A developed microstructure-based internal state variable (ISV) plasticity damage model is for the first time used for simulating\npenetration mechanics of aluminum to find out its penetration properties. The ISV damage model tries to explain the interplay\nbetween physics at different length scales that governs the failure and damage mechanisms of materials by linking the macroscopic\nfailure and damage behavior of the materials with their micromechanical performance, such as void nucleation, growth, and\ncoalescence.Within the continuum modeling framework, microstructural features of materials are represented using a set of ISVs,\nand rate equations are employed to depict damage history and evolution of the materials. For experimental calibration of this\ndamage model, compression, tension, and torsion straining conditions are considered to distinguish damage evolutions under\ndifferent stress states. To demonstrate the reliability of the presented ISV model, that model is applied for studying penetration\nmechanics of aluminum and the numerical results are validated by comparing with simulation results yielded from the Johnson-\nCook model as well as analytical results calculated from an existing theoretical model.
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