Abstract
The failure behavior of composites based on HDPE, which breaks down at the necking stage, and dispersed rubber particles is studied. In was shown that the materials containing at most 8 vol % filler experience the brittle-to-ductile transition with increasing temperature. It was assumed that the ductility retained at elevated temperatures by the composites based on a polymer with unstable neck propagation is due to the interplay of two factors, the decrease in the upper yield point of the matrix polymer and the increase in the polymer draw ratio in the neck. These factors markedly reduce the sensitivity of the materials to the presence of defects and facilitate neck formation and propagation, as well as change the form of the defects from cracks to slitlike pores.
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