摘要
基于多轴疲劳临界损伤面原理,在对GH4169合金薄壁圆管和缺口试件的高温疲劳特性及有限元应力-应变关系进行分析的基础上,通过引入三轴因子FT,应用von-Mises准则提出了一个能够适用于GH4169合金不同应力状态的多轴疲劳损伤参量。新的损伤参量考虑了临界面上最大剪应变和法向应变对多轴疲劳损伤的不同以及应力状态对多轴疲劳寿命的影响。该多轴疲劳损伤参量不含有经验常数,便于工程应用。利用新的多轴疲劳损伤参量,结合Man-son-Coffin方程,建立了新的多轴疲劳寿命预测模型。预测结果表明,该模型较准确地预测了GH4169合金薄壁圆管和缺口试件的高温多轴疲劳寿命。
With the analysis of the multiaxial fatigue behavior of the thin wall specimens and notched specimens of GH4169 alloy as well as the state of the stress -strain by using the Finite Element Method （FEM）, a new damage parameter for multi - axial fatigue is proposed by means of von- Mises criterion based on the critical plane approach. In the new damage parameter, the triaxial factor is introduced. For the new damage parameter, the maximum shear strain and normal strain on the critical plane are taken into account, and the effect of stress state under the multiaxial cyclic loading condition on the fatigue life is taken into account as well. This parameter without con- taining empirical constants is easy and convenient for engineering application. By combining the proposed damage parameter with the Manson - Coffin equation, the fatigue life prediction model is established. And the experimental verifications show that the new fatigue life prediction model is more accurate in predicting the high temperature multiaxial fatigue life of the thin wall specimens and the notched specimens.
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2009年第4期85-89,共5页
Journal of Air Force Engineering University(Natural Science Edition)
基金
空军工程大学理学院学位论文创新基金资助项目(2007S001)
