✦ LIBER ✦

Yielding, anisotropy, and deformation processing of polymers

✍ Scribed by S. D. Batterman; J. L. Bassani

Book ID: 104522789
Publisher: Society for Plastic Engineers
Year: 1990
Tongue: English
Weight: 488 KB
Volume: 30
Category: Article
ISSN: 0032-3888
DOI: 10.1002/pen.760302004

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✦ Synopsis

Abstract

Constitutive equations that characterize the deformation induced anisotropy in polymers at large strains are developed for both flow and deformation (nonlinear elastic) theories of plasticity. These equations are used first to predict the evolution of yield surfaces for anisotropies that develop under simple plane strain deformations. Then, non‐uniform deformations are considered including neck propagation and extrusion. Finite element solutions are based on the flow theory version of the constitutive models. Neck propagation loads and draw ratios are found to be sensitive to the degree of anisotropy and pressure sensitivity, while extrusion forces are less so. The results are compared to solutions for an isotropic material with the same effective stress‐strain behavior.

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