航空学报 > 1991, Vol. 12 Issue (4): 191-194

计算缺口局部应力应变的能量法和低周疲劳寿命预测

吴永礼   

  1. 中国科学院力学研究所
  • 收稿日期:1989-06-01 修回日期:1989-09-05 出版日期:1991-04-25 发布日期:1991-04-25

ENERGY METHOD FOR CALCULATING LOCAL STRESS AND STRAIN AT A NOTCH ROOT AND PREDICTION OF LOW CYCLE FATIGUE LIFE

Wu Yongli   

  1. Institute of Mechanics Chinese Academy of Science
  • Received:1989-06-01 Revised:1989-09-05 Online:1991-04-25 Published:1991-04-25

关键词: 能量法, 低周疲劳, 寿命预测

Abstract: The local stress-strain approach has been widely used to predict the low-cycle fatigue life for notched members. The life prediction using this approach requires the local stress and strain at a notch root. The elastic-plastic finite element method can be used to obtain the local stress and strain.But it requires complex computer program. Neuber's rule is a simple and commonly used method. Some papers have shown that Neuber'rule is generally more conservative than the corresponding finite element analysis. In this paper the energy method for calculating the local stress and strain at a notch root is presented. Based on the deformation theory of plasticity, it has been generalized to the plane strain condition. Numerical examples show that the fatigue life predicted by the local stress strain using the energy method agrees favourably with the experimental results.

Key words: energy method, low cycle fatigue, life prediction