Damage Identification and Assessment Using Lamb Wave Propagation Parameters and Material Damping in FRP Composite Laminates

The wave propagation in arbitrary anisotropic laminates is investigated on the basis of an exact theory. The dispersion relations of Lamb waves are determined for graphite/epoxy symmetric angle-ply laminates and hybrid composite ones which consist of carbon/epoxy and glass/epoxy layers. The dispersion and anisotropy of phase velocities for fundamental modes are discussed in detail. The energy distributions in the thickness direction of laminates are calculated for each kind of Lamb wave. A hybrid composite laminate is found to have better capability in absorbing impact energy by analyzing the strain energy distribution during the wave propagation. The results of the strain energy distribution are useful in determining the arrangement and the fiber orientation of the layers of hybrid composite laminates.

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Structural damage detection using combined finite-element and model Lamb wave propagation parameters

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1124 ◽

2008 ◽

Vol 223 (3) ◽

pp. 769-777 ◽

Cited By ~ 8

Author(s):

C Ratnam ◽

B S Ben ◽

B A Ben

Keyword(s):

Finite Element ◽

Wave Propagation ◽

Lamb Wave ◽

Structural Damage ◽

Pulse Generator ◽

Ultrasonic Pulse ◽

Element Analysis ◽

Propagation Parameters ◽

Set Up ◽

Lamb Wave Propagation

This article presents a combined finite-element and model Lamb wave propagation parameters method for structural health monitoring. Modal analysis allows identifying the mode conversions induced by the defects. A simulation combining a planar, lossless finite-element analysis with Lamb wave propagation parameter is proposed. This analysis is performed on two aluminium bars in both undamaged and damaged states, where the two damaged states are: (a) one having a circular hole and (b) the other having a cut partway through the bar, perpendicular to the long axis of the bar. The Lamb wave propagation parameters are calibrated by using the ultrasonic pulse generator test set-up. The natural frequencies for the theoretical, finite element and experimental results are compared, and close agreement is found between the frequencies obtained experimentally and computationally.

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Ultrasonic based structural damage detection using combined finite element and model Lamb wave propagation parameters in composite materials

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-012-4613-2 ◽

2012 ◽

Vol 67 (5-8) ◽

pp. 1847-1856 ◽

Cited By ~ 15

Author(s):

B. S. Ben ◽

S. H. Yang ◽

Ch. Ratnam ◽

B. A. Ben

Keyword(s):

Finite Element ◽

Wave Propagation ◽

Composite Materials ◽

Damage Detection ◽

Lamb Wave ◽

Structural Damage ◽

Structural Damage Detection ◽

Propagation Parameters ◽

Lamb Wave Propagation

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Lamb wave propagation in composite laminates and its relationship with acousto-ultrasonics

NDT & E International ◽

10.1016/0963-8695(93)90257-u ◽

1993 ◽

Vol 26 (2) ◽

pp. 75-84 ◽

Cited By ~ 25

Author(s):

N. Guo ◽

P. Cawley

Keyword(s):

Wave Propagation ◽

Lamb Wave ◽

Composite Laminates ◽

Lamb Wave Propagation

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Impact of Changing Temperature on Lamb Wave Propagation for Damage Detection

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.588.140 ◽

2013 ◽

Vol 588 ◽

pp. 140-148 ◽

Cited By ~ 2

Author(s):

Rafal Radecki ◽

Wieslaw Jerzy Staszewski ◽

Tadeusz Uhl

Keyword(s):

Wave Propagation ◽

Damage Detection ◽

Lamb Wave ◽

Structural Damage ◽

Clustering Algorithm ◽

Lamb Waves ◽

Ultrasonic Waves ◽

Effect Of Temperature ◽

Propagation Parameters ◽

Lamb Wave Propagation

Lamb waves are the most widely used guided ultrasonic waves for structural damage detection. One of the major problems associate with Lamb wave propagation is the effect of temperature on wave propagation parameters. It is important that these parameters are more sensitive to damage than to varying temperature. The paper demonstrates how amplitude and arrival time of Lamb waves are affected by temperature. The analysis is performed for the experimental data gathered from Lamb wave propagation in a damaged aluminium plate. A simple clustering algorithm is used to distinguish between "undamaged" and "damaged" conditions in the presence of changing temperature.

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