while the faces meshes are obtained simply using the nodes at the core faces interfaces. Moreover, as the same 2D FE interpolation type is used for meshing the core and faces, this leads to an automatic handling of their required FE compatibility relations. This proposed approach is applied to a sample made of very thin glass fiber reinforced polymer woven composite faces and a thin aluminum alloy hexagonal honeycomb core. The unknown or incomplete geometric and materials properties are first collected through direct measurements, reverse engineering techniques and experimental FE modal analysis based inverse identification. Then, the free vibrations of the actual honeycomb sandwich panel are analyzed experimentally under different boundary conditions and numerically using different mesh basic cell shapes. It is found that this approach is accurate for the first few modes used for pre design purpose.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Amen Tognevi; Mohamed Guerich; Julien Yvonnet
A multi-scale modeling method for heterogeneous structures without scale separation using a filter-based homogenization scheme Article de journal
Dans: International Journal For Numerical Methods In Engineering, vol. 108, no. 1, p. mars-25, 2016.
@article{tognevi_77,
title = {A multi-scale modeling method for heterogeneous structures without scale separation using a filter-based homogenization scheme},
author = {Amen Tognevi and Mohamed Guerich and Julien Yvonnet},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/nme.5200},
year = {2016},
date = {2016-10-01},
journal = {International Journal For Numerical Methods In Engineering},
volume = {108},
number = {1},
pages = {mars-25},
abstract = {A method is proposed to compute the response of highly heterogeneous structures by constructing homogenized models when no scale separation can be assumed. The technique is based on an extended homogenization scheme where the averaging operators are replaced by linear filters to cut off fine scale fluctuations, while maintaining locally varying mechanical fields with larger wavelength. As a result, the constitutive law at an intermediate scale, called mesoscale, arises to be naturally nonlocal by construction, where the kernel operator is fully constructed by computations on the unit cell associated with the microstructure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Trung Hieu Hoang; Mohamed Guerich; Julien Yvonnet
Determining the Size of RVE for Nonlinear Random Composites in an Incremental Computational Homogenization Framework Article de journal
Dans: Journal Of Engineering Mechanics, vol. 142, no. 5, p. 4016018.1 -4016018.11, 2016.
@article{hoang_51,
title = {Determining the Size of RVE for Nonlinear Random Composites in an Incremental Computational Homogenization Framework},
author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet},
url = {https://ascelibrary.org/doi/10.1061/%28ASCE%29EM.1943-7889.0001057},
year = {2016},
date = {2016-05-01},
journal = {Journal Of Engineering Mechanics},
volume = {142},
number = {5},
pages = {4016018.1 -4016018.11},
abstract = {In this paper, the authors address the issue of determining the size of a representative volume element (RVE) in the case of nonlinear random composites with either elastoplastic or elasto-viscoplastic phases. In such a case, the general form of the effective constitutive behavior is not known in advance and the response must be evaluated either by direct numerical computations on the RVE or by an appropriate approximation scheme.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mohamed Guerich; Samir Assaf
Optimization of Noise Transmission Through Sandwich Structures Article de journal
Dans: Journal Of Vibration And Acoustics-Transactions Of The Asme, vol. 135, no. 5, p. 051010, 2013.
@article{guerich_2374,
title = {Optimization of Noise Transmission Through Sandwich Structures},
author = {Mohamed Guerich and Samir Assaf},
url = {https://asmedigitalcollection.asme.org/vibrationacoustics/article-abstract/135/5/051010/380063/Optimization-of-Noise-Transmission-Through?redirectedFrom=fulltext},
year = {2013},
date = {2013-10-01},
journal = {Journal Of Vibration And Acoustics-Transactions Of The Asme},
volume = {135},
number = {5},
pages = {051010},
abstract = {An optimization methodology to increase the noise transmission loss (TL) of damped
sandwich structures is presented. The prediction of the TL uses a numerical tool based on
a finite element formulation for the sandwich plate coupled to a boundary element
method for the acoustic medium. This tool can be used for arbitrarily shaped three-layer
sandwich plates with various boundary conditions and it is well adapted to parametric
and optimization studies. First, a parametric study was conducted to choose the objective
function, the constraints, and the pertinent design variables to use in the optimization
problem which consist in reducing the sound power transmitted by a viscoelastically
damped sandwich plate. Next, by constraining the acoustical behavior of the sandwich panel,
the surface mass of the sandwich structure was minimized. It is shown that a significant
reduction in the transmitted sound power can be achieved by selecting the appropriate
geometric configuration and damping layer material.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Samir Assaf; Mohamed Guerich; Philippe Cuvelier
Vibration and damping analysis of plates with partially covered damping layers Article de journal
Dans: Acta Acustica, vol. 97, p. 553 - 568, 2011.
@article{assaf_2375,
title = {Vibration and damping analysis of plates with partially covered damping layers},
author = {Samir Assaf and Mohamed Guerich and Philippe Cuvelier},
url = {https://acta-acustica.edpsciences.org/},
year = {2011},
date = {2011-03-01},
journal = {Acta Acustica},
volume = {97},
pages = {553 - 568},
abstract = {The constrained-layer damping treatment is widely used to control the resonant response of vibrating structures,
particularly in the automotive and aerospace industries. This technique requires design tools in order to select the
best location, type and thickness of the damping and constraining-layer materials for optimum damping while
minimizing the total weight of the damping treatments. In this study, a numerical tool is presented to analyze the
vibration response of plates partially or fully covered with a constrained viscoelastic damping material. This tool
is based on a finite element approach. The undamped plate structure is modeled using a discrete Kirchhoff theory
(DKT) element. However, a sandwich plate element is specially derived to model the damped plate structure.
This element is formulated in such a way that it is compatible with the DKT element. The natural frequencies
and modal loss factors are derived from the modal strain energy method. The proposed approach is validated
by comparing predictions with the results of various examples published in the literature. Hence, this approach
is shown to predict accurately the damping characteristics of arbitrarily shaped sandwich plates, with different
material properties and boundary conditions, fully or partially covered with constrained viscoelastic layers. The
influence of the damping patch locations and the viscoelastic material's shear modulus on the vibration and
damping characteristics is investigated. To damp the plate effectively using partial coverage, the damping patches
must be distributed appropriately. To select the best damping patch locations, an indicator based on the energy
dissipated through the viscoelastic layer is proposed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Samir Assaf; Mohamed Guerich; Philippe Cuvelier
Vibration and acoustic response of damped sandwich plates immersed in a light or heavy fluid Article de journal
Dans: vol. 88, no. 13-14, p. 870-878, 2010.
@article{assaf_2845,
title = {Vibration and acoustic response of damped sandwich plates immersed in a light or heavy fluid},
author = {Samir Assaf and Mohamed Guerich and Philippe Cuvelier},
url = {https://www.sciencedirect.com/journal/computers-and-structures},
year = {2010},
date = {2010-07-01},
volume = {88},
number = {13-14},
pages = {870-878},
abstract = {This paper presents a finite element formulation to analyze the vibro-acoustic response of plates with
constrained-layer damping treatment. This formulation takes into account the effects of fluid loading.
The governing coupled structural/acoustic equations of motion are solved using a modal approach combined
with an interpolation technique of the reduced radiation impedance matrix components of the
fluid. The numerical results show the accuracy of the proposed approach. In addition, a parametric study
is carried out to highlight the influence of geometrical and material variables on the damping characteristics,
which could be used as design parameters for the optimization problem.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Samir Assaf; Mohamed Guerich
Numerical Prediction of Noise Transmission Loss through Viscoelastically Damped Sandwich Plates Article de journal
Dans: Journal Of Sandwich Structures & Materials, vol. 10, no. 5, p. 359-384, 2008.
@article{assaf_2854,
title = {Numerical Prediction of Noise Transmission Loss through Viscoelastically Damped Sandwich Plates},
author = {Samir Assaf and Mohamed Guerich},
url = {https://journals.sagepub.com/home/jsm},
year = {2008},
date = {2008-09-01},
journal = {Journal Of Sandwich Structures & Materials},
volume = {10},
number = {5},
pages = {359-384},
abstract = {This study describes the numerical prediction of noise transmission
loss (TL) through sandwich plates subjected to an acoustic plane wave or a diffuse sound field excitation. The sandwich plate considered is made up of a viscoelastic core sandwiched between two elastic faces. The model presented is based on a finite
element formulation for the sandwich plate coupled to a boundary element method for the acoustic medium. The plate formulation is derived from Kirchhoff's theory for the elastic faces and Mindlin's theory for the core. The strain and kinetic energies
of the sandwich plates are written in terms of the mean and relative in-plane displacements of the faces and the transverse deflection of the plate. The diffuse sound field is modeled as a superposition of uncorrelated plane waves with equal amplitude. The vibroacoustic equations obtained are discretized using a triangular
finite element. The accuracy of the present model is demonstrated by comparing it with analytical and experimental results available in the literature. New results on laminated glass showing the effects of temperature on the TL are presented.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nicolas Trompette; Mohamed Guerich
An experimental validation of a vibro-acoustic simplified prediction by the use of simplified methods Article de journal
Dans: Applied Acoustics, vol. 66, p. 427- 445., 2005.
@article{trompette_1396,
title = {An experimental validation of a vibro-acoustic simplified prediction by the use of simplified methods},
author = {Nicolas Trompette and Mohamed Guerich},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0003682X04001434},
year = {2005},
date = {2005-01-01},
journal = {Applied Acoustics},
volume = {66},
pages = {427- 445.},
abstract = {Predicting the vibro-acoustic behaviour of a structure is usually done by using the well
established finite element (FE) method and boundary element method. This paper presents
a vibro-acoustic prediction case performed on a metal box using less accurate but simplified
methods: sub-structuring for the calculation of the dynamic response of the structure, and a
monopole distribution for the radiated noise calculation. Both are less accurate but faster
methods than previous ones. An experimental validation was performed. It led to the conclusion
that these methods give precise results and are sufficient for the pre-design of structures in
the low frequency domain. However, this conclusion must be moderated by the fact that in
spite of the simplicity of the structure, the FE model had to be adjusted to the experiments
to yield to a result close to the experiments.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mohamed Guerich; Mohamed Ali Hamdi
A numerical method for vibro-acoustic problems with incompatible finite element meshes using B-Spline functions Article de journal
Dans: Journal Of The Acoustical Society Of America, vol. 105, no. 3, p. 1682-1694, 1999.
@article{guerich_2847,
title = {A numerical method for vibro-acoustic problems with incompatible finite element meshes using B-Spline functions},
author = {Mohamed Guerich and Mohamed Ali Hamdi},
url = {https://pubs.aip.org/asa/jasa},
year = {1999},
date = {1999-03-01},
journal = {Journal Of The Acoustical Society Of America},
volume = {105},
number = {3},
pages = {1682-1694},
abstract = {The paper describes a new method for computing fluid-structure coupling with incompatible finite element meshes using cubic B-spline functions (UCBFs).A modal approach is used which has the advantage of computing the individual structure and fluid mode shapes, using independant meshes. In order to compuiter teh fluide-structural coupling forbthe incompatible meshes, it is necessary to interpolate the structure and fluid mode shapes over a common geometric mesh. This mesh is defined by the mesh itself which is also interpolated bu UCBF using a minimum number of geometric control nodes.New structural and fluid meshes are first derived from the geometric mesh by defining two different elemnt multiplicities. An extrapolation algorithm is then developed to deduce the values of fluid and structural functions (displacement and pressure) over the two new meshes. The UCBs are finally used to interpolate mode shapes of fluid and structure from the two previous meshes into a common mesh. Having the two new functions over the same common mesh provides the fluid-structure coupling for incompatible meshes. The method is illusttrated for 2D and 3D coupled problems corresponding to shells of revolution, plates and 3D shells.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ayech Benjeddou; Mohamed Guerich
5th Tunisian Congress of Mechanics CoTuMe'2020, Hammaet, Tunisia, 2021.
@conference{benjeddou_1355,
title = {On three-dimensional detailed finite element free-vibration analysis of hexagonal honeycomb sandwich panels},
author = {Ayech Benjeddou and Mohamed Guerich},
url = {http://www.cotume.com/en/},
year = {2021},
date = {2021-03-01},
booktitle = {5th Tunisian Congress of Mechanics CoTuMe'2020},
address = {Hammaet, Tunisia},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Julien Yvonnet; Amen Tognevi; G. Bonnet; Mohamed Guerich
A filter-based computational homogenization method for handling non-separated scales problems Conférence
12e Colloque National en Calcul des Structures, Presqu'île de Giens, France, 2015.
@conference{yvonnet_398,
title = {A filter-based computational homogenization method for handling non-separated scales problems},
author = {Julien Yvonnet and Amen Tognevi and G. Bonnet and Mohamed Guerich},
url = {https://csma2015.ec-nantes.fr/session25.html},
year = {2015},
date = {2015-05-01},
booktitle = {12e Colloque National en Calcul des Structures},
address = {Presqu'île de Giens, France},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Trung Hieu Hoang; Mohamed Guerich; Julien Yvonnet
11th World Congress on Computational Mechanics (WCCM XI), Barcelona, Spain, 2014.
@conference{hoang_2848,
title = {A decoupled approach for the response of structures made of heterogeneous, random elastoplastic composites with hardening},
author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet},
url = {https://books.google.fr/books/about/11th_World_Congress_on_Computational_Mec.html?id=m4CSnQAACAAJ&redir_esc=y},
year = {2014},
date = {2014-07-01},
booktitle = {11th World Congress on Computational Mechanics (WCCM XI)},
address = {Barcelona, Spain},
abstract = {In the present work, we propose a methodology to compute the response of structures
made of heterogeneous, random elastoplastic composites. The effective constitutive law is
provided by an incremental homogenization method (see e.g. [1]), which allows computing
very efficiently the stress-strain relationship at the integration points of the structure with-
out local calculations on the RVE. The accuracy of the method is enhanced by identifying
the coefficients of an empirical model related to the matrix, which provides a correction to
the initial incremental homogenization scheme solution. For this purpose, the size of the
RVE is determined for local microstructures consisting into random distribution of elastic
cylinders or pores in a von Mises elastoplastic matrix with nonlinear hardening. Unlike
previous approaches (see e.g. [2, 3]), we determine the size of the RVE by performing
a statistical convergence analysis not on the response of the microstructure, but on the
parameters of the empirical model used for the identification. Numerical results are pro-
vided to demonstrate the accuracy and the efficiency of the technique through structure
examples.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Amen Tognevi; Mohamed Guerich; Julien Yvonnet
11th World Congress on Computational Mechanics (WCCM XI), Barcelona, Spain, 2014.
@conference{tognevi_2849,
title = {Computational modelling of heterogeneous structures without scale separation: an approach based on nonlocal filter-based homogenization},
author = {Amen Tognevi and Mohamed Guerich and Julien Yvonnet},
url = {https://books.google.fr/books/about/11th_World_Congress_on_Computational_Mec.html?id=m4CSnQAACAAJ&redir_esc=y},
year = {2014},
date = {2014-07-01},
booktitle = {11th World Congress on Computational Mechanics (WCCM XI)},
address = {Barcelona, Spain},
abstract = {In the present work, a computational method is proposed to compute the response of
highly heterogeneous structures through a simplied (homogenized) model when no scale
separation can be assumed. Based on a recent theory developed by the authors [1, 2],
a nonlocal constitutive law is rst constructed based on numerical computations on a
unit cell. The homogenization framework is based on the use of linear lters instead of
classical averaging operators and generalizes the classical homogenization theory, leading
naturally to a nonlocal constitutive law. A numerical procedure is developed to compute
the response of structures made of periodic cells by using a coarse mesh, associated to
a wavelength related to a chosen scale of description. Compared to our previous work, a displacement-based strategy is proposed to implement the constructed nonlocal
law in a classical Finite Elements procedure related to the coarse mesh. Unlike other
nonlocal elasticity theories, the present method is fully micro-mechanically-funded and
re-localization can be achieved to analyze local (strain and stress) elds without solving
the fully detailed problem. The methodology is demonstrated by analyzing the response
of structures with heterogeneities which have characteristic dimensions comparable to
those of the structure itself.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Mohamed Taha Mhiri; Walid Larbi; Mnaouar Chouchane; Mohamed Guerich
Modeling and Analysis of a Piezoelectric Bimorph Cantilevered Beam for Vibration Energy Harvesting Book Section
Dans: Springer, (Ed.): Design and Modeling of Mechanical Systems - VI, vol. 4, p. 282-290, Springer, Cham, Springer Nature Switzerland AG, 2024, ISBN: 978-3-031-67152-4.
@incollection{mhiri_3144,
title = {Modeling and Analysis of a Piezoelectric Bimorph Cantilevered Beam for Vibration Energy Harvesting},
author = {Mohamed Taha Mhiri and Walid Larbi and Mnaouar Chouchane and Mohamed Guerich},
editor = {Springer},
url = {https://link.springer.com/chapter/10.1007/978-3-031-67152-4_30},
issn = {978-3-031-67152-4},
year = {2024},
date = {2024-08-01},
booktitle = {Design and Modeling of Mechanical Systems - VI},
volume = {4},
pages = {282-290},
publisher = {Springer, Cham},
address = {Springer Nature Switzerland AG},
abstract = {This paper presents an extensive investigation into the modeling and analysis of a piezoelectric bimorph cantilevered beam designed for vibration energy harvesting. By employing finite element analysis (FEA), the study explores various beam models, encompassing 1D Euler-Bernoulli, 2D, and 3D representations, to determine the eigenfrequencies and electromechanical responses of the energy harvester. The research includes a comparative analysis, which contrasts the results obtained from the proposed FE models with the experimental findings of Erturk and Inman, as well as analytical solutions. The results reveal that the 3D model exhibits minimal error. Additionally, using the 3D model, this work investigates the influence of tip mass shape on the electromechanical response of the system, suggesting that a parallelepiped shape maximizes voltage output while maintaining a lower resonant frequency.},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
Mohamed Taha Mhiri; Mnaouar Chouchane; Mohamed Guerich; Walid Larbi
Modeling and Optimizing a Cantilevered Energy Harvester with Partial Coverage of Macro Fiber Composites Proceedings Article
Dans: 53rd International Congress & Exposition on Noise Control Engineering, Nantes, France, 2024, ISBN: https://internoise2024.org/.
@inproceedings{mhiri_2954,
title = {Modeling and Optimizing a Cantilevered Energy Harvester with Partial Coverage of Macro Fiber Composites},
author = {Mohamed Taha Mhiri and Mnaouar Chouchane and Mohamed Guerich and Walid Larbi},
url = {https://internoise2024.org/},
issn = {https://internoise2024.org/},
year = {2024},
date = {2024-08-01},
booktitle = {53rd International Congress & Exposition on Noise Control Engineering},
address = {Nantes, France},
abstract = {Piezoelectric energy harvesters (PEH) are recognized as smart structural devices, offering researchers an innovative approach to estimate the energy harvested from real vibration sources. This work presents linear analytical methods for predicting the energy harvested from an unimorph cantilevered beam with a proof mass, with a substrate partially covered by a Macro Fiber Composite (MFC) patch. In order to enhance a PEH that can generate more density of electrical power, a new framework for MFC harvesters with discontinuous geometries using Euler-Bernoulli assumptions is proposed. The length of the harvester can be divided into three parts of uniform beams followed by applying appropriate continuity conditions. Mixing rules are used to derive the equivalent properties of the MFC patch which is considered as five layers. The active layer contains a piezoceramic macro fibers embedded within an epoxy matrix, which is fully covered by electrode and Kapton layers. The excitation of the system is assumed to be at its base. The proposed method is validated through experimental comparison issued from the literature. The results indicate that the location of the MFC patch has a significantly affect to the density of electrical power, the optimal resistance and the natural frequencies. Furthermore, this study identifies the optimal location parameters for MFC patch in unimorph harvesters with proof mass.},
note = {25629/08/2024},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Ameni Chaabene; Slim Ben Elechi; Sami Chatti; Mohamed Guerich
Study of the effect of manufacturing parameters on the hardness of electron-beam melted maraging steel: An experimental study Proceedings Article
Dans: The 8th International Conference on Advances in Mechanical Engineering and Mechanics (ICAMEM2024), Sousse - Tunisie, 2024, ISBN: https://icamem.tn/.
@inproceedings{chaabene_3043,
title = {Study of the effect of manufacturing parameters on the hardness of electron-beam melted maraging steel: An experimental study},
author = {Ameni Chaabene and Slim Ben Elechi and Sami Chatti and Mohamed Guerich},
url = {https://icamem.tn/},
issn = {https://icamem.tn/},
year = {2024},
date = {2024-06-01},
booktitle = {The 8th International Conference on Advances in Mechanical Engineering and Mechanics (ICAMEM2024)},
address = {Sousse - Tunisie},
abstract = {Maraging steels are commonly used in industries that require high precision due to their excellent mechanical properties, including high strength, toughness, formability, weldability, dimensional accuracy, and formability. These steels are characterized by a typical martensitic structure obtained through aging heat treatments. The trend towards using high-strength steels in the industry has led to the need to optimize mass while maintaining good mechanical properties for specific applications. Electron beam melting (EBM) is an additive manufacturing technique that offers several advantages over traditional methods. It enables the production of complex geometry parts in small series and the creation of prototypes from CAD models. However, optimizing the parameters of the EBM process is a major challenge due to the complex physical phenomena involved, such as phase and material changes. This study investigates the impact of three EBM process parameters (layer thickness, electron beam power, and preheating temperature) on the hardness of maraging steel. The findings contribute to the improvement of the EBM process and the production of high-quality components. These components have applications in various sectors, including medical, automotive, and aerospace, highlighting the importance of this research for a wide range of advanced applications.},
note = {28620/06/2024},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Taha Mhiri; Walid Larbi; Mnaouar Chouchane; Mohamed Guerich
Modeling and Analysis of a Piezoelectric Bimorph Cantilevered Beam for Vibration Energy Harvesting Proceedings Article
Dans: https://cmsm.tn/CMSM2023/, Hammamet, Tunisia, 2023, ISBN: https://cmsm.tn/CMSM2023/.
@inproceedings{mhiri_2815,
title = {Modeling and Analysis of a Piezoelectric Bimorph Cantilevered Beam for Vibration Energy Harvesting},
author = {Mohamed Taha Mhiri and Walid Larbi and Mnaouar Chouchane and Mohamed Guerich},
url = {https://cmsm.tn/CMSM2023/},
issn = {https://cmsm.tn/CMSM2023/},
year = {2023},
date = {2023-12-01},
booktitle = {https://cmsm.tn/CMSM2023/},
address = {Hammamet, Tunisia},
abstract = {This paper presents an extensive investigation into the modeling and
analysis of a piezoelectric bimorph cantilevered beam designed for vibration energy
harvesting. By employing finite element analysis (FEA), the study explores
various beam models, encompassing 1D Euler-Bernoulli, 2D, and 3D representations,
to determine the eigenfrequencies and electromechanical responses of the
energy harvester. The research includes a comparative analysis, which contrasts
the results obtained from the proposed FE models with the experimental findings
of Erturk and Inman, as well as analytical solutions. The results reveal that the 3D
model exhibits minimal error. Additionally, using the 3D model, this work investigates
the influence of tip mass shape on the electromechanical response of the
system, suggesting that a parallelepiped shape maximizes voltage output while
maintaining a lower resonant frequency.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Ameni Chaabene; Slim Ben Eleuchi; Sami Chatti; Mohamed Guerich
Étude expérimentale de l'influence des paramètres du processus sur la dureté de l'acier maraging fabriqué par la fusion par faisceau d'électrons Proceedings Article
Dans: 10th International Congress on Design and Modelling of Mechanical Systems, Hammamet, Tunisia, 2023, ISBN: https://cmsm.tn/CMSM2023/.
@inproceedings{chaabene_2844,
title = {Étude expérimentale de l'influence des paramètres du processus sur la dureté de l'acier maraging fabriqué par la fusion par faisceau d'électrons},
author = {Ameni Chaabene and Slim Ben Eleuchi and Sami Chatti and Mohamed Guerich},
url = {https://cmsm.tn/CMSM2023/},
issn = {https://cmsm.tn/CMSM2023/},
year = {2023},
date = {2023-12-01},
booktitle = {10th International Congress on Design and Modelling of Mechanical Systems},
address = {Hammamet, Tunisia},
abstract = {- Les aciers maraging sont largement utilisés dans les industries exigeant une grande précision en raison de leurs excellentes propriétés mécaniques, telles qu'une résistance élevée, une grande ténacité, une facilité de mise en forme, une soudabilité, une précision dimensionnelle et une aptitude à la transformation. Ces aciers se caractérisent par une structure martensitique typique obtenue grâce à des traitements thermiques de vieillissement. Avec la tendance industrielle vers l'utilisation d'aciers à haute résistance, il existe une demande croissante d'optimisation de la masse tout en conservant de bonnes propriétés mécaniques pour une application donnée. La fusion par faisceau d'électrons (EBM) est une technique de fabrication additive offrant plusieurs avantages par rapport aux méthodes traditionnelles, notamment la capacité à produire des pièces aux géométries complexes en petites séries et à créer des prototypes à partir de modèles CAO. Toutefois, en raison des phénomènes physiques complexes impliqués dans le processus EBM, tels que les changements de phase et de matériau, l'optimisation des paramètres de processus devient un défi critique. Dans cette étude, nous examinons trois paramètres du processus EBM (le décalage de ligne (line offset), la vitesse de balayage et le nombre de contours) sur la dureté de l'acier maraging dans le processus EBM. Les résultats obtenus contribuent à l'amélioration du processus EBM et à la production des composants de haute qualité. Ces composants trouvent des applications dans diverses industries, notamment la médecine, l'automobile et l'aérospatiale, soulignant l'importance de cette recherche pour un large éventail d'applications de pointe.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Slim Ben Eleuchi; Seddik Shiri; Mohamed Guerich
Sensibilité des coefficients de frottement et des lois d'extrapolations sur la prédiction du retour élastique pour l'acier HSLA420 Proceedings Article
Dans: Proceeding of the Tunisian Congress of Mechanics, Monastir, Tunisia, 2023.
@inproceedings{ben_eleuchi_2373,
title = {Sensibilité des coefficients de frottement et des lois d'extrapolations sur la prédiction du retour élastique pour l'acier HSLA420},
author = {Slim Ben Eleuchi and Seddik Shiri and Mohamed Guerich},
url = {https://www.cotume.tn/proceeding/},
year = {2023},
date = {2023-03-01},
booktitle = {Proceeding of the Tunisian Congress of Mechanics},
address = {Monastir, Tunisia},
abstract = {L'analyse par éléments finis est largement utilisée pour la prédiction du retour élastique, mais la précision dépend fortement des paramètres numériques et physiques. Parmi les paramètres qui affectent la prédiction, on peut citer : le coefficient de frottement, les lois de comportement, la fonction de charge... Dans ce papier, la sensibilité des coefficients de frottement et l'influence d'extrapolation des lois sur la prédiction du retour élastique sont étudiées et analysées. Comme application, nous utilisons un exemple industriel du procédé d'emboutissage : le bavolet d'automobile avec le matériau HSLA420. Toutes les simulations numériques sont effectuées avec le code commercial Pam-stamp 2G.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Guerich; Samir Assaf
Damping optimal design of sandwich beams partially covered with damping patches Proceedings Article
Dans: Proceedings of ISMA2022 including USD2022, Leuven, belgium, 2022, ISBN: 978-90-828931-5-1.
@inproceedings{guerich_2372,
title = {Damping optimal design of sandwich beams partially covered with damping patches},
author = {Mohamed Guerich and Samir Assaf},
url = {https://www.isma-isaac.be/isma2022},
issn = {978-90-828931-5-1},
year = {2022},
date = {2022-09-01},
booktitle = {Proceedings of ISMA2022 including USD2022},
address = {Leuven, belgium},
abstract = {The application of viscoelastic materials in the form of constrained layers in mechanical structures is an
efficient and cost-effective technique for solving noise and vibration problems. This technique requires
design tool to select the best location, type and thickness of the damping treatment. This paper presents a
finite element model for the vibration of beams partially or fully covered with a constrained viscoelastic
damping material. The model is based on Bernoulli-Euler theory for the faces and Timoshenko beam theory
for the core. The sandwich beam finite element is compatible with the conventional C1 finite element for
homogenous beams. To validate the proposed model, several free vibration analyses of fully or partially
covered beams, with different locations of the damping patches and different percent coverage are studied.
The results show that the proposed approach can be used as an effective tool to study the influence of the
location and treatment size on the natural frequencies and the associated modal loss factors.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Trung Hieu Hoang; Mohamed Guerich; Julien Yvonnet
A Numerical Incremental Homogenization Approach to Calculate Elastoplastic Heterogeneous Structures Proceedings Article
Dans: Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering, Heraklion, Greece, 2016, ISBN: ISBN: 978-618-82844-0-1.
@inproceedings{hoang_99,
title = {A Numerical Incremental Homogenization Approach to Calculate Elastoplastic Heterogeneous Structures},
author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet},
url = {https://www.eccomas2016.org/},
issn = {ISBN: 978-618-82844-0-1},
year = {2016},
date = {2016-06-01},
booktitle = {Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering},
address = {Heraklion, Greece},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Amen Tognevi; Mohamed Guerich; Julien Yvonnet
A multi-scale modeling method for heterogeneous structures without scale separation using a filterbased homogenization scheme Proceedings Article
Dans: Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering, Heraklion, Greece, 2016.
@inproceedings{tognevi_291,
title = {A multi-scale modeling method for heterogeneous structures without scale separation using a filterbased homogenization scheme},
author = {Amen Tognevi and Mohamed Guerich and Julien Yvonnet},
url = {https://www.eccomas2016.org/},
year = {2016},
date = {2016-06-01},
booktitle = {Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering},
address = {Heraklion, Greece},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Trung Hieu Hoang; Mohamed Guerich; Julien Yvonnet
Effective size of RVE for finite element analysis of structures made of nonlinear random composites Proceedings Article
Dans: Proceeding of 18th International Conference on Composite Structures (ICCS18),, p. 9090, Lisbon, Portugal, 2015.
@inproceedings{hoang_400,
title = {Effective size of RVE for finite element analysis of structures made of nonlinear random composites},
author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet},
url = {http://conference.mercatura.pt/gestao4/index.php?pagina=1367},
year = {2015},
date = {2015-06-01},
booktitle = {Proceeding of 18th International Conference on Composite Structures (ICCS18),},
volume = {18. Multiscale analysis},
pages = {9090},
address = {Lisbon, Portugal},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Guerich; Trung Hieu Hoang; Julien Yvonnet
An incremental multilevel computational homogenization method for elastoplastic composites Proceedings Article
Dans: Proceeding of 18th International Conference on Composite Structures (ICCS18),, p. 9088, Lisbon, Portugal, 2015.
@inproceedings{guerich_401,
title = {An incremental multilevel computational homogenization method for elastoplastic composites},
author = {Mohamed Guerich and Trung Hieu Hoang and Julien Yvonnet},
url = {http://conference.mercatura.pt/gestao4/index.php?pagina=1367},
year = {2015},
date = {2015-06-01},
booktitle = {Proceeding of 18th International Conference on Composite Structures (ICCS18),},
volume = {16. Numerical methods},
pages = {9088},
address = {Lisbon, Portugal},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Guerich; Julien Yvonnet; G. Bonnet; Amen Tognevi
Filter-based computational homogenization Proceedings Article
Dans: Proceedings of the 1st Pan-American Congress on Computational Mechanic, Buenos Aires, Argentina, 2015, ISBN: ISBN: 978-84-943928-2-5.
@inproceedings{guerich_399,
title = {Filter-based computational homogenization},
author = {Mohamed Guerich and Julien Yvonnet and G. Bonnet and Amen Tognevi},
url = {http://congress.cimne.com/panacm2015/frontal/default.asp},
issn = {ISBN: 978-84-943928-2-5},
year = {2015},
date = {2015-04-01},
booktitle = {Proceedings of the 1st Pan-American Congress on Computational Mechanic},
address = {Buenos Aires, Argentina},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Mohamed Guerich
Modélisation vibro-acoustique des structures (réductions, amortissements, optimisations) & homogénéisation des matériaux composites Thèse
UTC, 2019.
@phdthesis{guerich_903,
title = {Modélisation vibro-acoustique des structures (réductions, amortissements, optimisations) & homogénéisation des matériaux composites},
author = {Mohamed Guerich},
year = {2019},
date = {2019-07-01},
address = {Troyes, France},
school = {UTC},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
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