jtcam-data-12248: Deformation and cavitation at the spherulite scale of semi-crystalline polymers
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Engineering stress-strain curves have been generated from tensile tests on semi-crystalline thermoplastics, whichmay exhibit non linearity and/or peak stress associated with striction/necking phenomenon of the specimen atthe macroscopic scale. This work addresses this state of deformed specimen, on an isotactic polypropylene, whereirreversible strains have led to a variable cross sectional area along the necked region. 3D images in this region,obtained by using Synchrotron Radiation Computed Tomography with two high resolutions were exploited. The bestresolution (1 pixel length = 0.05μm) allowed a better understanding of the morphology of several deformed spheruliteswithin which polar fan arrangements were clearly detailed. Thanks to the identification of the boundaries of spherulitepatterns, with a 0.7μm resolution, the longitudinal and transverse elongations of larger numbers of spherulites weremeasured. The evolution of the volumetric plastic strains due to cavitation at the spherulitic scale along the neckedregions, was comprehensively analysed. Volume changes at this scale were highlighted, consisting of increases in thecase of void growth followed by a decrease (compaction) at large strains due to the collapse of elongated voids. Theeffects of these results on the establishment of reliable constitutive model are discussed.