GH30合金疲劳-蠕变概率模型的研究

Investigation on probabilistic model for fatigue-creep failure of alloy GH30

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要: 基于疲劳-蠕变特性函数基础上,提出了针对镍基高温合金材料的疲劳-蠕变耦合失效模式的概率模型的研究方法.针对镍基合金GH30的连续疲劳-蠕变交互作用的试验结果,确定了GH30在600℃温度下的疲劳-蠕变特性函数,考虑随机因素后,进行了GH30材料在疲劳-蠕变耦合失效模式下的概率模型分析,研究表明随机因素对材料的失效概率很大,通过灵敏度分析可确定影响破坏的主要因素以提高寿命.
- 航空、航天推进系统 /
- 疲劳-蠕变 /
- 概率模型 /
- 可靠度 /
- 失效概率
Abstract: Aprobabilistic model for fatigue-creep reliability analysis was studied based on the deterministic fatigue-creep failure function,and the corresponding approach was proposed.Fatigue-creep failure function of alloy GH30 at 600 ℃ was established by using the experimental results under continuous cyclic creep.With consideration of random variables,probabilistic analysis for fatigue-creep of alloy GH₃₀ was performed.The calculations show that random variables do great contributions to the failure probability.Furthermore,the effect of different variables on failure probability can be revealed through the sensitivity analysis,helping to improve the components' life.
- aerospace propulsion system /
- fatigue-creep /
- probabilistic model /
- reliability /
- failure probability

[1]	徐灏.疲劳强度[M].北京:高等教育出版社,1988.
[2]	高镇同,熊峻江.疲劳可靠性[M].北京:北京航空航天大学出版社,2000.
[3]	姚卫星.结构疲劳寿命分析[M].北京:国防工业出版社,2003.
[4]	陈杰富,李厚毅,林洪书,等.12CrlMoV钢制部件疲劳-蠕变交互作用特性曲线的研究[J].发电设备,2004,1;43-47.CHEN Jiefu,LI Houyi,LIN Hongshu,et al.Study on creep-fatigue interaction characteristic curves of parts made of 12CrlMoV steel[J].Equipment of Generating Electricity,2004,1:43-47.
[5]	Mao H Y,Mahadevan S.Reliability analysis of creep-fatigue failure[J].International Journal of Fatigue,2000,22:789-797.
[6]	Yaguchi M,Nakamura T,Ishikawa A,et al.Creep-fatigue damage assessment by subsequent fatigue straining[J].Nuclear Engineering and Design,1996,16:97-106.
[7]	Zhang W,Miller K J.A study of cumulative fatigue dam age under variable loading-mode conditions[J].Fatigue and Fracture of Engineering Materials and Structures,1996,19 (2/3):229-239.
[8]	王翔.GH30镍基合金的蠕变和蠕变-疲劳交互作用的研究[D].合肥:中国科学院固体物理研究所,1993.WANG Xiang.Investigation on creep and creep-fatigue interaction in a nickel based alloy GH30[D].Hefei:Institute of Solid State Physics of the Chinese Academy of Sciences,1993.