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The dynamic constitutive model of Ti/Ni shape memory alloy based on irreversible thermodynamics theory was established by introducing two internal variab les to characterize phase transformation and plastic deformat ion process. The evolution laws of phase transformation and plastic deformation were deduced respectively by assuming two generalized force associated with the corresponding internal variables .Lat in Hypercube Sampling method is applied to sample among the whole parameter space for constitutive parameter of Ti/Ni alloy dynamic constitutive model based on irreversible thermodynamics theory, and Spearman rank correlat ion analysis of non-parameter statistics method is employed to conduct correlation analysis for random-input sample set of constitutive parameter and the output set of its corresponding objective function. A model is built to solve parameter sensitivity based on Spearman rank correlat ion coefficient, in order to achieve overall analysis of parameter sensitivity. According to results, numerical results, obtained with this method, are well consistent with experimental data. Furthermore, the optimal solution to the dynamic constitutive parameters can be realized with high efficiency, accuracy and reliability v ia the research method on parameter sensitivity analysis and identification put forward in this paper.

Study on Dynamic Constitutive Model and Parameter Analysis of Ti/Ni Shape Memory Alloy Based on Irreversible Thermodynamics