多轴块载加载下疲劳损伤累积方法研究  

STUDY ON METHOD OF FATIGUE DAMAGE ACCUMULATION UNDER MULTIAXIAL BLOCK LOADING

作　　者：徐姣[1] 尚德广[1] 陈宏[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,北京100124

出　　处：《机械强度》2012年第6期875-880,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(50975005;51010006);北京市自然科学基金资助项目(3092003);北京市教育委员会科技计划重点项目(KZ201010005003)资助~~

摘　　要：利用剪切型多轴疲劳损伤模型计算疲劳损伤,将其与Miner定理、损伤曲线法以及多轴非线性连续疲劳损伤累积模型结合,分别对钛合金BT9和GH4169合金的块载加载进行疲劳寿命预测,均得到较好的预测结果。通过对比发现,对于钛合金块载加载,Miner定理给出较好的疲劳损伤预测值,对于GH4169合金块载加载,损伤曲线法给出较好的疲劳损伤预测值。Shear strain-based multiaxial fatigue damage model was used to calculate fatigue damage. And, the shear strain- based multiaxial fatigue damage model in combination with three commonly used fatigue damage accumulation rules namely linear damage rule, damage curve approach and nonlinear continues damage cumulative model for muhiaxial fatigue are used to predict fatigue life for titanium alloy BT9 and GH4169 superalloy under multiaxial block loading, the results showed a good agreement with experiment life. Through comparison of predicting fatigue damage, the results obtained showed that among these three damage accumulation rules linear damage rule gives the best agreement with the experimental results for titanium alloy BT9 under block loading and damage curve approach gives the best agreement with the experimental results for GH4169 superalloy under block loading.

关 键 词：多轴 块载 疲劳 损伤累积模型 寿命预测 

分 类 号：O346.2[理学—固体力学] TH114[理学—力学]