Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing

SUMMARY Two aircraft wings made of carbon fiber-reinforced plastic material were inspected using the laser-based ultrasonic propagation imaging system for the visualization of manufacturing defect and damages of debonding mode. Hypotheses of the detection mechanism of composite debonding were presented and validated through the inspection results for the bonding lines of the composite wing structures. The inspection showed that the location, shape, and size of the poor bonding defect, artificial stringer tip debonding, and real skin–spar debonding can be visualized and/or measured from the imaging results. The performance of the imaging system was found better than that of a manual ultrasonic C-scan in terms of spatial resolution and damage detectability. Another finding from the inspection was the occurrence of skin buckling between two riveted locations. Most importantly, the presence of structural elements or features such as spars, stringers, ribs, lugs, inspection windows, and even embedded PZT elements did not adversely affect the inspection. Copyright © 2012 John Wiley & Sons, Ltd.

[1]  Bernd Köhler,et al.  Dispersion Relations in Plate Structures Studied with a Scanning Laser Vibrometer , 2006 .

[2]  Alexey K. Kromin,et al.  Imaging of damage in sandwich composite structures using a scanning laser source technique , 2004 .

[3]  J. Scales,et al.  Laser characterization of ultrasonic wave propagation in random media. , 2003, Physical review. E, Statistical, nonlinear, and soft matter physics.

[4]  A. Maslouhi,et al.  Fatigue crack growth monitoring in aluminum using acoustic emission and acousto‐ultrasonic methods , 2011 .

[5]  B. S. Wong,et al.  Experimental evaluation of delaminations in composite plates by the use of Lamb waves , 1995 .

[6]  K. T. Gahagan,et al.  Measurement of shock wave rise times in metal thin films. , 2000, Physical review letters.

[7]  Paul D. Wilcox,et al.  Autofocusing ultrasonic imagery for non-destructive testing and evaluation of specimens with complicated geometries , 2010 .

[8]  Jung-Ryul Lee,et al.  Laser ultrasonic propagation imaging method in the frequency domain based on wavelet transformation , 2011 .

[9]  D. Hutchins,et al.  Lamb wave tomography of advanced composite laminates containing damage , 1994 .

[10]  R. E. Green.  THE IMPORTANCE OF IMAGING IN NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS , 2004 .

[11]  Joseph L. Rose,et al.  A Baseline and Vision of Ultrasonic Guided Wave Inspection Potential , 2002 .

[12]  M. H. Rosli,et al.  Non-contact ultrasonic detection of angled surface defects , 2011 .

[13]  P. Wilcox,et al.  Effects of array transducer inconsistencies on total focusing method imaging performance , 2011 .

[14]  Thomas Ullmann,et al.  In-Line Quality Assurance for the Manufacturing of Carbon Fiber Reinforced Aircraft Structures , 2010 .

[15]  Richard J. Dewhurst,et al.  A non-contact scanning system for laser ultrasonic defect imaging , 1991 .

[16]  L. Ye,et al.  Functionalized composite structures for new generation airframes: a review , 2005 .

[17]  Jung-Ryul Lee,et al.  Application of ultrasonic wave propagation imaging method to automatic damage visualization of nuclear power plant pipeline , 2010 .

[18]  Jung-Ryul Lee,et al.  Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Algorithm , 2012 .

[19]  P. Wilcox,et al.  Evaluation of the damage detection capability of a sparse-array guided-wave SHM system applied to a complex structure under varying thermal conditions , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[20]  Joseph L. Rose,et al.  Ultrasonic Guided Wave Imaging Techniques in Structural Health Monitoring , 2010 .

[21]  David K. Hsu.  NONDESTRUCTIVE INSPECTION OF COMPOSITE STRUCTURES: METHODS AND PRACTICE , 2008 .

[22]  Jennifer E. Michaels,et al.  APPLICATION OF ACOUSTIC WAVEFIELD IMAGING TO NON-CONTACT ULTRASONIC INSPECTION OF BONDED COMPONENTS , 2006 .

[23]  P. Cawley,et al.  The interaction of Lamb waves with defects , 1992, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[24]  Zhonghua Shen,et al.  The experimental study of fatigue crack detection using scanning laser point source technique , 2011 .

[25]  Y. Tanaka,et al.  Watching ripples on crystals. , 2002, Physical review letters.

[26]  Fabrizio Scarpa,et al.  Structural health monitoring using scanning laser vibrometry: I. Lamb wave sensing , 2004 .

[27]  B. Culshaw,et al.  Broadband Lamb wave measurements in aluminium and carbon/glass fibre reinforced composite materials using non-contacting laser generation and detection , 1997 .

[28]  Hoon Sohn,et al.  Laser based structural health monitoring for civil, mechanical, and aerospace systems , 2012, Smart Structures.

[29]  Constantinos Soutis,et al.  Fibre reinforced composites in aircraft construction , 2005 .

[30]  Experimental observation of the intrusive effect of a contact transducer on ultrasound propagation , 1999 .

[31]  Joseph L. Rose,et al.  Ultrasonic Guided Waves in Structural Health Monitoring , 2004 .

[32]  Sridhar Krishnaswamy,et al.  Mass spring lattice modeling of the scanning laser source technique. , 2002, Ultrasonics.

[33]  G. S. Taylor,et al.  Laser-generated ultrasound: its properties, mechanisms and multifarious applications , 1993 .

[34]  Paul D. Wilcox,et al.  Maximum-likelihood estimation of damage location in guided-wave structural health monitoring , 2011, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[35]  K. T. Gahagan,et al.  Ultrafast interferometric microscopy for laser-driven shock wave characterization , 2002 .

[36]  Massimo Ruzzene,et al.  Simulation and Measurement of Ultrasonic Waves in Elastic Plates Using Laser Vibrometry , 2005 .

[37]  Jung-Ryul Lee,et al.  Laser excitation and fully non-contact sensing ultrasonic propagation imaging system for damage evaluation , 2012, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.