基于非线性连续介质损伤力学方法的微动疲劳寿命预测  

Prediction of Fretting Fatigue Life Based on Nonlinear Continuum Damage Mechanics

作　　者：李爱民[1] 崔海涛[1] 温卫东[1] 石炜[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《航空学报》2013年第9期2122-2129,共8页Acta Aeronautica et Astronautica Sinica

基　　金：江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0170);中央高校基本科研业务费专项资金~~

摘　　要：微动损伤被称为"工业癌症",为了更加准确预测微动疲劳寿命,本文提出了一种基于多轴非线性连续介质损伤力学(NLCD)模型的微动疲劳寿命预测方法。该方法在Chaboche NLCD模型基础上,引入临界等效塑性应变幅对其进行改进,得到了适用于微动疲劳的NLCD改进模型,对桥式光滑试件和燕尾榫结构模拟件分别进行了微动疲劳寿命预测,与文献试验结果误差分散带在2倍因子之内,且预测裂纹萌生位置与试验吻合良好,验证了本文方法的有效性。Fretting damage is known as an ＂industrial cancer＂. In order to predict fretting fatigue life accurately, a new fret- ting fatigue life prediction method is developed which is based on the non-linear-continuous-damage （NLCD） model. The new developed NLCD model applies to the fretting fatigue life prediction, which is modified by an equivalent plastic strain ampli- tude of the critical plane based on the Chaboche NLCD model. The fretting fatigue life of bridge-type smooth specimens and dovetail joints is got by the new model. Comparing with the experimental results of the literature, all of the estimated fretting fatigue life by developed NLCD model fall within the scatter bands of ± 2N （ ± 50 % ）, and the predicted crack initiation lo- cation show good agreement with experimental results, which verifies the effectiveness of the proposed method.

关 键 词：微动疲劳 寿命预测 连续介质损伤力学 多轴疲劳 燕尾榫 钛合金 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]