Fundamental Studies in Dynamic Plasticity
Abstract
The principal objective of the research on this project has been to develop improved understanding of the plastic response of metals at strain rates of 100000 1/s and higher. This objective has been pursued primarily by the development of a strain-rate change test for probing the plastic response of a metal being sheared at strain rates of 105 1/s to 106 1/s in a pressure-shear plate impact experiment. Such a test makes it possible to distinguish between the rate sensitivity of the flow stress at fixed dislocation structure, and the rate sensitivity of strain hardening. These effects cannot be distinguished in the usual tests at constant strain rates. A second objective arises form the main result of the research on the principal objective; namely, that the rate sensitivity at high strain rates is associated primarily with the rate sensitivity of strain hardening. Consequently, improved understanding of strain hardening takes on greater importance and had been addressed as a second objective. Quasi-static compression tests have been conducted on aluminum single crystals to clarify the interaction between slip on one slip system and hardening on another. Such clarification is required to allow the development of reliable models for plastic flow based on slip on multiple slip systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 10, 1991
- Accession Number
- ADA237114
Entities
People
- R. J. Clifton
Organizations
- Brown University