INVESTIGATION OF EXTERNEL BONDED PATCH REPAIR OF LAMINATED COMPOSITE MATERIALS EXPERIMENTALY

Öz

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

Anahtar Kelimeler

• Laminate Composite Materials,bonded repair,patch,adhesive,failure strengt

Kaynakça

1. 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.