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监测裂纹长度的交流电位法具有高精度、高灵敏度、高稳定性、简单耐用、可与函数记录仪或电子计算机配套使用等优点,在环境复杂的亚临界裂纹扩展实验中尤其能发挥其优点,具有广泛的应用前景。本文较详细地介绍了交流电位法的基本原理、工作特性和使用中应注意的事项,并进行了三点弯曲试样和楔形张开载荷试样的实验标定,以及恒载荷下液体介质促进的裂纹扩展实验。根据标定和应用的结果,讨论了初始电位的重要性和初加载时电位变化的物理意义,并提出如何解决应用中出现的问题。
The AC potential method of monitoring the crack length has the advantages of high precision, high sensitivity, high stability, simple and durable, and can be used with a function recorder or an electronic computer. In particular, the advantages of the ac subcritical crack growth experiment with complex environments are demonstrated. Has a wide range of applications. In this paper, the basic principles, working characteristics and the matters needing attention during the application of AC potential method are introduced in detail. The experimental calibration of three-point bending specimen and wedge-shaped load specimen and the promotion of liquid medium under constant load Crack propagation experiment. According to the results of calibration and application, the importance of the initial potential and the physical meaning of the potential change at the initial loading are discussed, and how to solve the problems in the application is proposed.