摘要
对550℃下30CrMoNiV5-11电站高温部件用钢进行轴向应力控制并带保持时间和恒定内压的疲劳-蠕变交互作用实验。对现有统一粘塑性模型中的塑性应变进行新的定义,改进的新模型中考虑蠕变影响。通过对单轴实验数据进行处理,确定模型参数,并在ANSYS的UMAT子程序中嵌入用户自定义程序,对疲劳-蠕变实验进行仿真,结果与实验数据吻合较好。与不带保持时间的疲劳模拟结果相比可以看出,蠕变作用加速了循环载荷下材料的软化速度。与改进前模型相比较,新模型大大提高了疲劳-蠕变的模拟精度。
Experiment of the steel 30CrMoNiV5-11 used for components in power plant under axial stress-controlled with hold time and constant inner pressure was carried out. By implementing creep into accumulated plastic strain, the hardening rule of viscoplastic constitutive model developed by Ohno-Wang was modified. Norton creep rule was included in the modified model which was implemented in ANSYS FEM software. The material parameters were identified according to the uniaxial data. The fatigue-creep experiment was simulated in ANSYS, The simulation results have a good agreement with the experiment. The result show that creep accelerates the softening speed of material under cyclic loading from the simulation result with and without creep. Comparing with the unmodified model, the new model significantly improves the simulation accuracy of fatigue-creep interaction.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第32期88-91,共4页
Proceedings of the CSEE
