Abstract
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.
Original language | English (US) |
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Pages (from-to) | 187-205 |
Number of pages | 19 |
Journal | Journal of the Mechanics and Physics of Solids |
Volume | 58 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2010 |
Keywords
- Constitutive behaviour
- Dynamic fracture
- Finite elements
- Thermomechanical process
- Voids and inclusions
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering