Abstract:In order to analyze the parameter sensitivity of dynamic constitutive relationship

the shortcoming of the single factor analysis method was overcome by using the Latin hypercube sampling method in the entire parameter space

and by the use of nonparametric statistical method of spearman rank correlation analysis on constitutive parameters of the random input sample set and objective function of the corresponding output correlation analysis on the result set

the expression to solve the parameter sensitivity equivalently was set up in terms of Spearman rank correlation coefficient.The overall analysis of parameter sensitivity for dynamics relationship was realized.The reliability of the parameter sensitivity analysis results was improved obviously.Based on the parameter sensitivity analysis results

in order to further reduce the computational burden of the constitutive model parameters identification and search the optimal solution rapidly

accurately and reliably

the improved genetic algorithm was established by means of improved niche genetic algorithm

suspicious peak point judgment strategy and local accurate searching technology. The numerical calculation results showed that this method has markedly improved the global search ability of genetic algorithm and has high calculation precision.The parameter sensitivity integrity analysis method and improved genetic algorithm not only can well realize the parameters identification of the dynamic constitutive of titanium alloy

and the high precision recognition for other engineering material dynamic constitutive parameters has important reference value.