A J2 yield criterion and time and temperature-independent flow theory of plasticity have been applied to study characteristic phenomena observed in tensile tests of some ductile polymers: namely a load drop immediately after yield and stable propagation of a neck along the entire length of the specimen. A trilinear stress-strain curve is used to quantify the effect of material model data on these physical observations.
Neck Propagation in Tensile Tests: A Study Using Rate-Independent, Strain Hardening Plasticity
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Nimmer, R. P., and Miller, L. C. (December 1, 1984). "Neck Propagation in Tensile Tests: A Study Using Rate-Independent, Strain Hardening Plasticity." ASME. J. Appl. Mech. December 1984; 51(4): 759–765. https://doi.org/10.1115/1.3167721
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