圆柱曲界面对横波接触法周向超声检测可靠性的影响

The Impact on Reliability of Circumferential Ultrasonic Testing with Transversal Wave Contact Technique on Cylindrical Interface

在圆柱曲界面上进行横波接触法周向超声检测与平界面不同,由于曲界面的存在,对超声检测的可靠性产生影响。应用声学理论建立了圆周界面超声检测的几何模型,从理论上分析研究圆周界面对超声波耦合、声场结构、探头特征参数、面积型缺陷回波特性、缺陷定位与定量等诸多方面的影响,并针对性地加工了超声试样进行试验研究,对理论模型进行验证,提出了改善曲界面影响的对策措施,并在工程实践中取得了较好效果。

Circumferential ultrasonic testing with transversal wave contact technique on cylindrical interface is different from that on planar interface. The curved interface will make some impact on the reliability of ultrasonic testing. The authors set up a geometric model of ultrasonic testing on circular interface by acoustic theory in this paper, and analyzed the impact of circular interface on such aspeets as ultrasonic coupling, sound-field structure, parameters of probe characteristics, echo characteristic of area flaw, positioning and quantification of defect, and so on. Experimental study is also made by processing comparison samples of circular interface to validate the theoretical model. Based on this, some appropriate measures are advanced to improve the reliability of ultrasonic testing on circular interface, and these measures have achieved good results in practice.