Interaction of guided Lamb waves with an asymmetrically located delamination in a laminated composite plate

Propagation of the primary anti-symmetric Lamb mode (Ao) in an asymmetrically delaminated cross-ply laminate has been studied through both numerical simulations and experiments employing the air coupled ultrasonic technique. When the Ao mode interacts with the entrance and the exit of an asymmetrically located delamination, in addition to Ao, a mode converted to the primary symmetric Lamb mode (So) also propagates in each of the two sub-laminates as well as the main laminate. These Lamb modes propagate independently in each of the sub-laminates. In addition, turning modes (i.e. the mode propagating in one sub-laminate interacts with delamination edge and starts propagating in the other sub-laminate) and a mode converted turning mode (a new mode is generated during the interaction of turning mode with delamination edge) were also observed in the numerical simulation. The presence of the 'mode converted turning modes' was also validated through the experiments in this study.

[1]  Dale E. Chimenti,et al.  Ultrasonic Wave Reflection From Liquid-Coupled Orthotropic Plates With Application to Fibrous Composites , 1988 .

[2]  Kazuro Kageyama,et al.  Optimal Mother Wavelet Selection for Lamb Wave Analyses , 2009 .

[3]  J. Rajagopalan,et al.  A phase reconstruction algorithm for Lamb wave based structural health monitoring of anisotropic multilayered composite plates , 2006 .

[4]  Christian Boller,et al.  Health Monitoring of Aerospace Structures , 2003 .

[5]  D. E. Chimenti,et al.  Leaky Lamb waves in fibrous composite laminates , 1985 .

[6]  S. I. Rokhlin,et al.  Coupling of Lamb waves with the aperture between two elastic sheets , 1983 .

[7]  Yiu-Wing Mai,et al.  Delamination detection in smart composite beams using Lamb waves , 2004 .

[8]  Huai Min Shang,et al.  A Strip Element Method for Analyzing Wave Scattering by a Crack in an Immersed Composite Laminate , 1999 .

[9]  K. Balasubramaniam,et al.  Interaction of the primary anti-symmetric Lamb mode (Ao) with symmetric delaminations: numerical and experimental studies , 2009 .

[10]  P. Cawley,et al.  The interaction of Lamb waves with delaminations in composite laminates , 1993 .

[11]  H. Inoue,et al.  Time Frequency Analysis of Dispersive Waves by Means of Wavelet Transform , 1995 .

[12]  Wieslaw Ostachowicz,et al.  The spectral finite element model for analysis of flexural–shear coupled wave propagation: Part 1: Laminated multilayer composite beam , 2005 .

[13]  Carlos E. S. Cesnik,et al.  Review of guided-wave structural health monitoring , 2007 .

[14]  L. Jacobs,et al.  Guided Lamb Wave Propagation in Composite Plate/Concrete Component , 2002 .

[15]  Lin Ye,et al.  Some aspects of numerical simulation for Lamb wave propagation in composite laminates , 2006 .

[16]  Vinay Dayal,et al.  Leaky Lamb waves in an anisotropic plate. I: An exact solution and experiments , 1989 .

[17]  Jan Drewes Achenbach,et al.  A Strip Element Method for Stress Analysis of Anisotropic Linearly Elastic Solids , 1994 .

[18]  Victor Giurgiutiu,et al.  Piezoelectric Wafer Embedded Active Sensors for Aging Aircraft Structural Health Monitoring , 2002 .

[19]  Fu-Kuo Chang,et al.  Manufacturing of composite structures with a built-in network of piezoceramics , 1998 .

[20]  Krishnan Balasubramaniam,et al.  Structural health monitoring of composite structures using Lamb wave tomography , 2004 .

[21]  Takahiro Hayashi,et al.  Multiple reflections of Lamb waves at a delamination. , 2002, Ultrasonics.

[22]  L. Ye,et al.  A damage identification technique for CF/EP composite laminates using distributed piezoelectric transducers , 2002 .

[23]  Krishnan Balasubramaniam,et al.  NON‐CONTACT ULTRASOUND BASED GUIDED LAMB WAVES FOR COMPOSITE STRUCTURE INSPECTION: SOME INTERESTING OBSERVATIONS , 2009 .