Comparison of viscoplastic Properties for Polycarbonate, Polypropylene, and High Density Polyethylene
The viscoplastic behavior of high density polyethylene, polypropylene, and polycarbonate under uniaxial tensile loading at constant strain rate and large strains was studied. Standard ASTM samples of the polymers cast by injection molding were tested at room temperature and constant crosshead speed; testing was conducted in the range of 5 to 300 mm/min. A single constitutive relation which captures the plastic flow behavior of all three polymers was found as a function of strain and strain rate in the range of 0.01 to 0.1 s<sup>-1</sup>. The values of the model parameters for each polymer are presented. A relation for the yielding of the polymeric materials as a function of strain rate is also reported.
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