航空学报 > 2002, Vol. 23 Issue (2): 97-101

轴对称构件疲劳寿命预测的损伤力学—附加载荷—有限元法

唐雪松1,2, 杨继运1, 蒋持平1, 张行1   

  1. 1. 北京航空航天大学飞行器设计与应用力学系, 北京 100083;2. 长沙交通学院桥梁与结构工程系, 湖南长沙 410076
  • 收稿日期:2001-03-05 修回日期:2001-07-02 出版日期:2002-04-25 发布日期:2002-04-25

DAMAGE MECHANICS—ADDITIONAL LOAD—FINITE ELEMENT METHOD FOR FATIGUE LIFE PREDICTION OF AXISYMMETRICAL STRUCTURAL MEMBERS

TANG Xue-song1,2, YANG Ji-yun1, JIANG Chi-ping1, ZHANG Xing1   

  1. 1. Department of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronatics and Astronatics, Beijing 100083, China;2. Department of Bridge and Structure Engineering, Changsha Communicatio ns U niver sity, Changsha 410076, China
  • Received:2001-03-05 Revised:2001-07-02 Online:2002-04-25 Published:2002-04-25

摘要:

提出了一种实用有效的弹塑性损伤应力 -应变本构方程与损伤演化方程。针对中高周疲劳问题,发展了轴对称疲劳寿命预测的损伤力学 -附加载荷 -有限元法计算格式。通过引入塑性附加载荷,考虑了构件应力集中区域塑性变形对构件疲劳寿命的影响。预估了30 Cr Mn Si Ni2A材料含沟槽轴对称试件的疲劳裂纹形成寿命,并分析了疲劳裂纹的扩展情况。疲劳寿命理论预测结果与实验结果吻合良好。

关键词: 损伤力学, 有限元, 疲劳, 轴对称, 附加载荷法

Abstract:

The practical and effective expressions of stress strain constitutive relation and damage evolution for elastoplastic damage problems are proposed. For the intermediate and high cycle fatigue problems, a damage mechanics additional load finite element method is developed. By introducing the plastic additional loads, the influence of plasticity in the area of stress concentration on the fatigue life of the specimen is considered. The fatigue crack initiation lives for notched bar specimens of 30CrMnSiNi2A material, as well as the fatigue crack propagation, are calculated. The theoretical results by the present theory are in good agreement with the experimental results. It shows that the present method has important and practical values.

Key words: damage mechanics, finite element method, fatigue, axisymmetry, additional load method