中碳钢疲劳短裂纹萌生与扩展特性

Initiation/Propagation Behavior of Small Fatigue Cracks in Medium Carbon Steels

试验研究了不同热处理状态的３５￣＃钢试样表面疲劳短裂萌生与扩展特性．结果表明：微结构尺寸及其分布特性对短裂纹萌生与扩展行为有较大影响；短裂纹萌生与扩展寿命可用Ｗｅｉｂｕｌｌ分布定量描述．

The initiation/propagation behaviour of small surface fatigue cracks were investigated experimentally for # 35 steel specimens. The results showed that the microstructural size and distribution will greatly affect the initiation/propagation behavior of small cracks,and both the lives of initiation and propagation can be expressed quantitatively by Weibull's distribution.