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针对某型燃气轮机定向凝固材料涡轮转子叶片蠕变计算分析的需要,提出了改进的θ映射模型用于模拟定向凝固镍基高温合金DZ125材料的纵向蠕变行为,采用Levenberg-Marquardt优化算法,提取了相应的蠕变材料参数,并将自行编制的Umat子程序嵌入Abaqus有限元软件,对DZ125材料的蠕变行为进行模拟,计算结果与实验数据较好地吻合,验证了改进的θ映射模型的正确性。
Abstract：The improved θ mapping model is put forward to simulate the creep behavior of the directional solidification Ni-based superalloy DZ125 as for the creep problem of a gas turbine rotor blade. The corresponding material constants are extracted by using the Levenberg-Marquardt optimization algorithm. And the FE program Abaqus has been used and the model is written using a User Material subroutine(Umat). The creep behavior of DZ125 is simulated, and calculation results fitting well with experiment dataverifies the correction of the improved θ mapping model.
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DOI：
中图分类号:TG132.3
引用信息:
[1]曾照辉,全昌彪,刘扬等.改进的θ映射模型模拟DZ125材料的蠕变行为[J].机械,2017,44(06):26-30.
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