Détermination de la variation volumique au cours de la déformation plastique des polymères amorphes sollicités en traction uniaxiale

Abstract : The volume strain of 10 amorphous polymers is determined during uniaxial traction tests. The materials are streched up large deformations. The apparatus measure simultanously the constitutive plastic behavior and the correspondant evolution of the volume strain. The tests are carry out at différent temperatures and strain rate. Some physicals, measurements and microscopic observations allow to follow the evolution of the microstructure of the materials during the deformation. The compaction is due to reorganisation of the marcomolecules. The damage is due to crazing in the materials. ExpérimentaIs artefacts are investigated and we found that the compaction and the damage are amplified by the measurement system. The amplitude of these artefacts depend on the experimental conditions which further some localized mode of plastic deformation. The isochorus constitutive behavior is obtained by corrected from the experimental one by relations which are related to the orientation and to the morphology of the cavities. A model can reproduces in a good manner the intrinsic behavior of the materials of the study. The volume strain is modeled by means of three elementary mechanisms of deformation.
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http://docnum.univ-lorraine.fr/prive/INPL_T_2005_JEAN-ROMAIN_J_M.pdf
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Submitted on : Thursday, March 29, 2018 - 12:35:09 PM
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Jean-Michel Jean-Romain. Détermination de la variation volumique au cours de la déformation plastique des polymères amorphes sollicités en traction uniaxiale. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL048N⟩. ⟨tel-01749986⟩

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