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Finite element simulation on the reflection and transmission of the lamb waves across a micro defect of plates
- Source :
- Journal of Vibroengineering, Vol 21, Iss 3, Pp 611-626 (2019)
- Publication Year :
- 2019
- Publisher :
- JVE International, 2019.
-
Abstract
- This paper presents a theoretical and finite element (FE) investigation of the generation and propagation characteristics of the fundamental Lamb waves symmetrical mode S0 and anti-symmetrical mode A0 after testing with different types of defects in the plates. The reflection and transmission of Lamb waves at a micro symmetry defect and asymmetry defect are analyzed numerically in the two-dimension (2D) model. Mode conversion of Lamb waves can occur upon encountering the asymmetry discontinuities leading to newly-converted modes apart from wave reflection and transmission. When testing the symmetry defects, the reflection and transmission waves have no modal separation phenomenon. To describe the mode conversion and reflection and transmission degree, and evaluate the micro defect severity, a series of defects are simulated to explore the relationships of defect reflection and transmission with the length and depth of a defect in the 2D FE model. In the three-dimension (3D) FE model, the straight-crest Lamb waves and circular-crest Lamb waves are simulated and researched by contrast analysis. Then the straight-crest Lamb waves are motivated to study the scattering laws of Lamb waves interacting with the circle hole defects and rectangular hole defects. S0 mode and SH0 mode are contained in the scattering waves after S0 mode testing the through holes defects. Corresponding mode energy percentages were analyzed at different micro defect severities changed in different ways. Simulation results illustrated that the modal energy percentages varied in a different character and provided support for the analytically determined results of Lamb waves in the non-destructive testing and evaluation.
- Subjects :
- Acoustics
media_common.quotation_subject
lcsh:Mechanical engineering and machinery
02 engineering and technology
Classification of discontinuities
01 natural sciences
Asymmetry
Lamb waves
0203 mechanical engineering
reflection and transmission
0103 physical sciences
General Materials Science
lcsh:TJ1-1570
010301 acoustics
media_common
Physics
defect detecting
Scattering
Mechanical Engineering
Mode (statistics)
Finite element method
Symmetry (physics)
020303 mechanical engineering & transports
lamb waves
finite element
energy distribution
Reflection (physics)
Subjects
Details
- Language :
- English
- ISSN :
- 25388460 and 13928716
- Volume :
- 21
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Journal of Vibroengineering
- Accession number :
- edsair.doi.dedup.....e0f9a067606bb5063085dd91488eea59