Yunfei Li;Xiangguo Zeng;Institute of Systems Engineering, China Academy of Engineering Physics;College of Architecture and Environment, Sichuan University;
Institute of Systems Engineering, China Academy of Engineering Physics;College of Architecture and Environment, Sichuan University;
In this paper, a new physically based constitutive model is developed for hexagonal close-packed metals, especially the Ti-6 A1-4V alloy, subjected to high strain rate and different temperatures based on the microscopic mechanism of plastic deformation and the theory of thermally activated dislocation motion. A global analysis of constitutive parameters based on the Latin Hypercube Sampling method and the Spearman's rank correlation method is adopted in order to improve the identification efficiency of parameters. Then, an optimal solution of constitutive parameters as a whole is obtained by using a global genetic algorithm composed of an improved niche genetic algorithm, a global peak determination strategy and the local accurate search techniques. It is concluded that the proposed constitutive modal can accurately describe the Ti-6 Al-4V alloy's dynamic behavior because the prediction results of the model are in good agreement with the experimental data.
Hexagonal close-packed metals;;Physically based constitutive model;;Dislocation motion;;High strain rate;;Ti-6A1-4V
To explore the background and basis of the node document