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首先介绍了直流电位法——裂纹扩展片检测裂纹的方法和原理。根据直流电位法原理，采用裂纹扩展片测试裂纹的方法，研制了表面疲裂纹监测系统。通过监测系统软件设计，实现对采样数据、波形和图形进行实时屏幕显示，对表面疲劳裂纹扩展进行动态监视。对于不同应力水平作用下的循环时间可计时累加并再现，可为疲劳裂纹形成寿命的预测提供依据。
First of all, the method and principle of DC potential method - Crack propagation film to detect cracks are introduced. According to the theory of direct current potential method, the method of testing the crack by crack extension was used to develop a surface fatigue crack monitoring system. By monitoring the system software design, real-time screen display of sampling data, waveform and graphics can be performed to dynamically monitor the surface fatigue crack growth. For different stress levels under the action of the cycle time can be timed and reproduced, can provide a basis for fatigue crack formation life prediction.