A537钢室温与低温下疲劳裂纹扩展的基本控制参数优选

在研究海洋石油平台结构用钢Ａ５３７在室温与低温下疲劳裂纹扩展规律的基础上，用三个不同的控制多数对疲劳裂纹扩展寿命进行了估算，并以计算寿命与试验寿命差值之大小作为衡量标准，优选出各个温度下疲劳裂纹扩展的基本控制参数．研究结果表明，Ａ５３７钢室温疲劳裂纹扩展的基本控制参数为应力强度因子幅值，而低温疲劳裂纹扩展的基本控制参数则为最大Ｊ积分．

OPTIMIZATION OF FUNDAMENTAL CONTROLLING PARAMETERS FOR FATIGUE CRACK PROPAGATION OF STEEL A537 UNDERR ROOM AND LOW TEMPERATURES

Based uppon the research of fatigue crack propagation law of steeI A537 usedfor offshore petroleum platform structures under room and low temperature,the fatigueerack propagation life estimation was carried out by using three different controlling parame-ters. Taking the magnitude of valtie difference between fatigue life calculating and experi-mental results as the judge standard,the fundamental controlling parameters of fatigue crackpropagation under each temperatures are optimized.The result shows that the stress intens-ty factor range is the fundamental controlling parameter of fatigne crack propagation of steelA537 under room temperature. But under low temperature the fundamental parameter of fa-tigue crack propagation is the maximum J integral.