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基于耦合损伤本构模型开展了508-3钢在200℃下的循环累积塑性变形模拟研究.通过单轴拉伸和循环加载实验获得了试验数据并拟合确定了材料的损伤本构模型参数,然后利用该本构模型模拟了材料的单调加载变形行为和循环累积塑性变形行为.与经典Chaboche模型的模拟结果相比,耦合损伤的本构模型能更好地模拟508-3钢的单调拉伸行为、应变和应力控制循环软化变形行为,且模拟结果与实验数据吻合良好,为508-3钢制造的核电设备的累积塑性变形模拟奠定了基础.“,”This paper simulated the cyclic cumulative plastic deformation of SA508-3 steel based on damage-coupled constitutive model at 200℃ temperature.Firstly,a series of uniaxial tensile and cyclic loading experiments were conducted to determine the parameters of the damage-coupled constitutive model.Based on the damage-coupled constitutive model,monotonic loading and cyclic plastic deformation were simulated for SA508-3 steel.Compared to the simulation results by Chaboche model,the damage-coupled constitutive model can give a better simulation for monotonic tensile behavior and cyclic softening behavior of 508-3 steel under strain and stress control,agree well with the experimental results,and build the foundation for the cumulative plastic deformation simulation of nuclear equipments made with 508-3 steel.