Starting from a review of recent research on yield behavior, the author emphasizes the need to extend classical yield criteria in two ways. First, for iso‐tropic polymers, inclusion of a term allowing for the hydrostatic component of stress. Second, for oriented polymers, allowance for differences of behavior in tension and compression. The causes for these differences and progress in defining yield criteria by classical plasticity and by regarding yield behavior as an extension of nonlinear viscoelastic behavior are discussed.
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I. M. Ward (1971) studied this question.
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