High-Strain Rate Failure Modeling Incorporating Shear Banding and Fracture
Technical Report,01 Aug 2013,31 Jul 2017
Columbia University New York United States
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This project aims to develop an accurate model for high strain rate failure of metals. This is accomplished through development of a new modeling framework which can capture both shear banding and fracture failure modes at the same time. Both of these modes are observed in dynamic fracture, and yet modeling of these phenomena presents numerous outstanding challenges. Among these challenges are the need to model abroad range of complex nonlinear phenomena such as multiple, possibly interacting fractures and shear bands, and at certain rates the transition from ductile to brittle failure mode. In addition, localization problems such as fracture and shear banding are challenging from a numerical perspective, requiring regularization techniques for robustness and a high resolution level to accurately reproduce the fine scale features of the solution fields. This project addresses these issues by combining a regularized shear band model with the phase field method, a framework for regularized fracture modeling. Specifically, this requires development of the combined model from thermodynamic principles, implementation of the model in a numerical code, and evaluation of the model from the perspective of experimental validation and computational efficiency.