改进的θ映射模型模拟DZ125材料的蠕变行为

 曾照辉,全昌彪,刘扬,艾书民

(中国航发湖南动力机械研究所,湖南 株洲 412002)
摘要: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。
关键词:涡轮叶片;镍基高温合金;蠕变;有限元
中图分类号:TG111.8 文献标志码:A doi:10.3969/j.issn.1006-0316.2017.06.005
文章编号:1006-0316 (2017) 06-0026-05
The Improved θ Mapping Model Used to Simulatethe Creep Behavior of DZ125 
ZENG Zhaohui,QUAN Changbiao,LIU Yang,AI Shumin
( Hunan Aviation Powerplant Research Institute, Aero Engine Corporation of China, Zhuzhou 412002, China )
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.
Key words:turbine blade;Ni-based superalloy;creep;FE program
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收稿日期:2017-02-06
作者简介:曾照辉(1981-),男,湖南邵阳人,硕士研究生,工程师,主要研究方向为航空发动机强度及可靠性设计。
 

 

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