An optimization method to identify parameters of aluminum alloy under the condition of hypervelocity impact

摘要

In the numerical research of hypervelocity impact, how to identify the metallic material's parameters under the extreme distortions and high strain rate is a key problem. In this paper Steinberg strength model and Gruneisen equation of state are selected to describe the characteristics of AL6061 under the condition of hypervelocity impact. The SPH algorithm is applied to simulate the hypervelocity impact. The error between the results of experiment and simulation is defined as the optimization objective and 4 parameters in Steinberg strength model are defined as optimization variables. 4 parameters are identified automatically by SRSM (Successive response surface method). The optimized parameters have a better simulation results than the initial parameters when comparing with the experiments results.