本文对４５钢光滑试样疲劳短裂纹的形成和扩展进行了试验，利用复型技术和光学显微镜观测了裂纹尺寸演化全过程．发现疲劳短裂纹形成寿命小于失效寿命的１０％．根据裂纹的扩展速度将短裂纹形成分成微观短裂纹和物理短裂纹两个阶段，给出了区分两种短裂纹的裂纹特征尺寸值和两种短裂纹的扩展速度公式
The overall evolution for initiation and propagation of the short fatigue cracks in smooth specimen of the steel 45 was observed under optical microscope by using of the replication short crack initiation life is less than 10% of the failure one. According to the cracking rate. the growth of short cracks may separate into two stages. i.e., micro-crack and physical crack, of which the characteristic values of crack size and the equations of growth rate to identify them are given.Correspondent:XU Hao,professor,(College of Mechanical Engineering, Northeastern University, Shenyang 110006)
参考文献
| [1] | 吴志学,吴小军,王德俊,徐灏．第5届全国疲劳学术会议论文集(一),威海,1991:152-1562吴志学,吴小军,王德俊,徐灏．第6届全国疲劳学术会议论文集(下),厦门,1993:552-555z |
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