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基于等效试验的蠕变-热疲劳寿命预测方法
引用本文:闫明,孙志礼,杨强,夏春晶,何雪浤.基于等效试验的蠕变-热疲劳寿命预测方法[J].航空学报,2008,29(4):943-947.
作者姓名:闫明  孙志礼  杨强  夏春晶  何雪浤
作者单位:东北大学,机械工程与自动化学院,辽宁,沈阳,110004
基金项目:国家高技术研究发展计划(863计划)
摘    要: 以往的蠕变疲劳寿命预测方法主要是针对蠕变-热机械疲劳提出的,一般不能很好应用于蠕变-热疲劳。由于蠕变 热疲劳试验周期很长,故寿命预测所需的失效数据难以得到。考虑材料的双线性随动强化和蠕变特性,深入研究了蠕变 热疲劳过程中应力和应变的规律。据此,提出把蠕变-热疲劳等效为恒定应力幅和平均应力的热 机械疲劳的寿命预测方法。由于热-机械疲劳试验不需保温时间,所需的试验装置简单、效率高,因此该方法有较好的应用前景。

关 键 词:蠕变  热疲劳  寿命预测  热-机械疲劳  双线性随动强化  

A Creep-thermal Fatigue Life Prediction Method Based on Equivalent Test
Yan Ming,Sun Zhili,Yang Qiang,Xia Chunjing,He Xuehong.A Creep-thermal Fatigue Life Prediction Method Based on Equivalent Test[J].Acta Aeronautica et Astronautica Sinica,2008,29(4):943-947.
Authors:Yan Ming  Sun Zhili  Yang Qiang  Xia Chunjing  He Xuehong
Institution:School of Mechanical Engineering and Automation, Northeastern University
Abstract:Previous life prediction methods of creep fatigue mainly aimed at creep thermo-mechanical fatigue,which is not quite appropriate for creep-thermal fatigue.Because of the long period of the creep-thermal fatigue test,it is difficult to get its failure data.A detailed study of the rules of stress and strain during the creep and thermal fatigue process is made by considering the bilinear kinematic hardening and creep characteristic of the material,and a method for life prediction is proposed by equaling the creep-thermal fatigue to the thermo-mechanical fatigue of constant stress amplitude and mean stress.Since no insulating time is required,this method is effective and simple in the requirement of equipment.Consequently,it may have broad application in future.
Keywords:creep  thermal fatigue  life prediction  thermo-mechanical fatigue  bilinear kinematic hardening
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