期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 58, 期 2, 页码 187-205出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2009.10.006
关键词
Dynamic fracture; Thermomechanical process; Voids and inclusions; Constitutive behaviour; Finite elements
资金
- NSF [CMMI 0823327]
- Army Research Lab
- ONR/DAPRA D3D
- DoE (Sandia National Lab)
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0823327] Funding Source: National Science Foundation
A thermal-mechanical multiresolution continuum theory is applied within a finite element framework to model the initiation and propagation of dynamic shear bands in a steel alloy. The shear instability and subsequent stress collapse, which are responsible for dynamic adiabatic shear band propagation, are captured by including the effects of shear driven microvoid damage in a single constitutive model. The shear band width during propagation is controlled via a combination of thermal conductance and an embedded evolving length scale parameter present in the multiresolution continuum formulation. In particular, as the material reaches a shear instability and begins to soften, the dominant length scale parameter (and hence shear band width) transitions from the alloy grain size to the spacing between micro-voids. Emphasis is placed on modeling stress collapse due to micro-void damage while simultaneously capturing the appropriate scale of inhomogeneous deformation. The goal is to assist in the microscale optimization of alloys which are susceptible to shear band failure. (C) 2009 Elsevier Ltd. All rights reserved.
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