Evaluation of Adhesive Joints with Ultrasonic Digital Image Correlation

Increasing use of composite materials in industry brings the need for newer and more practical methods to evaluate them. Widespread use of composite materials heavily depends on the manufacturer’s ability to unquestionably ensure its safety, given how much the user trusts them. Non-Destructive Evaluation (NDE) can be used to evaluate adhesive bondline health. This paper employs Digital Image Correlation (DIC) method, one of the known methods in NDE, and combines it with an embedded speckle pattern in order to obtain valuable information from within the adhesive bondline. By recording the movement of the speckles and analyzing their behavior according to DIC algorithms, a strain map of the adhesive is drawn. An adhesive strain map helps find defects that might be out of sight using conventional NDE methods. Previous presentations of this study have shown the ability of the method. A comparative study between experimental results and finite element results was presented. This paper focuses on new experimental findings of this new method and employs ultrasonic image recording to perform DIC. It is shown how defects within adhesive joints are being revealed using this new method.

References

[1] R. C. Waugh, Dulieu-Barton, J. M. and S. Quinn, "Pulse Phase Thermography and its Application to Kissing Defects in Adhesively Bonded Joints," Advances in Experimental Mechanics, vol. viii, no. 70, pp. 369-374, 2011.

[2] C. Jeenjitkaew, Z. Luklinska and F. Guild, "Morphology and Surface Chemistry of Kissing Bonds in Adhesive Joints Produced by Surface Contamination," International Journal of Adhesion and Adhesives, vol. 7, no. 30, pp. 643-653, 2010.

[3] P. N. Marty, N. Desai and J. Anderson, "NDT of Kissing Bond in Aeronautical Structures," www.ndt.net, p. Proc. 16th WCNDT, 2004.

[4] C. C. H. Guyott, P. Cawley and R. D. Adams, "The Nondestructive Testing of Adhesively Bonded Structure- A Review," Journal of Adhesion, vol. 2, no. 20, pp. 129-159, 1986.

[5] J. K. Chambers and J. R. Tucker, "Bondline Analysis Using Swept-Frequency Ultrasonic Spectroscopy,," Insight, vol. 3, no. 41, pp. 151-155, 1999.

[6] P. B. Nagy, "Ultrasonic Detection of Kissing bonds at Adhesive Interfaces," Journal of Adhesion Science and Technology, vol. 8, no. 5, pp. 619-630, 1991.

[7] A. E. Bogdanovich and I. Kizhakkethara, "Three-dimensional finite element analysis of double-lap composite adhesive bonded joint using submodeling approach," Composites Part B: Engineering, vol. 6, no. 30, pp. 537-551, 1999.  

[8] R. D. Adams, P. Cawley and C. C. H. Guyott, "Nondestructive Inspection of Adhesively Bonded Joints," Journal of Adhesion, Vols. 3-4, no. 21, pp. 279-290, 1987.

[9] C. J. Brotherhood, B. W. Drinkwater and S. Dixon, "The Detectability of Kissing Bonds in Adhesive Joints Using Ultrasonic Techniques," Ultrasonics, vol. 7, no. 41, pp. 521-529, 2003.

[10] T. C. Chu, W. F. Ranson, M. A. Sutton and W. H. Peters, "APPLICATIONS OF DIGITAL-IMAGE-CORRELATION TECHNIQUES TO EXPERIMENTAL MECHANICS," Experimental Mechanics, vol. 3, no. 25, pp. 232-244, 1985.

[11] T. Chu, A. Mahajan and C. T. Liu, "An Economical Vision-Based Method to Obtain Whole-Field Deformation Profiles,," Experimental Techniques, vol. 6, no. 26, pp. 25-28, 2002.

[12] R. L. V. Kumar, M. R. Bhat and C. R. L. Murthy, "Evaluation of kissing bond in composite adhesive lap joints using digital image correlation: Preliminary studies," International Journal of Adhesion and Adhesives, no. 47, pp. 60-68, 2013.

[13] J. M. Arenas, J. J. Narbón and C. Alía., "Optimum adhesive thickness in structural adhesives joints using statistical techniques based on Weibull distribution."," International Journal of Adhesion and Adhesives, vol. 30, no. 3, pp. 160-165, 2010.

[14] K. M. Bak, M. Dinesh, K. Kalaichelvan and G. K. Vijayaraghavan, "Effect of Adhesive Thickness Area of Single Lap Joints in Composite Laminate Using Acoustic Emission Technique and FEA.," Insight-Non-Destructive Testing and Condition Monitoring., 2012.

[15] Standard Test Method for Determining Strength of Adhesively Bonded Rigid Plastic Lap-Shear Joints in Shear by Tension Loading, ASTM D 3163 standard.

[16] J. Blaber, B. Adair and A. Antoniou, "Ncorr: open-source 2D digital image correlation matlab software.," Experimental Mechanics, vol. 6, no. 55, pp. 1105-1122, 2015.

[17] G. Stoilov, V. Kavardzhikov and D. Pashkouleva, "A Comparative Study of Random Patterns for Digital Image Correlation," Journal of Theoretical and Applied Mechanics, vol. 42, no. 2, pp. 55-66, 2012.

Metrics
Usage Shares
Total Views
14 Page Views
Total Shares
0 Tweets
14
0 PDF Downloads
0
0 Facebook Shares
Total Usage
14