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Modeling Internal Stresses in the Nonelastic Deformation of Metals
Summary
This materials modeling study used the MATMOD-4V deformation model to explore the roles of short-range and long-range internal stresses during nonelastic deformation of aluminum, introducing new microstructural variables to improve simulation of microplastic straining and cyclic behavior. Accurate models of microplastic deformation at low strain amplitudes are essential for predicting high-cycle fatigue life of structural metals.
The roles of short range and long range internal stresses during nonelastic deformation have been postulated and explored using the MATMOD-4V deformation model. New microstructural variables have been introduced in MATMOD-4V which represent the effects of internal stresses upon deformation. Simulations for aluminum have been performed to demonstrate improved capability to represent small strain deformation behavior and dynamic recovery. Comparisons are made between experimental data and computer predictions of microplastic straining and cyclic deformation.