摘要
本文研究了随机谱加载、程序谱加载和均方根载荷加载的实验和疲劳裂纹扩展寿命估算.从实验和理论计算结果表明:对飞机谱载荷,程序谱加载,均方根载荷加载的疲劳裂纹扩展寿命皆比随机谱加载的寿命长.如果将程序谱的周期长度(一个程序周期的循环数)减50%,则所得的裂纹扩展寿命趋近于随机谱加载的寿命.
The life expectancy of crack propagation due to (?)atigue for c(?)ack
specimens which are subjected to random spectrum loading,block-programmed
loading and root-mean-square loading have been under research.The expe-
rimental and theoretical results show that for the flight spectrum the life of
fatigue crack propagation of block-programmed loading or root-mean-square
loading is longer than that of random spectrum loading.If the block size is
reduced by half,the propagation life of block-programmed loading in fatigue
is approaching that of random spectrum loading.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1990年第5期178-185,共8页
Journal of Shanghai Jiaotong University
关键词
疲劳裂纹
载荷
裂纹扩展寿命
random spectrum
programmed spectrum
rain-flow-cycle counting method
root-mean-square looding
