Abstract

Small-opening slots have been used to simulate cracks in butt welds. The influence of the orientation of the slot ribs on their detectability with pulse echo and diffraction methods of ultrasonic testing has been studied. It is shown that the processes occurring during the scattering of elastic waves on cracks should be modeled by a three-dimensional problem. However, theoretical analytical and numerical studies in this area most often concern two-dimensional problems of diffraction of elastic waves, where the target edge under study is located on the acoustic axis of the ultrasound source and/or receiver and is oriented perpendicular to the incident beam. The article presents experimental results illustrating the influence of the orientation of the edge (rib) in three-dimensional problems on the received signals both when using diffraction schemes of the TOFD type, and in classical ultrasonic testing by the pulse echo method according to the “tandem” scheme and with the transducers turned according to the “duet” scheme.

中文翻译：

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弹性波在裂纹模型上的衍射实验研究

摘要

小开口槽已用于模拟对接焊缝中的裂纹。研究了缝隙肋的取向对脉冲回波和超声测试衍射方法对其可检测性的影响。结果表明，弹性波在裂缝上的散射过程中发生的过程应该用三维问题来建模。然而，该领域的理论分析和数值研究最常涉及的是弹性波的二维问题，其中研究的目标边缘位于超声源和/或接收器的声轴上，并且垂直于入射光束。