Attaining regularization length insensitivity in phase-field models of ductile failure
Journal Article (Journal Article)
A cohesive phase-field model of ductile fracture in a finite-deformation setting is presented. The model is based on a free-energy function in which both elastic and plastic work contributions are coupled to damage. Using a strictly variational framework, the field evolution equations, damage kinetics, and flow rule are jointly derived from a scalar least-action principle. Particular emphasis is placed on the use of a rational function for the stress degradation that maintains a fixed effective strength with decreasing regularization length. The model is employed to examine crack growth in pure mode-I problems through the generation of crack growth resistance (J-R) curves. In contrast to alternative models, the current formulation gives rise to J-R curves that are insensitive to the regularization length. Numerical evidence suggests convergence of local fields with respect to diminishing regularization length as well.
Full Text
Duke Authors
Cited Authors
- Talamini, B; Tupek, MR; Stershic, AJ; Hu, T; Foulk, JW; Ostien, JT; Dolbow, JE
Published Date
- October 1, 2021
Published In
Volume / Issue
- 384 /
International Standard Serial Number (ISSN)
- 0045-7825
Digital Object Identifier (DOI)
- 10.1016/j.cma.2021.113936
Citation Source
- Scopus