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Caractérisation microstructurale d'un PEHD semi-cristallin déformé, par tomographie X et diffusion de lumière polarisée

Abstract : This thesis mainly concerns the characterization of High Density Polyethylene (HDPE) at the microscopic scale when mechanically solicited. A first part presents a modeling strategy of the polymer behavior that is representative of the observations at the macroscopic scale and adapted to a good metrology of its constitutive parameters. Then, this work focus on investigation techniques that probe the mesoscopic scale (micrometer scale) through a technique (in-situ) based on the transport of incoherent and polarized light (IPSLT) ; and synchrotron X-ray microtomography. The aim is to understand the phenomena that take place at this scale during the successive phases of matter transformation (which switch from a homogeneous biphasic quasi-isotropic state to a very anisotropic fibrillar mesostructure). We show that this polymer does not exhibit any cavitation phenomena and that contrary to most of the results published in the literature, whitening which can be observed macroscopically is not due to the presence of cavities. This result suggests that the mechanical deformation processes put at stake in elastoviscoplasticity with hyperelastic hardening can take place without paramount porosity mechanisms and paves the way for new scenarios that could explain the microstructure evolution as function of strain
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https://hal.univ-lorraine.fr/tel-01746169
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Arnaud Blaise. Caractérisation microstructurale d'un PEHD semi-cristallin déformé, par tomographie X et diffusion de lumière polarisée. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10023⟩. ⟨tel-01746169⟩

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