A generalized Bodner-Partom viscoplastic constitutive model

被引：0
|
作者：
Wang C. [1 ]
Xu K. [1 ]
Qin H. [1 ]
Ma Z. [1 ]
Xie J. [1 ]
Xie Z. [1 ]
机构：
[1] Qingdao Branch, Naval Aviation University, Qingdao
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Bodner-Partom; constitutive model; hardening; powder metallurgy superalloy; viscoplasticity;
D O I：
10.7527/S1000-6893.2021.26009
中图分类号：
学科分类号：
摘要：
To improve the modeling of rate-dependent plasticity and cyclic hardening behaviors of alloys with the Bodner-Partom unified viscoplastic constitutive model, the flow rule is established based on a plastic potential function and no longer limited to Mises criteria. In addition, a plastic strain rate term is introduced to diversify the dynamic recovery of kinematic hardening evolution. By comparing the fit of both generalized and original models with the experimental results, the characterized uniaxial tensile and low-cycle fatigue properties of FGH96 at 550℃ show that the modifications provide sound agreement with the inelastic properties, and the adaptability to overcoming the "oversquare" in hysteresis loop and the capability to express mean stress cyclic relaxation accurately are confirmed. The consideration of different hardening mechanisms brings more flexibility for alloys subjected to high temperature. © 2022 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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