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The temperature, the stem length and the strain-rate dependence of the yield stress of polyethylene (PE) is investigated via a modified crystal plasticity approach. Yielding is considered in terms of nucleation and propagation of [001] screw dislocations with Burgers vector c/2 due to migration of 180° chain twist defects. The stress-induced twist motion within the dislocation cores is modeled as...
This study is about crystallographic texture, deformation-induced decrystallization (disaggregation, amorphization), and subsequent recrystallization in rolled and heat treated semi-crystalline (triclinic) PET. Experiments are based on quantitative wide angle X-ray diffraction using an area detector. The change in crystallinity during rolling deformation and heating is analyzed in terms of X-ray data...
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