Hayri YILDIRIM, Şükrü ÇETİNKAYA, Haşim PIHTILI

INVESTIGATION OF EXTERNEL BONDED PATCH REPAIR OF LAMINATED COMPOSITE MATERIALS EXPERIMENTALY

For this study, woven glass and carbon fibres reinforced composite materialswere produced. Composite materials have been produced with eightlaminates. For experimental study, specimens with 10 mm internal hole wereprepared. Then, these specimens were repaired by using adhesive andcomposite patches with different repair parameters. Two different bondingpatch type were used for external bonding patch repair of the specimens.These were wet lay out patches and prepreg patches. Test specimens wereprepared in necessary curing temperatures and laboratory conditions. Byperforming the unidirectional tensile test to these specimens, the ultimatefailure loads of these repaired specimens were indicated. By comparing theseultimate failure loads of repaired specimens that prepared with variousparameters, the effects of several repair parameters on the ultimate failurestrength are investigated. These repair parameters are patch bonding area(D/W ratio), bonding length, adhesive thickness and patch thickness.

PDF

___

[1] Liu X., Wang G. (2007). Progressive failure analysis of bonded composite repairs. Composite Structures, 81, 331-340.
[2] Papanikos P., Tserpes K.I., Pantelakis Sp.(2007). Initiation and progression of composite patch debonding in adhesively repaired cracked metallic sheets. Composite Structures, 81, 303-311.
[3] Xiaoquan C.,Baig Y., Renwei H., Yujian G., Jikui Z., (2013). Study of tensile failure mechanisms in scarf repaired CFRP laminates. International Journal of Adhesion & Adhesives, 41, 177-185.
[4] Breitzman T.D., Larve E.V., Cook B.M., Schoeppner G.A., Lipton R.P. (2009), Optimization of a composite scarf repair patch under tensile loading. Composites: Part A, 40, 1921-1930.
[5] Tse P.C., Lau K.J., Wong W.H. (2002), Stress and failure analysis of woven composite plates with adhesive patch-reinforced circular hole. Composites: Part B, 33, 57-65.
[6] Jones R., Chiu W.K. and Smith R., (1995), Airworthiness of Composite Repairs: Failure Mechanisms. Engineering Failure Analysis, 2, 117-128.
[7] Cheng P., Gong X. J. , Hearn D., Aivazzadeh S., (2011), Tensile behaviour of patch-repared CFRP laminates. Composite Structures, 93, 582-589.
[8] Her S. C. (1999), Stress analysis of adhesively-bonded lap joints. Composite Structures, 47, 673-678.
[9] Campilho R.D.S.G., Moura M.F.S.F., Domingues J.J.M.S., (2009), Numerical prediction on the tensile residual strength of repaired CFRP under different geometric changes. International Journal of Adhesion & Adhesives, 29, 195-205.
[10] Wisnom M. R., (1999), Size effects in the testing of fibre-composite materials. Composites Science and Technology, 59, 1937-1957.
[11] Madani K., Touzain S., Feaugas X., Cohendouz S., Ratwani M., (2010), Experimental and numerical study of repair techniques for panels with geometrical discontinuities. Computational Materials Science, 48, 83-93.
[12] Goyal V.K., Johnson E.R., Goyal V.K., (2008), Predictive strength-fracture model for composite bonded joints. Composite Structures, 82, 434-446.
[13] Davis M., Bond D., (1999), Principles and practices of adhesive bonded structural joints and repairs. International Journal of Adhesion & Adhesives, 19, 91-105.
[14] Caminero M.A., Pavlopoulou S., Lopez-Pedrosa M., Nicolaisson B.G., Pinna C., Soutis C., (2013), Analysis of adhesively bonded repairs in composites: Damage detection and prognosis. Composite Structures, 95, 500-517.
[15] Loctite Worlwide Design Handbook, (1988).
[16] Turan K., Kaman M.O.,(2016), Experimental Failure Analysis of Wet-Patch-Repaired U Notched Composite Plates. European Journal of Technic, 6, 91-98.