Mohamed Guerich

@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}

}

@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}

}

@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}

}

@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}

}

@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}

}

@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}

}