航空学报 > 2013, Vol. 34 Issue (9): 2122-2129   doi: 10.7527/S1000-6893.2013.0077

基于非线性连续介质损伤力学方法的微动疲劳寿命预测

李爱民, 崔海涛, 温卫东, 石炜   

  1. 南京航空航天大学 能源与动力学院, 江苏 南京 210016
  • 收稿日期:2012-11-27 修回日期:2013-01-23 出版日期:2013-09-25 发布日期:2013-02-18
  • 通讯作者: 崔海涛,Tel.:025-84890126 E-mail:cuiht@nuaa.edu.cn E-mail:cuiht@nuaa.edu.cn
  • 作者简介:李爱民 男, 博士研究生。主要研究方向: 结构强度及微动疲劳性能。Tel: 025-84892200-2206 E-mail: liamnuaa@163.com;崔海涛 男, 博士, 教授, 博士生导师。主要研究方向: 结构疲劳寿命预测、复合材料结构损伤破坏分析、高温材料与结构的损伤机理。Tel: 025-84890126 E-mail: cuiht@nuaa.edu.cn;温卫东 男, 博士, 教授, 博士生导师。主要研究方向: 复合材料结构损伤与寿命分析, 结构优化设计与可靠性设计, 金属间化合物强度理论。Tel: 025-84892251 E-mail: gswwd@nuaa.edu.cn
  • 基金资助:

    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

Prediction of Fretting Fatigue Life Based on Nonlinear Continuum Damage Mechanics

LI Aimin, CUI Haitao, WEN Weidong, SHI Wei   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2012-11-27 Revised:2013-01-23 Online:2013-09-25 Published:2013-02-18
  • Supported by:

    Funding of Jiangsu Innovation Program for Graduate Education (CXZZ12_0170);Fundamental Research Funds for the Central Universities

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。

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

Abstract:

Fretting damage is known as an "industrial cancer". In order to predict fretting fatigue life accurately, a new fretting 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 amplitude 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 location show good agreement with experimental results, which verifies the effectiveness of the proposed method.

Key words: fretting fatigue, life prediction, continuum damage mechanics, multi-axial fatigue, dovetail joint, titanium alloy

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