文献类型：期刊文献

英文题名：Thermodynamic analysis on two plasticity models considering the time-dependency of metal materials

作者：Meng, Li[1,2];Chen, Wufan[3];Wang, Xiaoyuan[4];Yan, Yabin[4]

机构：[1]Shanghai Jiao Tong Univ, Univ Michigan Shanghai Jiao Tong Univ Joint Inst, Shanghai 200240, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China;[3]Zhejiang Univ, Inst Appl Mech, Sch Aeronaut & Astronaut, Hangzhou 310058, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2020

卷号：25

外文期刊名：MATERIALS TODAY COMMUNICATIONS

收录：;EI(收录号：20204009264981);WOS:【SCI-EXPANDED(收录号:WOS:000600974700001)】；

基金：This work was supported by China Postdoctoral Science Foundation (Grant No. 2020M671705), National Natural Science Foundation of China (Grant No. 11602252), Natural Science Foundation of Shanghai (Grant No. 19ZR1413200), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and Fundamental Research Funds for the Central Universities (Grant No. 50321071915017).

语种：英文

外文关键词：Thermodynamic; Dissipation; Viscoplasticity; Time-dependency; Nickel based supper alloy

摘要：Time-dependency and kinematic hardening are two important features of metal materials, and the corresponding behaviors are the emphases of numerical modeling for the safety evaluation of engineering structures. The robust models should not only capture the deformation characteristics, but also satisfy the fundamental thermodynamic laws. This paper aims at discussing the thermodynamic consistency of a unified viscoplasticity (UVP) model and a non-unified viscoplasticity (NUV) model that possess many characteristics in common. Within the thermodynamic framework, the analytical form of a dissipation potential function is defined, and thus the constitutive equations are derived with the introduction of Helmohltz energy function. Finally, a series experimental data of a Nickel based supper alloy is employed to verify the utility of the models. Different from the UVP model, the contribution of creep in a dissipation potential is considered in NUV model, which significantly improves the accuracy of modeling results in the creep and stress relaxation.