摘要
为更好地描述Z2CDN18.12N奥氏体不锈钢的单轴棘轮行为,在统一黏塑性循环本构理论框架下,改进了Abdel-Karim-Ohno模型.将塑性应变记忆面引进各向硬化率中,之后进行模型参数确定,进而用Abdel-Karim-Ohno模型和改进Abdel-Karim-Ohno模型对Z2CDN18.12N奥氏体不锈钢在室温下的单轴棘轮效应进行研究.利用两种模型分别研究了平均应力、应力幅值、应力率及加载历史等对Z2CDN18.12N奥氏体不锈钢单轴棘轮行为的影响.结果表明:在恒定的加载率条件下,单轴棘轮应变水平随平均应力和应力幅值的增大而提高;随应力率的增大而降低,而且对较低的应力率更为敏感;单轴棘轮行为受加载历史影响显著.通过对比两种模型对材料的单轴棘轮行为的预测结果与试验数据,证明了本文改进模型的有效性.
In order to better describe the uniaxial ratcheting behavior of Z2CDN18.12N austenitic stainless steel,the Abdel-Karim-Ohno model was improved under the framework of the unified viscoplastic cyclic constitutive theory.By introducing a plastic strain memory surface into the isotropic hardening rule,the model parameters were determined.Further,the Abdel-Karim-Ohno model and the improved Abdel-Karim-Ohno model were used to predict the uniaxial ratcheting effect behavior of Z2CDN18.12N austenitic stainless steel at the room temperature.The influences of mean stress,stress amplitude,stress rate and loading history on the uniaxial ratcheting strain of Z2CDN18.12N austenitic stainless steel were studied by the two models,respectively.The uniaxial ratcheting strain level increased with the increasing mean stress and stress amplitude,decreased with the increasing stress rate,being more sensitive to the lower stress rate,and the loading history had great influence on the ratcheting behavior.Comparison of the prediction results of the two models with the experimental data proved the effectiveness of the improved model.
作者
陈小辉
刘明月
刘世纪
田育松
CHEN Xiao-hui;LIU Ming-yue;LIU Shi-ji;TIAN Yu-song(School of Control Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第3期392-398,共7页
Journal of Northeastern University(Natural Science)
基金
中央高校基本科研业务费专项资金资助项目(N2123028)
河北省自然科学基金青年基金资助项目(E2021501011).
