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Conference Papers Year : 2023

Deformation and Cavitation at the Spherulite Scale of Semi-Crystalline Polymers

Lucien Laiarinandrasana
Cristian Ovalle
Peter Cloetens
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  • PersonId : 1045174
Thilo F. Morgeneyer

Abstract

Tensile tests on semi-crystalline thermoplastics generate engineering stress-strain curves, which may exhibit non linearity and/or peak stress associated with a striction/necking of the specimen at the macroscopic scale. This work addresses this state of deformed specimen where irreversible strains lead to a variable cross section area along the necked region. Using Synchrotron Radiation Computed Tomography with two high resolutions, 3D images in this region were exploited. The best resolution (1 pixel = 0.05μm) allowed a better understanding of the morphology of several deformed spherulites within which polar fans arrangement was clearly detailed. For 0.7μm resolution, the longitudinal and transverse elongations of larger number of spherulites were measured. The evolution of the volumetric plastic strain due to cavitation at the spherulitic scale along the necked region was comprehensively analyzed. Volume change at this scale was highlighted, consisting of an increase in the case of void growth followed by a decrease (compaction) at large strain due to the collapse of elongated voids. The effects of these results on the establishment of reliable constitutive model are discussed.
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Dates and versions

hal-04419604 , version 1 (26-01-2024)

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  • HAL Id : hal-04419604 , version 1

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Lucien Laiarinandrasana, Olga Klinkova, Cristian Ovalle, Peter Cloetens, Thilo F. Morgeneyer. Deformation and Cavitation at the Spherulite Scale of Semi-Crystalline Polymers. ACEX 16 - 16th International Conference on Advanced Computational Engineering and Experimenting, Jul 2023, Heraklion - Crete, Greece. ⟨hal-04419604⟩
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