Detection of disbonds in multi‐layer bonded structures using the laser ultrasonic pulse‐echo mode

HighlightsWe investigate a quantitative method for evaluating disbonds at the adhesive layer.We investigate the characteristics of reflected laser ultrasonic waves.Laser ultrasonic methods with reflection can recognize a 3 mm size disbond.The reflected shear waves are more sensitive to disbonds than others.The actual sizes are in good agreement with the measurement results. ABSTRACT The laser ultrasonic technique with a pulse‐echo mode has been investigated to detect disbonds in a multi‐layer bonded structure and a quantitative method has been proposed to evaluate the defect sizes. The simulations were carried out to analyze influences of spot sizes on the characteristics of laser ultrasonic reflected waves, the interaction of laser ultrasonic reflected waves with disbonds, and quantitative characterization on disbonds. A noncontact laser ultrasonic inspection system has been established to perform a series of experiments to verify the theoretical results. Laser ultrasonic C‐scans based on reflected shear waves can clearly redraw appearances of disbonds in the adhesive bond. The proposed quantitative method can evaluate the sizes of disbonds within a reasonable error range. Moreover, the experimental data are in good agreement with the simulation results. Therefore, a combination of the laser ultrasonic pulse‐echo mode and the proposed quantitative strategy is practical for accurate detection of disbonds in multi‐layer bonded structures.

[1]  Donatella Cerniglia,et al.  3D simulations and experiments of guided wave propagation in adhesively bonded multi-layered structures , 2010 .

[2]  Jian Lu,et al.  Numerical simulation of laser-generated ultrasonic waves in layered plates , 2004 .

[3]  Peipei Liu,et al.  Numerical simulation of damage detection using laser-generated ultrasound. , 2016, Ultrasonics.

[4]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[5]  F. Lanza di Scalea,et al.  Ultrasonic Guided Wave Inspection of Bonded Lap Joints: Noncontact Method and Photoelastic Visualization , 2001 .

[6]  장윤희,et al.  Y. , 2003, Industrial and Labor Relations Terms.

[7]  Roman Gr. Maev,et al.  Acoustical methods for the investigation of adhesively bonded structures: A review , 2004 .

[8]  J. Monchalin.  Progress Towards the Application of Laser-Ultrasonics in Industry , 1993 .

[9]  Non-destructive characterisation of adhesive bond strength by Lamb waves , 2003 .

[10]  G. A. Georgiou,et al.  Non-destructive testing methods for adhesively bonded joint inspection : a review , 1995 .

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

[12]  A. Lomonosov,et al.  Laser-generated ultrasonic pulse shapes at solid wedges. , 2016, Ultrasonics.

[13]  A. Karabutov,et al.  Quantitative analysis of the influence of voids and delaminations on acoustic attenuation in CFRP composites by the laser-ultrasonic spectroscopy method , 2014 .

[14]  Zhenggan Zhou,et al.  Characteristics of laser ultrasound interaction with multi-layered dissimilar metals adhesive interface by numerical simulation , 2015 .

[15]  V. Gusev,et al.  Evaluation of crack parameters by a nonlinear frequency-mixing laser ultrasonics method. , 2016, Ultrasonics.

[16]  D. Clorennec,et al.  Nondestructive evaluation of cylindrical parts using laser ultrasonics. , 2002, Ultrasonics.

[17]  C. He,et al.  Reflection and transmission coefficients of the SH0 mode in the adhesive structures with imperfect interface. , 2016, Ultrasonics.

[18]  이화영.  X , 1960, Chinese Plants Names Index 2000-2009.

[19]  Paul Fromme,et al.  High-frequency guided ultrasonic waves for hidden defect detection in multi-layered aircraft structures. , 2014, Ultrasonics.

[20]  A. A. Khalil,et al.  Non-destructive testing of adhesively bonded joints using vibrational analysis , 1991 .

[21]  Donatella Cerniglia,et al.  Detection of Disbonds in Multi-layer Structures by Laser-Based Ultrasonic Technique , 2008 .

[22]  Paul Fromme,et al.  High-frequency guided ultrasonic waves for the detection of hidden defects in multi-layer aerospace structures , 2012, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[23]  Peter Cawley,et al.  The Non-destructive Testing of Adhesively Bonded Structure: A Review , 1986 .