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针对某航空发动机盘件中的径轴向裂纹,采用不同焦距的5MHz、10MHz聚焦探头和平探头,分别在0°,1°,2°,3°的声束入射角度下进行检测试验,通过对入射角度以及探头类型、频率、焦距等参数的优化,建立了径轴向裂纹的底波监控超声检测方法。研究发现:与垂直入射相比,小角度纵波斜入射底波监控超声检测方法可提高超声波对裂纹的敏感程度;使用焦距为89mm的10MHz聚焦探头,并使声束以2°入射角斜入射可得到最佳检测效果,试验结果与数值模拟具有良好的一致性。
Aiming at radial crack in an aeroengine disk, a 5MHz, 10MHz focusing probe and a flat probe with different focal lengths were used to detect the beam at 0 °, 1 °, 2 ° and 3 ° angle respectively. Angle of incidence and probe type, frequency, focal length and other parameters optimization, the establishment of a radial axial crack bottom wave monitoring ultrasonic testing method. The results show that compared with the normal incidence, the small-angle oblique wave incidence bottom wave monitoring ultrasonic testing method can improve the sensitivity of the ultrasonic wave to the crack. Using a 10 MHz focusing probe with a focal length of 89 mm, the beam can be obliquely incident at an incident angle of 2 ° Get the best detection results, the test results and numerical simulation has good consistency.