Ductile Failure
Abstract
Work under this grant has proceeded in two areas: (i) combined experimental and numerical studies of the plastic response of metal matrix composites in collaboration with Professor S. Suresh and (ii) analyses of dynamic crack growth in porous plastic solids in collaboration with Dr. V. Tvergaard of the Technical University of Denmark. Dynamic crack growth was analyzed numerically for a plane strain double edge cracked specimen subject to symmetric impulsive tensile loading at the two ends. The material behavior is described in terms of an elastic-viscoplastic constitutive model that accounts for ductile fracture by the nucleation and subsequent growth of voids to coalescence. Two populations of second phase particles are represented, including large inclusions or inclusion colonies with low strength, which result in large voids near the crack tip at an early stage, and small second phase particles, which require large strains before cavities nucleate. The crack growth velocities determined were entirely based on the ductile failure predictions of the material model, and thus this study is free from ad hoc assumptions regarding appropriate dynamic crack growth criteria.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 13, 1989
- Accession Number
- ADA213864
Entities
Organizations
- Brown University