Abstract
A modified form of the “dip test” which includes a long-term stress relaxation was used to examine the plastic deformation of unoriented polypropylene in the pre-yield region of the tensile stress-strain curve. The results show that the deformation behaviour is consistent with a previously proposed model of a plastically inhomogeneous solid. Such a model predicts that the flow stress may be partitioned into two components and the analysis of the results shows that this is reasonable. A similar model was successfully used to describe deformation in high density polyethylene, but the time dependence of the internal stress component is different from that of polypropylene.
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