Constitutive Model for the Thermo-viscoplastic Behavior of Hexagonal Close-Packed Metals with Application to Ti-6A1-4V Alloy

【Author】

Yunfei Li;Xiangguo Zeng;Institute of Systems Engineering, China Academy of Engineering Physics;College of Architecture and Environment, Sichuan University;

【Institution】

Institute of Systems Engineering, China Academy of Engineering Physics;College of Architecture and Environment, Sichuan University;

【Abstract】

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.

【Keywords】

Hexagonal close-packed metals;;Physically based constitutive model;;Dislocation motion;;High strain rate;;Ti-6A1-4V

References

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Springer Journals Database

Total: 26 articles

  • [1] SHENG Ying,YI Li-qing,WEI Yong-tao (School of Architecture and Environment,Sichuan University,Chengdu 610065,Sichuan,China), An Improved Genetic Algorithm of Fast Realization in Multimodal Function Optimizations, Journal of Southwest University of Science and Technology,
  • [2] SHENG Ying;ZENG Xiangguo;HAN Tixin;CHEN Jun;College of Architecture and Environment,Sichuan Univ.;Lab.of Computational Physics,Inst.of Applied Physics and Computational Mathematics;, Parameter Sensitivity Analysis and Identification Method for Dynamic Constitutive Relationship of Titanium Alloy, Journal of Sichuan University(Engineering Science Edition),
  • [3] Sia Nemat-Nasser;;Yulong Li, Flow stress of f.c.c. polycrystals with application to OFHC Cu, Acta Materialia,
  • [4] Su-Tang Chiou;;Hsien-Lung Tsai;;Woei-Shyan Lee, Impact mechanical response and microstructural evolution of Ti alloy under various temperatures, Journal of Materials Processing Tech.,

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