Finite Element Modeling of Lamb Waves Propagation in a Variable Thickness Plate

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Mohammadi Nasim; YAGHOOTIAN AMIN; VALIPOUR ALI

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Journal: Non-Destructive Testing Technology Year:2020 | Volume:2 | Issue:6 Page(s): 2-11

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Title

Finite Element Modeling of Lamb Waves Propagation in a Variable Thickness Plate

Author(s)

Mohammadi Nasim | YAGHOOTIAN AMIN | VALIPOUR ALI | Issue Writer Certificate

Keywords

Lamb waves

FEM

Erosion

Transmission and Reflection coefficients

Abstract

Pipelines are very important in the oil and gas industries and due to their high cost of construction, they are considered as a national asset in Iran. Erosion is known to be one of the most important pipelines damages that leads to the reduction of pipe thickness. Reduction in thickness causes more stress to be concentrated in the pipelines and failure occurs more easily. Ultrasonic tests are one of the methods used to inspect pipelines. Among various ultrasonic testing techniques, Lamb waves have a special place due to their low attenuation. However, the complex behavior of these waves in structures of variable thickness makes it difficult to interpret the data obtained from a test. In this paper, two-dimensional finite element modeling of the behavior of these waves is carried out and the Transmission and Reflection coefficients in the presence of thickness variations are verified. The results of the study of the effect of changing the Erosion depth on the transmitting and reflecting signals indicate that by using Lamb waves, changes in the thickness of a pipe can be monitored. Moreover, the study of changes in the frequency of the signal sent to the plate shows that in some frequency ranges, the S0 mode shows little sensitivity to changes in thickness. Therefore, the choice of the test frequency in Lamb waves testing is an important step in determining the condition of the structure.

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APA: Copy

Mohammadi, Nasim, YAGHOOTIAN, AMIN, & VALIPOUR, ALI. (2020). Finite Element Modeling of Lamb Waves Propagation in a Variable Thickness Plate. NONDESTRUCTIVE TESTING TECHNOLOGY, 2(6 ), 2-11. SID. https://sid.ir/paper/371485/en

Vancouver: Copy

Mohammadi Nasim, YAGHOOTIAN AMIN, VALIPOUR ALI. Finite Element Modeling of Lamb Waves Propagation in a Variable Thickness Plate. NONDESTRUCTIVE TESTING TECHNOLOGY[Internet]. 2020;2(6 ):2-11. Available from: https://sid.ir/paper/371485/en

IEEE: Copy

Nasim Mohammadi, AMIN YAGHOOTIAN, and ALI VALIPOUR, “Finite Element Modeling of Lamb Waves Propagation in a Variable Thickness Plate,” NONDESTRUCTIVE TESTING TECHNOLOGY, vol. 2, no. 6 , pp. 2–11, 2020, [Online]. Available: https://sid.ir/paper/371485/en

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