加载载荷对ADB610钢疲劳裂纹扩展性能的影响研究

详细信息

Effect of Load on Fatigue Crack Growth of ADB610 Steel

College of Mechanical and Electrical Engineering, Yunnan Agricultural University, Kunming 650201, China

摘要: 针对ADB610新型低碳贝氏体钢，采取紧凑拉伸试样、恒幅加载方式，在应力比为0.1时进行3种不同加载载荷下多试样的疲劳裂纹扩展试验，并测出裂纹扩展长度a和循环寿命N的a-N试验数据。然后采取七点递增多项式法对a-N试验数据拟合计算疲劳裂纹扩展速率。结果表明，加载载荷较小时，ADB610钢循环寿命较长；在疲劳裂纹扩展的初始阶段，加载载荷小的疲劳裂纹扩展速率相对较慢，但随着疲劳裂纹逐渐扩展，加载载荷小的疲劳裂纹扩展速率反而更大一些。
- ADB610钢 /
- 加载载荷 /
- 疲劳裂纹扩展
Abstract: Under the stress ratio of 0.1, 3 different loads were constantly loaded on 3 groups of compact tension specimens of ADB610 low carbon bainite steel to study the growing of the fatigue crack. The a-N test data of crack length a and the cycle life N were obtained from the tests, and the fatigue crack growth rate was calculated by fitting the a-N test data with the seven point fitting method. The resuts showed that when the load was low, the cycle fatingue life was long; in the first phase of growth of fatigue crack, the fatigue crack growth rate of the low-load was relatively low, however, with the fatigue crack developing gradually, the rate of low-load fatigue crack growth would be the higest.
- ADB610 steel /
- load /
- fatigue crack growth