基于临界面法的多轴低周疲劳损伤参量  

Multiaxial Damage Parameter Based on Critical Plane Approach for Low Cycle Fatigue

作　　者：孙国芹[1] 尚德广[1] 邓静[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100022

出　　处：《北京工业大学学报》2008年第4期337-340,共4页Journal of Beijing University of Technology

基　　金：国家自然科学基金(10172010);北京市属市管高等学校人才强教计划资助项目;北京工业大学校青基金

摘　　要：为了更简便地预测多轴低周疲劳寿命，通过分析裂纹扩展特点和最大剪应变面上的最大剪应变和相应的法向应变变化特点，提出以最大剪应变平面作为损伤临界平面，将最大剪应变和相应的法向应变作为基本的多轴疲劳损伤参数，建立了基于临界面法的多轴低周疲劳损伤参量．对GH4169合金和45^#钢的寿命预测结果表明。该损伤模型误差基本在2个因子之内．To predict life of multiaxial low cycle fatigue more conveniently, a multiaxial low cycle fatigue damage parameter is proposed based on the crack extension characteristics and changes of the maximum shear strain and the corresponding normal strain on the maximum shear stain plane and the maximum shear strain plane is considered as the critical plane. The maximum shear strain and corresponding normal strain are selected as the basic damage parameters for low fatigue. The life prediction is proceeded by using the model with GH4169 alloy and 45 steel. The results showed that the error between life prediction and experimental results is basically within 2 factors.

关 键 词：临界面法 多轴 低周 疲劳寿命 

分 类 号：O346.2[理学—固体力学]