Composite Patch Repair of Central Crack Growth in Aluminium Alloy Plate

In this work, repaired crack in 6061- T6 aluminum plate with composite patches presented, firstly we determine the displacement, strain and stress, also the first six mode shape of the plate, secondly we took the same model adding central crack initiation, which is located in the center of the plate, its seize vary from 20 mm to 60 mm and we compare the first results with second. Thirdly we repair various cracks with composite patch (carbon/ epoxy) and for (2 layers, 4 layers). Finally the comparison of stress, strain, displacement and six first natural frequencies between un-cracked specimen, crack propagation and composite patch repair.

Authors:

• S. Lecheb
• A. Chellil
• H. Mechakra
• A. Zeggane
• H. Kebir

Keywords:

• Composite patch repair
• crack growth
• aluminum alloy plate
• stress.

References:

[1] Baker, A.A., Introduction and overview, in Advances in the bonded
composite repair of metallic aircraft structure, A.A. Baker, L.F. Rose,
and R. Jones, Editors. 2003, Elsevier: Oxford, UK. p. 1-18.
[2] Baker, A. and R. Jones, Bonded repair of aircraft structures. Vol. 7.
1988: Springer.
[3] Hollaway, L. and J. Cadei, Progress in the technique of upgrading
metallic structures with advanced polymer composites. Progress in
Structural Engineering and Materials, 2002. 4(2): p. 131-148.
[4] De Freitas, M. and L. Reis, Failure mechanisms on composite specimens
subjected to compression after impact. Composite Structures, 1998.
42(4): p. 365-373.
[5] J. Rodes, R. Brossier, X.-J. Gong, J. Rousseau. Etude des performances
des structures composites réparées. Matériaux 2006, 13-17 November
2006, Dijon, France
[6] A.C. Okafor, H. Bhogapurapu. Design and analysis of adhesively
bonded thick composite patch repair of corrosion grind-out and cracks
on 2024 T3 clad aluminum aging aircraft structures. Composite
Structures 76 (2006) 138-150.
[7] Chun H. Wang, Andrew J. Gunnion. On the design methodology of scarf
to composite laminates. Composites Science and Technology, 68 (2008)
35-46.
[8] Composite repair, HEXCEL Composites. April 1999, Publication No.
UTC 102
[9] G. Savage, M. Oxley. Repair of composite structures on Formula 1 race
cars. Engineering Failure Analysis.
[10] R. D. Adams and W. C. Wake. Structural adhesive joints in engineering.
Elsevier applied science publishers Ltd 1984. ISBN 0 85334 263 6
[11] Z. Hashin et B. W. Rosen (1964).The elastic module of fiber-reinforced
materials. J.Appl.Mech.June, 223-232.