Control of Shock-Induced Porosity and Failure by Precipitate-Vacancy Interactions.
Abstract
Studies of shock loaded metal crystals indicate that vacancies are produced during passage of a compressive wave and that these vacancies coalesce into pores under the action of the subsequent reflected tensile wave. Such pores are the primary nucleation sites for spall fractures. This mechanism is inferred from the fact that an extremely high density of tangled dislocations results from the compressive shock. Vacancies formed by intersection of these dislocations migrate and coalesce under the influence of the reflected tensile pulse forming pores which then act as crack nuclei. To verify such a mechanism, an Al-4.5 wt % Cu alloy was examined for shock-loading response as a function of precipitate structure which was controlled by prior heat treatment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1974
- Accession Number
- ADA062964
Entities
People
- Victor A. Greenhut
Organizations
- Rutgers University–New Brunswick