关键词: 弯曲疲劳, 随机载荷, 齿轮, 正态分布

Abstract:

For the  bending fatigue under the random load conditions with normal distribution,an equivalent load was analyzed and limiting value of gear bending fatigue strength was computed based on equivalent fatigue damage.The effect of load spectrum distributed parameter on equivalent load was analyzed,and load spectrum was compiled for luffing amplitude fatigue experiments.Then experiments of gear bending fatigue strength were achieved under random load according to normal distribution on MTS electro-hydraulic servo material fatigue tester,where the group method was used.The R-S-N curve was acquired in a concrete coefficient of variation.The tests prove that bending fatigue strength of gear under random load  is less than that under constant load.By contrasting with the bending fatigue strength computed based on constant load,the theoretical results can agree with experimental ones.

Key words: bending fatigue, random load, gear, normal distribution