Evaluation of constitutive on pure copper by experiment and numerical analyses of plastic wave propagation under incremental torsional impacts
Nakano Motohiro; Kishida Keizo; Yamauchi Yoshiaki; Sogabe Yuji
Abstract:Incremental torsional impact experiments based on the stress bar method revealed that the over stress is uniquely related to the instantaneous plastic strain rate throughout the dynamic deformation in the strain rate jump tests for annealed pure copper. This unique relationship is formulated using an empirical equation of the power law. The precise constitutive equation is evaluated from experimental-numerical analyses of the plastic wave propagation under the incremental torsional impacts. The behavior of the incremental wave propagation is successfully simulated by the empirical equation. This equation is rewritten by a constitutive law based on the dislocation motion. Key Words:torsional impact, copper, constitutive equation, plastic wave, high strain rate