摘要
检测工件近表面缺陷时,由于超声TOFD检测直通波和缺陷端点衍射纵波发生混叠,难以准确读取二者传播时差,制约缺陷定位检测。模式转换波法基于TOFD的B扫查图像,利用传播声时较长的衍射横波,与直通波分离,实现近表面缺陷定量。对厚度20 mm和10 mm铝合金板开展检测试验,试验结果与仿真结果有较好一致性,缺陷深度定量误差不超过3.3%,验证方法有效性。
When detecting near-surface defects of the workpiece,it is difficult to accurately read the propagation time difference between the direct wave and the diffracted longitudinal wave at the end of the defect due to their aliasing effect during ultrasonic TOFD inspection,thus restricts defect positioning.The mode-converted wave method proposed in this paper is based on the TOFD B-scan image,and uses the diffracted shear wave with longer propagation time for separation from the direct wave and achieve near-surface defect quantification.This study carries out inspection on aluminium alloy plate with the thickness of 20mm and 10mm,and the inspection results are in good consistent with the simulation results,with the quantitative error of the defect depth less than 3.3%,which verifies effectiveness of the proposed method.
作者
刘立群
孙远霞
Liu Liqun;Sun Yuanxia
出处
《一重技术》
2024年第6期38-42,3,共6页
CFHI Technology
关键词
超声检测
衍射时差法
盲区
模式转换波
定量检测
Ultrasonic inspection
diffraction time difference method
blind zone
mode-converted wave
quantitative detection
