电焊机2024，Vol.54Issue(6)：13-18,6.DOI:10.7512/j.issn.1001-2303.2024.06.03
超声兰姆波在角焊缝探伤中传播衰减规律研究
Research on the Accuracy of Ultrasonic Lamb Wave based Nondestructive Testing of Fillet Welds
摘要
Abstract
Ultrasonic Lamb waves are one of the commonly used ultrasonic waves in the field of steel structure inspection and non-destructive testing,widely used because of their long propagation distance and the ability to carry overall structural information through point-to-point detection.Welded plate welds are prone to defects such as cracks due to changes in weld-ing stress and other mechanical parameters,making them difficult to detect.Therefore,the propagation mechanism of Lamb waves in the structure of welded fillet welds and the interaction between damage and Lamb waves can be studied through fi-nite element simulation.By setting up the excitation source in the piezoelectric ceramic model,the signal is emitted through the excitation source.Since the signal will be affected by some uncertain factors such as overlap and refraction during trans-mission,a method of setting up equidistant dual receiving points for signal reception is adopted.It is concluded that when the ultrasonic Lamb wave does not encounter damage in the welding angle,it propagates uniformly along the set route,fol-lowing the Lamb wave spectrum,with stable amplitude strength and period.By setting an acceptable signal,the impact of different crack depths on detection can be compared,and a rule is derived that the amplitude is directly proportional to the crack depth.The wave packet of the ultrasonic Lamb wave is stable,and its flight time can be calculated through the ampli-tude.When the depth of damage changes,the amplitude of the ultrasonic Lamb wave will increase as the depth increases,and finally tend to a maximum value,which lays a solid foundation for the study of damage location methods.关键词
超声兰姆波/缺陷/损伤/模拟仿真Key words
ultrasonic lamb wave/defects/damage/simulation分类
矿业与冶金引用本文复制引用
刘本友,谷雨,潘家敬..超声兰姆波在角焊缝探伤中传播衰减规律研究[J].电焊机,2024,54(6):13-18,6.基金项目
山东省自然科学基金(ZR2023ME201) （ZR2023ME201）
