Abir Ben Abdallah; Achraf Kallel; Abbas Tcharkhtchi; Tarek Hassine; Fehmi Gamaoun
Modeling of viscoelastic behavior of a shape memory polymer blend Article de journal
Dans: Journal Of Applied Polymer Science, vol. 2021, no. 2021, p. 1-8, 2021.
@article{ben_abdallah_1721,
title = {Modeling of viscoelastic behavior of a shape memory polymer blend},
author = {Abir Ben Abdallah and Achraf Kallel and Abbas Tcharkhtchi and Tarek Hassine and Fehmi Gamaoun},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.51859},
year = {2021},
date = {2021-11-01},
journal = {Journal Of Applied Polymer Science},
volume = {2021},
number = {2021},
pages = {1-8},
abstract = {Shape memory effect (SME) of polymers is a property that concerns both,
macroscopic and microscopic changes. The variation of internal polymer
properties such, as molecular weight (Mw), rigidity, and viscoelasticity could
alter its SME. In this study, a bi-parabolic model with six parameters is used to
describe the viscoelastic behavior of a shape memory polymer (SMP) blend
(40% poly(caprolactone), PCL/60% Styrene-Butadiene-Styrene) with different
PCL Mw. These parameters are determined using the Cole-Cole method.
Modeling curves (E00 = f (E0)) will be then compared to experimental data from
dynamical mechanical analysis (DMA) tests. It is shown that the bi-parabolic
model predicts well the behavior of the SMP mixture for different Mw of PCL.
Afterwards, the evolution of the model parameters with the Mw of PCL is
investigated. It is revealed that, when Mw of PCL drops, the relaxation modulus
E0 increases. This result proves that the rigidity of the SMP blend rises with
Mw declines.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Achraf Kallel; Abir Ben Abdallah; Fehmi Gamaoun; Abbas Tcharkhtchi; Hachmi BenDaly; Joseph Fitoussi
Driving force for shape memory effect of polymers Article de journal
Dans: Journal Of Polymer Research, vol. 28, no. 10, p. 308, 2021.
@article{kallel_1585,
title = {Driving force for shape memory effect of polymers},
author = {Achraf Kallel and Abir Ben Abdallah and Fehmi Gamaoun and Abbas Tcharkhtchi and Hachmi BenDaly and Joseph Fitoussi},
url = {https://link.springer.com/article/10.1007/s10965-021-02637-4},
year = {2021},
date = {2021-07-01},
journal = {Journal Of Polymer Research},
volume = {28},
number = {10},
pages = {308},
abstract = {In this study, we aim to evaluate the shape memory effect of a Poly (Caprolactone) (PCL) (40%) and a Styrene-Butadiene-Styrene (SBS) (60%) blend. Shape memory cycle tests are performed at different temperatures to detect the best recovery rate. Under appropriate temperature, the blend recovers substantially its original shape. To study the recovery rate evolution, multi cycle tests are realized with controlled temperature. The results indicate that the shape memory effect growths when the number of cycle increases. The stored energy acts as a driving force to bring the polymer to its permanent shape after each loading cycle. Then, an original method is proposed to measure the stress-strain evolution during the recovery. With a variable temperature, no standard test can follow the stress-strain evolution. This test is needed to validate the behavior model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abir Ben Abdallah; Fehmi Gamaoun; Achraf Kallel; Abbas Tcharkhtchi
Molecular weight influence on shape memory effect of shape memory polymer blend ( poly(caprolactone)/styrene-butadiene-styrene ) Article de journal
Dans: Journal Of Applied Polymer Science, vol. 138, no. 5, p. 49761, 2021.
@article{ben_abdallah_1269,
title = {Molecular weight influence on shape memory effect of shape memory polymer blend ( poly(caprolactone)/styrene-butadiene-styrene )},
author = {Abir Ben Abdallah and Fehmi Gamaoun and Achraf Kallel and Abbas Tcharkhtchi},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.49761},
year = {2021},
date = {2021-02-01},
journal = {Journal Of Applied Polymer Science},
volume = {138},
number = {5},
pages = {49761},
abstract = {The shape memory effect (SME) does not only concern the macroscopic structure. It concerns also the polymer structure at morphological, macromolecular, and molecular scales. This effect may depend on different physicochemical properties like morphology heterogeneity, chain rigidity, steric hindrance, chain polarity, free volume, cross-linking or entanglement density, molecular shape and weight, and so on. Hence, finding the relationship between the SME and these properties is very important. This can help to obtain the knowledge about the phenomenon origin and mechanism. One of the basic polymer properties, which can have direct SME, may be the molecular weight (Mw). The question here is: If the Mw of a shape memory polymer (SMP) changes, for different reasons like degradation, what will be the effect of this change on its SME. In order to answer to this question, the investigation is focused on an SMP blend of 40% poly(?-caprolactone) (PCL) and 60% styrene-butadiene-styrene (SBS). Then, enzymatic hydrolysis is performed on this blend to change its Mw. It is shown that this change is only related to the variation in the Mw of PCL. After that, different samples with a distinct average Mw are prepared and characterized by various experimental methods. Shape memory tests are performed on these blends, and the recovery rate (Rr) for each of them is determined. It is found that when Mw of PCL decreases, its degree of crystallinity, its glass transition, and its melting temperatures, corresponding to the PCL phase, increase. However, the elongation at break of the blend declines with the reduction in Mw. The tests show that the alteration in the blend's Mw influences its SME. Indeed, Rr of the (PCL/SBS) mixture drops with the decrease in Mw of PCL.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abir Ben Abdallah; Achraf Kallel; Fehmi Gamaoun; Abbas Tcharkhtchi
Enzymatic Hydrolysis of Poly (Caprolactone) and its Blend with Styrene-Butadiene-Styrene (40% PCL/60% SBS) Article de journal
Dans: Journal Of Polymers And The Environment, vol. 27, p. 2341-2351, 2019.
@article{ben_abdallah_992,
title = {Enzymatic Hydrolysis of Poly (Caprolactone) and its Blend with Styrene-Butadiene-Styrene (40% PCL/60% SBS)},
author = {Abir Ben Abdallah and Achraf Kallel and Fehmi Gamaoun and Abbas Tcharkhtchi},
url = {https://link.springer.com/article/10.1007%2Fs10924-019-01522-y},
year = {2019},
date = {2019-11-01},
journal = {Journal Of Polymers And The Environment},
volume = {27},
pages = {2341-2351},
abstract = {In this study, we aim to evaluate the effect of enzymatic hydrolysis on aliphatic polyester and on its shape memory blend. Therefore, the hydrolysis of poly (?-caprolactone) (PCL) and of its shape memory polymer (SMP) blend [40% PCL/60% styrene-butadiene-styrene (SBS)] in a solution containing an Amano lipase from pseudomonas fluorescence and a phosphate buffered saline (PBS), is achieved. An appropriate characterization helps to better understand the behaviour of these polymers. So, the properties of these materials prior and after hydrolytic degradation are investigated. When they are submitted to enzymatic hydrolysis, the physico-chemical and mechanical properties of PCL and its blend (PCL/SBS) change. PCL undergoes a significant decrease in weight during enzymatic hydrolysis. Yet, blending PCL with SBS considerably reduces its degradation rate in terms of weight drop, compared with pure PCL. The enzymatic hydrolysis causes chains splitting, which rises their mobility and facilitates their reorientation. Consequently, for PCL and its blend, the degree of crystallinity Xc rises during hydrolytic degradation, which confirms that the amorphous regions of PCL are more susceptible to hydrolysis. Besides, this continuous rise in crystallinity causes the augmentation of PCL and its blend melting, crystallization and glass transition temperatures. Moreover, the PCL brittleness increases, and the blend ductility decreases with the enzymatic hydrolysis time. For both, PCL and its blend, the young modulus displays two opposite effects; it goes up due the growth of crystallinity, but at the end of hydrolysis, its value goes down because of weight loss.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Achraf Kallel; Imade Koutiri; Elham Babaeitorkamani; Alireza Khavandi; Morteza Tamizifar; Mohammadali Shirinbayani; Abbas Tcharkhtchi
Study of bonding formation between the filaments of PLA in FFF process Article de journal
Dans: International Polymer Processing, vol. 4, p. 01-nov, 2019.
@article{kallel_891,
title = {Study of bonding formation between the filaments of PLA in FFF process},
author = {Achraf Kallel and Imade Koutiri and Elham Babaeitorkamani and Alireza Khavandi and Morteza Tamizifar and Mohammadali Shirinbayani and Abbas Tcharkhtchi},
url = {https://www.hanser-elibrary.com/doi/10.3139/217.3718},
year = {2019},
date = {2019-08-01},
journal = {International Polymer Processing},
volume = {4},
pages = {01-nov},
abstract = {Fused filament fabrication (FFF) is an additive manufacturing (AM) process that provides physical objects commonly used for modeling, prototyping and production application. The major drawback of this process is poor mechanical property due to the porous structure of final parts. This process requires careful management of coalescence phenomenon. In this paper, the major influencing factors during the FFF process of poly(lactic acid) (PLA) were investigated experimentally and with a numerical model. It has been shown that the polymer temperature has a significant effect on rheological behavior of PLA especially on adhesion of the filaments. An experimental set-up has been placed in the machine to have the cyclic temperature of the filament. A variation of the polymer temperature influences process parameters such as feed rate, temperature of nozzle and temperature of the platform. The results showed that the amount of polymeric coalescence (neck growth) rises when increasing the feed rate, the nozzle temperature, and the platform temperature. A model to predict the neck growth is proposed. It predicts a lower amount of neck growth value than obtained with experimentally. This difference has been explained as the effect of other phenomena, such as polymer relaxation time, pressure of the nozzle and especially cyclic temperature which is not taken into account in the model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nader Haddar; Riadh Elleuch; Noura Hadjkacem; Achraf Kallel
Modelling and analysis of a deep-drawing operation Conférence
6th International Conference on Advances in Mechanical Engineering and Mechanics, Hammamet, Tunisia, 2015.
@conference{haddar_404,
title = {Modelling and analysis of a deep-drawing operation},
author = {Nader Haddar and Riadh Elleuch and Noura Hadjkacem and Achraf Kallel},
url = {http://www.annonces.rnu.tn/fr-en/???=27&idann=20094&l=fr},
year = {2015},
date = {2015-12-01},
booktitle = {6th International Conference on Advances in Mechanical Engineering and Mechanics},
address = {Hammamet, Tunisia},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Bassem Benlazreg; Achraf Kallel; A. Massol
Optimized design for 3D printing Conférence
The 8th European Altair Technology Conference, Paris, France, 2015.
@conference{benlazreg_1132,
title = {Optimized design for 3D printing},
author = {Bassem Benlazreg and Achraf Kallel and A. Massol},
url = {https://www.altair.com/news/8th-european-altair-technology-conference-attracts-650-simulation-and-engineering-experts},
year = {2015},
date = {2015-10-01},
booktitle = {The 8th European Altair Technology Conference},
address = {Paris, France},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Richard Rieder; Achraf Kallel; Andreas Mehrle; Abbas Tcharkhtchi
Modeling of the thermomechanical behavior of shape memory polymers Inproceedings
Dans: PPS Europe-Africa 2019 Regional Conference, Pretoria, South Africa, 2020.
@inproceedings{rieder_1022,
title = {Modeling of the thermomechanical behavior of shape memory polymers},
author = {Richard Rieder and Achraf Kallel and Andreas Mehrle and Abbas Tcharkhtchi},
url = {https://www.pps2019.com/},
year = {2020},
date = {2020-11-01},
booktitle = {PPS Europe-Africa 2019 Regional Conference},
address = {Pretoria, South Africa},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Martin Gschosser; Andreas Mehrle; Achraf Kallel; Abbas Tcharkhtchi
Introduction of the diffusion stage into the bubble growth model Inproceedings
Dans: 23rd International Conference on Mechatronics Technology, Salerno, Italy, 2019.
@inproceedings{gschosser_1023,
title = {Introduction of the diffusion stage into the bubble growth model},
author = {Martin Gschosser and Andreas Mehrle and Achraf Kallel and Abbas Tcharkhtchi},
url = {http://www.icmt2019.org/},
year = {2019},
date = {2019-10-01},
booktitle = {23rd International Conference on Mechatronics Technology},
address = {Salerno, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Abir Ben Abdallah; Achraf Kallel; Fehmi Gamaoun; Abbas Tcharkhtchi
Enzymatic Hydrolysis influence on the shape memory effect of the shape memory polymer blend (60% SBS/40% PCL) Inproceedings
Dans: European Polymer Congress, Heraklion, Greece, 2019.
@inproceedings{ben_abdallah_896,
title = {Enzymatic Hydrolysis influence on the shape memory effect of the shape memory polymer blend (60% SBS/40% PCL)},
author = {Abir Ben Abdallah and Achraf Kallel and Fehmi Gamaoun and Abbas Tcharkhtchi},
url = {https://epfcrete2019.org/},
year = {2019},
date = {2019-06-01},
booktitle = {European Polymer Congress},
address = {Heraklion, Greece},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Abir Ben Abdallah; Achraf Kallel; Fehmi Gamaoun; Abbas Tcharkhtchi
Dans: Proceedings of the Second International Conference on Advanced Materials, Mechanics and Manufacturing (A3M'2018), Hammamet, Tunisia, 2018, ISBN: ISBN : 978-3-030-24247-3.
@inproceedings{ben_abdallah_641,
title = {Enzymatic Hydrolytic degradation influence on crystallinity and thermal properties of Poly (Caprolactone) and of its blend with Styrene-Butadiene-Styrene (40% PCL / 60%SBS)},
author = {Abir Ben Abdallah and Achraf Kallel and Fehmi Gamaoun and Abbas Tcharkhtchi},
url = {https://www.springer.com/gp/book/9783030242466},
issn = {ISBN : 978-3-030-24247-3},
year = {2018},
date = {2018-12-01},
booktitle = {Proceedings of the Second International Conference on Advanced Materials, Mechanics and Manufacturing (A3M'2018)},
address = {Hammamet, Tunisia},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Abir Ben Abdallah; Achraf Kallel; Fehmi Gamaoun
Shape Memory Property and Driving Force of the shape Memory Blend (40%PCL / 60%SBS) Inproceedings
Dans: Proceedings of the 7th Conference on Design and Modeling of Mechanical Systems, Hammamet, Tunisia, 2017, ISBN: ISBN 978-3-319-66697-6.
@inproceedings{ben_abdallah_267,
title = {Shape Memory Property and Driving Force of the shape Memory Blend (40%PCL / 60%SBS)},
author = {Abir Ben Abdallah and Achraf Kallel and Fehmi Gamaoun},
url = {https://www.springer.com/gp/book/9783319666969},
issn = {ISBN 978-3-319-66697-6},
year = {2017},
date = {2017-03-01},
booktitle = {Proceedings of the 7th Conference on Design and Modeling of Mechanical Systems},
address = {Hammamet, Tunisia},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Achraf Kallel; M. Lamraoui; Joseph Fitoussi; Abbas Tcharkhtchi
The residual stress effect on the shape memory polymers Inproceedings
Dans: 10th International Conference on Residual Stresses (ICRS10), Sydney, Australia, 2016, ISBN: ISBN : 978-194-52911-7-3.
@inproceedings{kallel_101,
title = {The residual stress effect on the shape memory polymers},
author = {Achraf Kallel and M. Lamraoui and Joseph Fitoussi and Abbas Tcharkhtchi},
url = {https://www.mrforum.com/product/residual-stresses-2016/},
issn = {ISBN : 978-194-52911-7-3},
year = {2016},
date = {2016-07-01},
booktitle = {10th International Conference on Residual Stresses (ICRS10)},
address = {Sydney, Australia},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Achraf Kallel; Salim Bouabdallah; Jean-Marc Roelandt
A review of different formulations for mortar Contact enforce constraint Inproceedings
Dans: A review of different formulations for mortar Contact enforce constraint, Mascara, Algeria, 2013.
@inproceedings{kallel_1726,
title = {A review of different formulations for mortar Contact enforce constraint},
author = {Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt},
url = {https://www.researchgate.net/publication/337398391_A_review_of_different_formulations_for_mortar_contact_constraint_enforcement},
year = {2013},
date = {2013-11-01},
booktitle = {A review of different formulations for mortar Contact enforce constraint},
address = {Mascara, Algeria},
abstract = {A framework is presented within which the mortar element method is readily applied to contact problem. This paper describes different formulations to enforce contact constraint. The proposed traitement of contact by using penalty, Lagrange multipliers and augmented Lagrange multipliers techniques is essentially for frictionless contact. For the different three formulations of contact we presented a set of numerical exemples.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Achraf Kallel; Salim Bouabdallah; Jean-Marc Roelandt
A Mortar algorithm for finite deformation contact problems Inproceedings
Dans: A Mortar algorithm for finite deformation contact problems, Bordeaux, France, 2013.
@inproceedings{kallel_1727,
title = {A Mortar algorithm for finite deformation contact problems},
author = {Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt},
url = {http://documents.irevues.inist.fr/bitstream/handle/2042/52925/p_Z64L61F2.pdf?sequence=1},
year = {2013},
date = {2013-08-01},
booktitle = {A Mortar algorithm for finite deformation contact problems},
address = {Bordeaux, France},
abstract = {For the simulation of contact problems with the finite element method we usually use the NTS (Node-To-
Segment) formulation for transmitting contact constraints from one body to another. The use of the NTS
method involves a loss of accuracy in the calculation of the displacements and stresses in the contact area
because of the node-wise contact constraint enforcement. We can overcome this problem by using the mortar
method [1] which has been successfully applied to solve contact problems with finite deformations. The
enforcement of contact constraints is applied in a weak sense throughout the contact interface. In this work,
we describe several techniques for solving contact problems using the mortar approach. The penalty
technique [2], the Lagrange multipliers method [2-3] and the augmented Lagrangian formulation [4-5] are
used for solving various numerical problems. A simplified algorithm is described to implement these types of
formulations.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Achraf Kallel; Salim Bouabdallah; Jean-Marc Roelandt
'A single scheme for two-dimensional problems mortar frictional touch Inproceedings
Dans: ICCCM 2013 Proceedings, Leece, Italy, 2013.
@inproceedings{kallel_1728,
title = {'A single scheme for two-dimensional problems mortar frictional touch},
author = {Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt},
url = {http://eccomas.cimne.com/cvdata/cntr1/spc10/dtos/img/mdia/ICCCM2013-proceedings.pdf},
year = {2013},
date = {2013-07-01},
booktitle = {ICCCM 2013 Proceedings},
address = {Leece, Italy},
abstract = {During the last decade, the mortar method for contact problems discretization has gained a large popularity in the literature to overcome the drawbacks of the traditional NTS method (Node-toSegment). This method is derived from a technique originally used for domain decomposition. The connection between the bodies in contact is realized via integration over the contact surface (in a weak sense) which ensures stress continuity at the interface. In addition, this method alleviates the
limit of the contacting mesh interpolation order and passes the patch test.
The contact constraint enforcement in mortar method, as in NTS method could be achieved
through different formulations. These are penalty formulation [1], Lagrange multipliers [2] and augmented Lagrangian method [3] and [4].},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Achraf Kallel
La fabrication additive étend ses usages Divers
IT for Business, 2017.
@misc{kallel_204,
title = {La fabrication additive étend ses usages},
author = {Achraf Kallel},
url = {https://www.pressreader.com/france/it-for-business/20170522/283257392797229},
year = {2017},
date = {2017-05-01},
howpublished = {IT for Business},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
Achraf Kallel
L'impression 3D : Mythes et Réalités Divers
CAD Magazine, 2017.
@misc{kallel_1171,
title = {L'impression 3D : Mythes et Réalités},
author = {Achraf Kallel},
url = {http://www.groupe-cimax.fr/mag/197-cad-magazine-mai-2017-papier},
year = {2017},
date = {2017-05-01},
howpublished = {CAD Magazine},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
Achraf Kallel
Le Parisien Economie, 2017.
@misc{kallel_203,
title = {Digitalisation, autonomie, développement durable : l'horizon du secteur automobile ne cesse de s'élargir et de proposer de nouvelles carrières passionnantes},
author = {Achraf Kallel},
url = {http://fr.1001mags.com/parution/le-parisien-economie/numero-313s-13-mar-2017/page-12-13-texte-integral},
year = {2017},
date = {2017-03-01},
pages = {41609},
howpublished = {Le Parisien Economie},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
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