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为了适应比较恶劣的疲劳裂纹检测环境,如工件表面附有涂层或者附有腐蚀残留物的情况,提出了一种基于电磁检测原理的疲劳裂纹检测方法。该方法中采用自激振荡激励原理和两路信号处理方式。对带有人工缺陷的45#钢试样的检测结果表明,与常规方法相比,在相同的条件下灵敏度可以提高3 dB以上,提离效应得到了抑制。用该方法可检测出0.8mm涂层下深度为0.1mm的人工表面裂纹缺陷。
In order to adapt to the harsh fatigue crack detection environment, such as the workpiece surface with a coating or attached to the case of corrosion residues, a detection method based on the principle of electromagnetic fatigue crack detection. The method uses self-excited oscillation excitation principle and two signal processing methods. The test results of 45 # steel with artificial defects show that compared with the conventional method, the sensitivity can be increased by more than 3 dB and the lift-off effect can be suppressed under the same conditions. This method can be used to detect artificial surface crack defects with a depth of 0.1 mm under a 0.8 mm coating.