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Transactions: WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS
Transactions ID Number: 32-762
Full Name: Bilal Taher
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: University of technology of Belfort Monbeliard, Sevenans, 90010 Belfort cedex
Country: FRANCE
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E-mail address: bilal.taher@utbm.fr
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Title of the Paper: Analysis of the Thermal Damage on Homogenized Multi-Materials under Thermo-Mechanical Behavior
Authors as they appear in the Paper: Bilal Taher, Said Abboudi, Rafic Younes
Email addresses of all the authors: bilal.taher@utbm.fr, said.abboudi@utbm.fr, rafic_younes@uqar.qc.ca
Number of paper pages: 12
Abstract: In the recent high technologies, the increasing need of structures having multiple functions orientates designers to combine materials in order to obtain, according to coupling scales, multi-materials structures. These structures, while functioning, are subject to variable thermal load, leading to a damage that can be fatal in some applications. So, the study of the behavior of these structures, while they are under thermal cycling solicitations, seems to be very important in order to be able to predict their lifetime and their response to any applied solicitation. It is obvious that the variation of the nature of thermal and mechanical solicitation in term of amplitude and frequency leads to a variation of the resulting damage. But at the level of our knowledge, this effect is not studied before in the literature on multi-materials. In this work, we propose a numerical analysis of the thermo-elasto-plastic behavior of these multi-materials and their damage under t!
hermal cyclic solicitations, while using the homogenization technique. This study is done in two dimensions on a cylindrical multi-material constituted of two layers, subjected to a periodic heat flux applied in the inner face of this cylinder and an exchange condition on the opposite face. The other faces are supposed isolated. The sample is supposed fixed at the isolated faces and free in the radial direction. The damage model is based on the works of Lemaitre and Chaboche [6]. This damage model is not done for multi-materials; it is applicable only to one material apart. So the homogenization of these multi-materials permits us to study the damage of the multi-layers as it is a unique material. The numerical results are presented for different forms and frequency of heat flux cycling (triangular, square and sinusoidal wave excitations) and for different thicknesses of the multi-material. Finally we do a comparison of the multi-material damage with respect to different he!
at flux excitations
Keywords: Thermal stress, Thermo-mechanical, Damage, Thermo-elasto-plastic, Coupling, Multi-material, Cycling, Thermal load
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