摘要
陈述了以16Mn钢紧凑拉伸试件进行的变幅加载疲劳裂纹扩展行为研究。通过改变瑞利分布随机荷载谱的高荷载比和高荷载出现频率,改变重复单峰过载谱中高载出现频率,研究了这些因素对疲劳裂纹扩展和寿命的影响。实验表明:随机加载条件下,高荷载对裂纹扩展的影响远没有单峰过载加载时大;高载比和高载出现频率是影响裂纹扩展的重要因素;在实验随机加载条件下,只有当高截比大于2.0时,高荷载才对裂纹扩展有明显的迟滞作用,高载比小于2.0时,忽略荷载相互作用仍可得到相当准确的寿命预测值。
This paper presents a study of fatigue crack growth(FCG)under variable-amplitude loading with conipact tension specimens of steel 16 Mn。 Effect of the high-load rate RHLand high load occurrenee in random loading and the periodic single peak overloading on FCG isexamined,The results show that the effect of high loads in random loading on FCG is not as great asthat in a single peak overload within constant-amplitude loading.The high load rate and occurrenceof variable-loading are imporeant faeturs affecting FCG, In the testing condition,the high loads giveapparent retardation effect on FCG for RHL>2.0.The load-interaction effect could be isnored forRHL≤2.0 and rather presise life prediction could be got by constant-amplitude loading FCG datawithout,accounting for the load-interaction。
出处
《重庆建筑大学学报》
CSCD
1995年第3期8-20,共13页
Journal of Chongqing Jianzhu University