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研究裂纹扩展的试验,一般为负荷恒定的疲劳试验,裂纹长度大部分采用读数望远镜或对每隔一定循环次数拍摄的试样表面的照片等方法进行测量。但还有利用试样的残留截面积发生变化这一点,根据声顺的变化或电阻的变化间接地得到的方法。图9为用涡流式检测器
Crack propagation tests are generally fatigue tests with a constant load. Most of the crack length is measured using a reading telescope or by photographing the surface of a specimen taken at regular cycles. However, there is also a method of using indirectly the change of the residual cross-sectional area of the sample according to the change of the sound-absorbing property or the change of the electric resistance. Figure 9 uses a vortex detector