LIU Benyou, GU Yu, PAN Jiajing.Research on the Accuracy of Ultrasonic Lamb Wave based Nondestructive Testing of Fillet Welds[J].Electric Welding Machine, 2024, 54(6): 13-18.
LIU Benyou, GU Yu, PAN Jiajing.Research on the Accuracy of Ultrasonic Lamb Wave based Nondestructive Testing of Fillet Welds[J].Electric Welding Machine, 2024, 54(6): 13-18. DOI: 10.7512/j.issn.1001-2303.2024.06.03.
Research on the Accuracy of Ultrasonic Lamb Wave based Nondestructive Testing of Fillet Welds
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 welding 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 finite 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 transmission
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
following 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 amplitude. 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
Keywords
ultrasonic lamb wavedefectsdamagesimulation
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