航空学报 > 1991, Vol. 12 Issue (1): 80-82

局部应力应变法弯扭复合疲劳损伤准则

聂宏, 乔新, 樊蔚勋   

  1. 南京航空学院
  • 收稿日期:1988-11-30 修回日期:1990-05-20 出版日期:1991-01-25 发布日期:1991-01-25

A CRITERION OF FATIGUE DAMAGE FOR COMBINED BENDING AND TORSION BASED ON LOCAL STRESS-STRAIN METHOD

Nie Hong, Qiao Xin, Fan Weixun   

  1. Nanjing Aeronautical Institute
  • Received:1988-11-30 Revised:1990-05-20 Online:1991-01-25 Published:1991-01-25

摘要: <正> 关于弯扭复合疲劳强度问题的研究,以往都是建立在名义应力法的基础上而局部应力应变法是一种比名义应力法更好的疲劳寿命计算方法,尤其是对于解决中、低周疲劳寿命问题。因此,本文把局部应力应变法引入弯扭复合疲劳寿命计算中,建立一个基于局部应力应变法的弯扭复合疲劳损伤准则。

关键词: 疲劳寿命, 弯扭, 损伤准则

Abstract: A criterion of fatigue damage for combined bending and torsion based on local stress-strain method is presented and a formula for local equivalent stress eq (i. e. stress strength) at notch root of notched structures is derived. It is pointed out that the structures will contain the same fatigue damage if only their local equivalent stresses are equal. Therefore, the fatigue life of a notched structure under combined bending and torsion can be predicted based on only a simple bending stress-life curve obtained from smooth specimens.

Key words: fatigue .life, bending and torsion, damage criterion