【摘要】 为了研究国产超高压容器材料35CrNi3MoVR的包辛格效应和拉伸-压缩弹塑性力学性能，将实际材料模型用于该材料的弹塑性力学模型的描述，进行单轴拉伸-压缩试验，得到不同最大拉伸应变量下的应力-应变曲线，并根据Parker提出的修正随动强化模型，通过数据拟合得到了其实际材料弹塑性本构模型。编制了用于Abaqus的Umat函数，并进行单网格有限元计算，通过有限元法计算结果与单轴拉伸-压缩试验结果的对比，验证了该材料弹塑性本构模型的准确性。给出的弹塑性本构模型将在很大程度上降低因材料模型简化对有限元计算结果的影响，为超高压容器自增强残余应力计算和疲劳寿命预测提供参考。更多还原

【Abstract】 The actual material model is utilized to describe the elastoplastic mechanical behavior of the 35CrNi3MoVR used in Chinese standard ultra-high pressure vessels.The Bauschinger effect and elastoplastic mechanical properties of the material were studied though uniaxial tensile-compression tests,and the stress-strain curves under different maximum tensile stress conditions were obtained.According to the modified kinematic hardening model proposed by Parker,the actual elastoplastic constitutive model of 35CrNi3MoVR was derived through data fitting.The Umat subroutine used for Abaqus was programmed,and the single mesh finite element calculation was carried out.The accuracy of the obtained elastoplastic constitutive model was verified by comparing the results of the finite element method with the experimental results of the uniaxial tension-compression.The elastoplastic constitutive model presented in this paper reduces the influence of material model simplification in the finite element method and positive effects will be taken on the accuracy of autofrettage residual stress and prediction of fatigue life of ultra-high pressure vessels in the future.更多还原