The failure behavior of as-molded and annealed high density polyethylene (HDPE) was studied under impact load. The experimental results show that annealing increased the impact fracture energy of HDPE. It was also found that the rise in the propagation energy was responsible for the increased fracture energy of the annealed specimens. Tension tests on as molded and annealed samples show the generation of voids when the material ahead of the notch yielded under tension. This led to the formation of fibrous structures that absorb more energy resulted in increased fracture energy in annealed specimens as compared to that of as-molded specimens.
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