Abstract
In order to evaluate a strain rate sensitivity of a dynamic flow stress of FCC metal at very high strain rates, very high strain rate tests are conducted for aluminum at temperatures of 290, 373, and 473K in the strain rate range from about 1×10^3_s^<-1> to 2×10^4_s^<-1>. The flow stress increases steeply above about 5×10^3_s^<-1>. The behavior is interpreted on the basis of a simplified model which can represent a transition in the rate controlling mechanism of dislocation motion from a thermally activated process to a viscous drag. By taking the temperature and stress dependence of the moving dislocation density into consideration, a good agreement between the calculated and measured flow stress is obtained.
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