Through the examination experiment on three tube pieces' crackpart, the relation of crack width, the maximum of leak magnetic field and differential coefficient is found out.
通过对三个管件的裂纹部位的检测实验，找出裂纹宽度与漏磁场的最大值和变化梯度之间的关系。
2
Through the examination experiment on four tube pieces crackpart, the relation of crack width, the maximum of leaking magnetic field and differential coefficient K is found out.
Through a fatigue life experiment on a sampling part, and with a thereafter algorithm, the different effectiveness are determined between the empty stop-crack holes and riveted stop-crack holes.