Nonlinear Material Response to Very Rapid Energy Deposition
Abstract
Results of a research effort to examine the nonlinear response of selected materials to rapid energy deposition are summarized. One part of the work focused on examining the response of brittle solids to plane shock waves. The other part of the work focused on understanding the mechanisms for laser energy deposition in transparent dielectrics. The shock wave effort has demonstrated the usefulness of making shear wave measurements for characterizing the shocked state. In fused silica, these measurements led to the finding of reversible, shear enhanced compaction and to a direct determination of stress deviators in the shocked state. The work on polycrystalline calcite represents the first study to use shear wave measurements to understand shock induced phase changes. Shear modulus decrease associated with the calcite transition was observed. The subsequent increase in shear modulus at higher compressions is surprising and, in conjunction with the longitudinal measurements, leads to the possibility that a phase other than calcite III is formed under shock loading. Subject terms: Shear measurements, Phase transitions, Shock waves, Lattice stress, Inelastic deformation, Multiple pulse, Laser damage, Transparent materials, Electron heating, Lattice defects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 23, 1990
- Accession Number
- ADA221932
Entities
People
- P. F. Braunlich
- Y. M. Gupta
Organizations
- Washington State University