• CN:11-2187/TH
  • ISSN:0577-6686

›› 1996, Vol. 32 ›› Issue (3): 15-19,2.

• 论文 • 上一篇    下一篇

疲劳载荷谱编制方法的统一

平安;王德俊;徐灏   

  1. 东北大学
  • 发布日期:1996-05-01

UNITY FOR CONSTRUCTING FATIGUE LOADING SPECTRA

Ping An;Wang Dejun;Xu Hao   

  1. Northeastern University
  • Published:1996-05-01

摘要: 分析了载荷谱形成载荷历程及决定材料损伤程度的局部应力、应变与决定裂纹扩展速率的裂纹张开应力变化过程。提出了代表载荷历程损伤单元的固有周期谱块的概念。理论与试验证明各种疲劳谱具有统一的固有周期谱块,它们对零部件产生的损伤差异不会是通常人们认为的那么大。

关键词: 裂纹闭合, 疲劳, 损伤, 载荷谱, 高速动车组 滚动接触疲劳 曲线通过 安定图 损伤函数

Abstract: These were analysed the varying processes of the local stress-strain and the crack opening stress which determine respectively amount of damage and crack propagation rate after loading spectrum was transformed into load-time course. They vary at a instrinsic periodicity. A concept of intrinsic periodic spectrum block was put out, which represents a damage element of load-time course. Various fatigue spectra were analysed further so that it was found that they are of united intrinsic periodic spectrum block. Thus the damage differences which various fatigue spectra produce to a component are not so big as people consider usually. It was still verified by the theoretic analysis tests.

Key words: Crack closure, Damage, Fatigue, Loading spectrum, High-speed EMU Rolling contact fatigue Curving Shakedown map, Tγ model