Contribution à la mise en oeuvre de lois de comportements thermomécaniques issues de l'approche D.N.L.R. dans le cadre des transformations finies

Abstract : To extend the D.N.L.R. formalism to the large transformations, the difficulty lies weil in the treatment of the objectivity. This work is a first attempt to overcome this difficulty. Thus, according to the DNLR formalism which basically uses the Cauchy stress, an effort has been made to identify the associated definition of the strain measurement. More clearly, several objective rates proposed in the literature have been examined. At this stage, we verify within the DNLR thermodynamic framework, the importance of the choice, a priori, of one of these objective rates, on the level of stress really "seen" by the material for a given strain level. Recent works by Xiao, Bruhns and Meyers incited us to use the logarithmic rate in order to perform the temporal integration of the strain rate and to define the strain measurement associated to the Cauchy stress and to ensure the coherency of the behavior law for finite transformations.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/INPL_T_2004_EL_ALAM_H.pdf
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https://hal.univ-lorraine.fr/tel-01750021
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Submitted on : Thursday, March 29, 2018 - 12:36:04 PM
Last modification on : Friday, March 30, 2018 - 1:28:54 AM

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Hanane El Alam. Contribution à la mise en oeuvre de lois de comportements thermomécaniques issues de l'approche D.N.L.R. dans le cadre des transformations finies. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL100N⟩. ⟨tel-01750021⟩

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