超声相控阵探头楔块优化及其在锚具检测中的应用

锚具作为缆索体系桥梁中的关键传力构件,其产品质量是整个桥梁运行安全性的保证。由于锚具的制造工艺,超声检测是锚具内部缺陷检测的主要手段,超声相控阵方法由于声束偏转、动态聚焦、程序控制等优点,比超声检测具有更高的检测效率及缺陷检出率。将超声相控阵方法应用于锚具无损检测中,优化探头楔块与锚具的接触形式,采用圆弧形接触面来改善耦合效果。通过对比试块的检测增益值分析探头楔块优化对检测灵敏度的影响,并分析了探头楔块曲率与对比试块曲率相同时,缺陷大小、缺陷深度对超声相控阵检测结果的影响。

Optimization of Probe Wedge for Ultrasonic Phased Array Method and its Application in Anchorage Detection

Anchorage is key stress transmission part for bridges with cable system which can ensure the safety of bridge.Due to its manufacture technique,the ultrasonic testing is the common method of anchorage internal defect,and ultrasonic phased array has better efficiency and accuracy by the advantages of beam deflection,dynamic focusing and program control compared with ultrasonic detection.The ultrasonic phased array method is applied to the nondestructive testing of anchorage and circular arc surface is used to improve the coupling effect between probe and anchorage.Detection gain of ultrasonic phased array is used to analyze the influence of surface curvature change of the probe wedge on detection sensitivity.And the interference of defect size and depth with the ultrasonic phased array detection is also investigated while the surface curvature of probe wedge and reference block is the same.