304不锈钢非比例多轴时间相关棘轮行为的本构模型研究

Constitutive Model for Non-Proportionally Multiaxial Time-Dependent Ratcheting of 304 Stainless Steel

基于304不锈钢在不同加载速率和不同保持时间下得到的非比例多轴时相关棘轮行为的实验研究结果,在Abdel-Karim-Ohno模型的基础上,建立了一个非比例多轴时间相关循环本构模型。该模型通过在背应力演化律中引入与非比例度相关的静力恢复项,在各向同性硬化律中引入Tanaka非比例度来考虑非比例路径对时间相关棘轮行为的影响。模拟结果与实验结果的比较表明:该本构模型对室温和高温下多轴时间相关棘轮行为的演化规律均能给予较合理的描述。

ased on the experimental results of non-proportionally multiaxial time-dependent ratcheting of 304 stainless steel at different stress rates and hold-times, a new non-proportionally multiaxial time-dependent constitutive model is proposed by extending Abdel-Karim-Ohno＇s non-linear kinematic hardening rule. The model describes the non-proportionally multiaxial time-dependent rateheting by adding non-proportional static recovery term into the kinematic hardening rule and employing Tanaka＇s non-portionality in the isotropic hardening rule. Finally, the capability of the model to describe the non-proportionally multiaxial time-dependent ratcheting is discussed by comparing the simulations with corresponding experiments. It is shown that the developed model can describe the non-proportionally multiaxial time-dependent ratcheting of 304 stainless steel at room temperature and high temperature reasonably.