In this study, the finite element is used to analyze and compare the performances of the double- and single-sided composite repair in aircraft structures in mode I and mixed mode. The stress intensity factors in modes I and II at the crack tip are computed to perform the objective of the study. The effects of the different parameters of repair such as adhesive and patch properties on the SIF variation were highlighted. The obtained results show that the adhesive properties must be optimized in order to increase the advantage of the double patch and to avoid adhesive failure. The patch properties have a significant effect on the beneficial effects of the double symmetric patch.
Callinan, R.J., Sanderson, S. and Keeley, D. ( 1997). Finite Element Analysis of an F-111 Lower Wing Skin Fatigue Crack Repair, DSTO, Melbourne. DSTO-TN-0067.
3.
Schubbe, J.J. and Mall, S. (1999). Modeling of Cracked Thick Metallic Structure with Bonded Composite Patch Repair Using Three-layer Technique, Compos. Struct., 45: 185-193.
4.
Ting, T., Jones, R., Chiu, W.K., Marshall, I.H. and Greer, J.M. ( 1999). Composite Repair to Rib Stiffned Panels, Compos. Struct., 47: 737-743.
5.
Turaga, V.R.S. and Ripudaman, S. (1999). Modelling of Patch Repair to a Thin Cracked Sheet, Eng. Fract. Mech., 62: 267-289.
6.
Jones, R. and Chiu, W.K. ( 1999). Composite Repairs to Crack in Metallic Components, Compos . Struct., 44: 17-29.
7.
Bachir, B.B. , Belhouari M. and Serier, B. (2002). Computation of the Stress Intensity Factors for Repaired Cracks with Bonded Composite Patch in Mode I and Mixed Mode, Compo. Struct., 56: 401-406.
8.
Chen, W.H. and Yang, S.H. ( 1995). Estimation of Stress Intensity Factors in Partially Patched Cracked Composite Laminates by Multiplayer Hybrid-stress Finite Element Method ., Finite Elem. Anal. Des., 21: 21-44.
9.
Megueni, A., Bachir, B.B. and Boutabout, B. ( 2003). Computation of the Stress Intensity Factor for Patched Crackwith Bonded Composite Repair in Pure Mode II, Comp. Struct., 59: 415-418.
10.
Achour, T., Bachir, B.B. and Serier, B. ( 2003). Numerical Analysis of the Performances of the Bonded Composite Patch for Reducing Stress Concentration and Repairing Cracks at Notch, Comp. Mat. Sci., 28: 41-48.
11.
Klug, J.C., Maley, S. and Sun, C.T. ( 1999). Characterization of Fatigue Behaviour of Bonded Composite Repairs., J. Aircraft, 36(6): 1016-22.
12.
Swenson, D. and James, M. ( 1998). FRANC2D/L : Version 1.4 User’s Guide available online on the web site: www.cfg.cornell.edu.
