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首页> 外文期刊>Journal of Nondestructive Evaluation >Ultrasonic Self-Focusing on the Edge of a Surface-Breaking Crack: Experiment and Modeling
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Ultrasonic Self-Focusing on the Edge of a Surface-Breaking Crack: Experiment and Modeling

机译：超声波自聚焦在表面破裂的裂缝边缘：实验和建模

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摘要

An adaptive time-delay self-focusing technique has been used to focus ultrasound on the edge (tip) of a surface-breaking crack emanating from the opposite side of a plate. The diffraction of the focused signal has been measured with the array. Simulation of the self-focusing process and the diffraction by the crack edge has been carried out to obtain numerical results for the edge diffraction. Ray tracing has been used to determine the incident wave field in the plate. Comparisons between the numerical results and the measured data show good agreement. The results have been used to determine the depth of the crack.
机译：自适应时延自聚焦技术已经过去，将超声波聚焦在从板的相对侧发出的表面破裂裂纹的边缘（尖端）上。 通过阵列测量聚焦信号的衍射。 已经进行了自对焦过程的仿真和裂缝边缘的衍射，以获得边缘衍射的数值结果。 射线跟踪已被用于确定板中的入射波场。 数值结果与测量数据之间的比较显示良好的一致性。 结果已被用于确定裂缝的深度。

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