一种新的多轴低周疲劳损伤参量  

A New Muitiaxial Fatigue Damage Parameter Under Muitiaxiai Low Cycle Loading

作　　者：孙国芹[1] 尚德广[1] 丁雷[1] 邓静[1] 贾冠华[1] 王瑞杰[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》2006年第8期688-692,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金(10172010).

摘　　要：利用轴向和周向应变幅的最大值合成一个新的等效应变幅作为多轴疲劳损伤参量，考虑不同加载路径导致轴向和周向出现的平均应力的影响，结合Manson—Coffin方程提出了一个新的损伤模型．该模型经高温GH4169合金、45^#钢、Inconel718钢和高温304不锈钢4种材料的多轴疲劳试验验证表明，寿命误差基本分散在2个因子之内．A new multiaxial fatigue damage parameter applied to maximum amplitude of axial and circular strain is presented. The parameter which reflects the effect of loading paths, is convenient for application be cause it does not have any material constants. Considering the average stress of the axial and circular stress re sponses by different loading paths, a new multiaxial fatigue life prediction model is established bv combining the multiaxial fatigue damage parameter with the Manson-Coffin equation. The errors between the predicted fatigue lives and multiaxial fatigue experimental results by testing four materials of GH4169 alloy, steel 45 and Inconel 718 steel and 304 stainless steel are within 2 factors.

关 键 词：低周 疲劳 寿命 预测 多轴 等效应变 

分 类 号：O346.2[理学—固体力学]