scholarly journals Analytical and finite element prediction of Lamb wave scattering at delaminations in quasi-isotropic composite laminates

2012 ◽  
Vol 331 (22) ◽  
pp. 4870-4883 ◽  
Author(s):  
C.T. Ng ◽  
M. Veidt ◽  
L.R.F. Rose ◽  
C.H. Wang
Keyword(s):  
Finite Element ◽  
Lamb Wave ◽  
Composite Laminates ◽  
Wave Scattering ◽  
Isotropic Composite ◽  
Finite Element Prediction

Prediction and Measurement of Lamb Wave from Debondings at Structural Features in Composite Laminates

2013 ◽  
Vol 558 ◽  
pp. 139-148 ◽  
Author(s):  
Ching Tai Ng ◽  
Martin Veidt
Keyword(s):  
Lamb Wave ◽  
Composite Laminates ◽  
Wave Scattering ◽  
Three Dimensional ◽  
Scattered Wave ◽  
Structural Features ◽  
Complex Structures ◽  
Detection Techniques ◽  
Fe Simulations ◽  
Good Agreement

The interaction of the fundamental anti-symmetric Lamb wave (A0) with debondings at structural features is investigated using experimental data and finite element (FE) simulations. In this study explicit three-dimensional (3D) FE simulations are employed, which allows the study of the scattered wave along different propagation directions. Good agreement between the FE predictions and the measurements are obtained that demonstrates that the 3D FE scattering model is able to accurately predict the Lamb wave scattering characteristics at debondings. The study show that the characteristics of Lamb wave reflected from the debondings at the structure feature is much more complicated than that from defects in flat composite laminates. Parameter studies show that the backward and forward scattering coefficient of Lamb wave is a function of debonding size to wavelength ratio and debonding location. This shows the potential of employing Lamb wave to identify the size and monitor the growth of the debondings. The findings of the study provide improved physical insights into the scattering phenomena, which are important to further advance damage detection techniques for complex structures made by composite laminates.

3D finite element modeling of Lamb wave scattering from a sessile water droplet

2015 ◽  
Author(s):  
Hongye Liu ◽  
Jennifer E. Michaels ◽  
Xin Chen ◽  
Thomas E. Michaels ◽  
Cunfu He
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Lamb Wave ◽  
Water Droplet ◽  
Wave Scattering ◽  
3D Finite Element ◽  
Element Modeling ◽  
3D Finite Element Modeling

Finite element prediction of contact pressures in cam-type femoroacetabular impingement with varied alpha angles

2016 ◽  
Vol 20 (3) ◽  
pp. 294-301 ◽  
Author(s):  
Qian Liu ◽  
Wanchun Wang ◽  
Andrew R. Thoreson ◽  
Chunfeng Zhao ◽  
Weihong Zhu ◽  
...  
Keyword(s):  
Finite Element ◽  
Femoroacetabular Impingement ◽  
Contact Pressures ◽  
Finite Element Prediction
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