Research Article of International Research Journal of Materials Sciences and Applications
Optimizing the Surface Quality of Textile Composites for Bonded Repairs
Riddhi Naik and Sunil Joshi
Department of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
With the accelerated use of woven composites in many industries like aerospace, marine, sports, construction, automobile and many more their repairs have become an inevitable part of it. The current problem with repairs is, even with precise machining there are bond failures due to inadequate surface quality. In this research, machining techniques like stepped and scarf repairs and abrasion techniques are used on the woven coupons to evaluate their influence on the surface characteristics. Preliminary evaluation of the surface characteristics is done using a surface profiler, to measure the topographical features like surface roughness and amplitude of the peaks and valleys. Further, the results obtained from the profiler are validated using microscopy and contact angle test to identify the trend between surface roughness and wettability. Finally, the results obtained from the various experiments helps us to identify an optimum surface quality needed prior to bonding in terms of surface roughness and contact angle. The results for 3K woven glass fibre shows an optimum surface roughness in the range of 2-4 µm and contact angle below 60˚
Keywords: Surface modification; Surface quality, Microscopy, Surface roughness Ra and Arithmetic mean roughness Rz.
How to cite this article:
Riddhi Naik and Sunil Joshi, Optimizing the Surface Quality of Textile Composites for Bonded Repairs. International Research Journal of Materials Sciences and Applications, 2017; 1:7. DOI:10.28933/ijmsa-2017-07-0802
1. Boeing Ltd. Boeing 737-800 Structural Repair Manual. USA: Boeing Ltd. 2003.
2. Airbus Ltd. Airbus A320 Structural Repair Manual. France: Airbus Ltd. 2007
3. Jones J.S. and Graves S.R., Repair Techniques for Celion-LARC-160 Graphite-Polyimide Composite Structures. NAS1-16448, NASA Langley Research Center, June 1984.
4. Wang C.H. and Gunnion A.J., Composite Science and Technology, 68 (2008) 35-46.
5. Lin G.W., Chen P.H., Acta Aeronautica Et Astronautica Sinica, 30(10) (2009) 1877-1882.
6. Harman A.B., Wang C.H., Damage tolerance and impact resistance of composite scarf joints. ICCM-16, 2007, Japan.
7. Cheuk P.T., Tong L., Wang C.H., Baker A., Chalkley P., Fatigue crack growth in adhesively bonded composite-metal double-lap joints, Composite Structures, 2002, pp 109-115.
8. Maxwell J. D., and Andrew M. Assessing adhesive bond failures: Mixed-mode bond failures explained. Adhesion associates. 2010.
9. Kinlock, A.J., Adhesion and Adhesives, Springer Netherlands, 1987, New York.
10. Hart-Smith, L.J., “Adhesive Bonded Single Lap Joints,” Technical report. 1973. NASA CR 112236.
11. K. Palanikumar, Machining technology for composite materials: Principles and practices, 1st ed. Woodhead Publishing. 2011.
12. J Paolo Davim, Machining of composite materials, ISTE Ltd. and John Wiley and sons, Inc. 1st ed. Great Britain and USA. 2010.
13. Azmi, A.I.; Lin, R.J.T.; Bhattacharyya, D., Experimental study of machinability of GFRP composites by end milling. Materials and Manufacturing Processes,2012, 27 (10), pp 1045–1050.
14. N.S. Hui, L.C. Zhang, A study on the grindability of multidirectional carbon fibre-reinforced plastics. Journal of Materials Processing Technology 2003, 140-152–156.
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