Wavelet Analysis of Ultrasonic Lamb Waves Excited by Pulsed Laser in a Composite Plate

1999 ◽  
pp. 695-701 ◽  
Author(s):  
Jun-Bo Han ◽  
Jian-Chun Cheng ◽  
Yves Berthelot
Keyword(s):  
Wavelet Analysis ◽  
Composite Plate ◽  
Lamb Waves ◽  
Pulsed Laser

Modes of Wave Propagation and Dispersion Relations in Inclusion Reinforced Composite Plates

2010 ◽  
Author(s):  
Yu Cheng Liu ◽  
Jin Huang Huang
Keyword(s):  
Composite Plate ◽  
Elastic Moduli ◽  
Lamb Waves ◽  
Plate Thickness ◽  
Composite Plates ◽  
Dispersion Relations ◽  
Elastic Behavior ◽  
Effective Elastic Moduli ◽  
Aspect Ratios ◽  
Reinforced Composite

This paper mainly analyzes the wave dispersion relations and associated modal pattens in the inclusion-reinforced composite plates including the effect of inclusion shapes, inclusion contents, inclusion elastic constants, and plate thickness. The shape of inclusion is modeled as spheroid that enables the composite reinforcement geometrical configurations ranging from sphere to short and continuous fiber. Using the Mori-Tanaka mean-field theory, the effective elastic moduli which are able to elucidate the effect of inclusion’s shape, stiffness, and volume fraction on the composite’s anisotropic elastic behavior can be predicted explicitly. Then, the dispersion relations and the modal patterns of Lamb waves determined from the effective elastic moduli can be obtained by using the dynamic stiffness matrix method. Numerical simulations have been given for the various inclusion types and the resulting dispersions in various wave types on the composite plate. The types (symmetric or antisymmetric) of Lamb waves in an isotropic plate can be classified according to the wave motions about the midplane of the plate. For an orthotropic composite plate, it can also be classified as either symmetric or antisymmetric waves by analyzing the dispersion curves and inspecting the calculated modal patterns. It is also found that the inclusion contents, aspect ratios and plate thickness affect propagation velocities, higher-order mode cutoff frequencies, and modal patterns.

Scattering of Lamb Waves in a Composite Plate

1991 ◽  
pp. 1507-1514 ◽  
Author(s):  
Robert Bratton ◽  
Subhendu Datta ◽  
Arvind Shah
Keyword(s):  
Composite Plate ◽  
Lamb Waves

Boundary-enhanced reconstruction algorithm for probabilistic inspection of composite plate defects with air-coupled Lamb waves

2020 ◽  
Vol 29 (3) ◽  
pp. 035019
Author(s):  
Hui Zhang ◽  
Yuzhen Liu ◽  
Xiaobo Rui ◽  
Zhuochen Wang ◽  
Lu Yu
Keyword(s):  
Composite Plate ◽  
Lamb Waves ◽  
Reconstruction Algorithm

The propagation of Lamb waves in a laminated composite plate with a variable stepped thickness

2006 ◽  
Vol 76 (4) ◽  
pp. 388-396 ◽  
Author(s):  
Jeongho Han ◽  
Chun-Gon Kim ◽  
Jung-Yub Kim
Keyword(s):  
Composite Plate ◽  
Lamb Waves ◽  
Laminated Composite ◽  
Laminated Composite Plate

Visualization of Structural Defects Based on Ultrasonic Wave Propagation Imaging Technique Using Pulsed Laser System

2013 ◽  
Vol 281 ◽  
pp. 620-623 ◽  
Author(s):  
Chang Gil Lee ◽  
Eun Seok Shin ◽  
Hyun Uk Kim ◽  
Seung Hee Park
Keyword(s):  
Lamb Waves ◽  
Imaging Technique ◽  
Laser System ◽  
Pulsed Laser ◽  
Specific Area ◽  
Piezoelectric Sensor ◽  
Wave Number ◽  
Structural Defects ◽  
Target Structure ◽  
3 Dimensional

In this study, structural defects are visualized and localized based on a noncontact nondestructive testing (NDT) method which utilizes an ND: YAG pulsed laser system. The ND: YAG pulsed laser is used to generate Lamb waves of a plate-like structure and to scan specific area of the target structure for the visualization of the structure. Wave responses are measured using only single piezoelectric sensor. The measured responses are analyzed using 3 dimensional Fourier transform. The damage-sensitive features are extracted by wave-number filtering based on the 3D FT. Then, flaw imaging technique of a plate-like structure is conducted using the damage-sensitive features. Finally, the plate with a notch is investigated to verify the effectiveness and the robustness of the proposed NDT approach.

Analysis of Second-Harmonic Generation of Low-Frequency Dilatational Lamb Waves in a Two-Layered Composite Plate

2018 ◽  
Vol 35 (11) ◽  
pp. 114302
Author(s):  
Han Chen ◽  
Ming-Xi Deng ◽  
Ning Hu ◽  
Ming-Liang Li ◽  
Guang-Jian Gao ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Composite Plate ◽  
Lamb Waves ◽  
Second Harmonic ◽  
Low Frequency ◽  
Layered Composite
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