Deformation mechanisms and thermal variation in yield regime on polypropylene

Abstract

The comprehension of strain mechanics on semi-cristallines polymers are required to explain their rupture behavior and initiation of plasticity. This study presents the 2D displacements and temperature variation during a tensile test on polypropylene. The analysis of digital image correlation were used to determine Poison's ratio, identify the strain fields and yielding formation mechanisms. The infrared thermography indicates that the adiabatic process onset during the plastic deformation was formed during the alignment of polymer chains in a fibrillar shape and there was no change in temperature before the alignment. The heating zones were governed by post-yeld regime and presented parabolic shapes with peak temperature in the center of this polymer.