A state variable modeling of plasticity and necking under uniaxial tension

Article Abstract:

The neck growth process occuring in metals subjected to uniaxial tension is studied using a state variable constitutive model. The model treats the flow system's accumulated plastic strain as a state variable and is able to take account of its time-rate of change. To evaluate its reliability, the model is employed in experiments involving several f.c.c. metals, including aluminum. Results show that this constitutive model is useful in the analysis of the steady- and unsteady-state behavior of f.c.c. metals.

Research, Metals, Metals (Materials)

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Plastic zone size determination by temperature measurement

Article Abstract:

A temperature-based technique for the determination of the size of elastoplastic zones is shown. A mathematical model representing the one-dimensional thermal problem of the propagation of a plastic zone is developed allowing the use of nonadiabatic temperature measurements in this role. Validation of the model with numerically produced temperature data indicates that the suggested technique produces both accurate and robust estimates for the elastoplasticity boundary.

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Large deformations of semicrystalline polymer modeled using the necking network concept

Article Abstract:

A physically-based elastic model used in the modeling of high temperature polymer deformation can successfully produce realistic shapes in necking polymers, but its elastic nature leads to discrepancies.The development of necks in tensile specimens is described, based on an extension of the model, where rate dependence is simply incorporated, leading to a model of neck development, with less abrupt changes in strain and more realistic predicted shapes.

Testing, Polymers, High temperature materials, Materials at high temperatures

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