Journal of Failure Analysis and Prevention

, Volume 16, Issue 4, pp 594–600 | Cite as

A Study on the Charpy Impact Response of the Cracked Aluminum Plates Repaired with FML Composite Patches

  • Faramarz Ashenai Ghasemi
  • Lotfali Mozafari Vanani
  • Ali Pourkamali Anaraki
Technical Article---Peer-Reviewed


Fiber metal laminates (FMLs) are widely used in aerospace industries nowadays. Reparation of the cracks in these advanced materials was first done by some aeronautical laboratories in the early 1970s. In this study, experimental investigations were done on the effects of repairing the edge-cracked aluminum plates using the FML patches. The repairing processes were conducted to characterize the response of the repaired structures to the Charpy impact tests. The composite patches were made of one aluminum layer and two woven glass–epoxy composite layers. Three different crack lengths, crack angles, and patch lay-ups were examined. It was indicated that for the lengthen cracks, the effect of increasing the crack angle on energy absorption in the structure was more. When the ratio of crack length to the specimen width, i.e., a/w, is 0.5, the energy absorption per unit area of the specimens having different crack angles but the same patch lay-ups was so different. It was also observed that the percentage of the absorbed energy of 45° cracked angle specimens was about 25% higher than the 0° ones. Also it was observed that the lay-up of the patches and the place where the metal layer was embedded in the FML patches had an important effect on the impact response of the tested specimens. The more the metal layer of the patches is far from the interfacial surface of the aluminum plate and the FML patches, the less the energy absorbs in the structure.


Crack Repair Composite materials FML Aluminum Plate 


  1. 1.
    A.A. Baker, L.R.F. Rose, R. Jones, Advances in the Bonded Composite Repair of Metallic Aircraft Structure (Elsevier, Amsterdam, 2002)Google Scholar
  2. 2.
    A.A. Baker, Repair efficiency in fatigue-cracked aluminum components reinforced with boron/epoxy patches. Fatigue Fract. Eng. Mater. Struct. 16, 753–765 (1993)CrossRefGoogle Scholar
  3. 3.
    C.H. Chue, T.J.C. Liu, The effects of laminated composite patch with different stacking sequences on bonded repair. Compos. Eng. 5(2), 223–230 (1995)CrossRefGoogle Scholar
  4. 4.
    S. Nabousli, S. Mall, Nonlinear analysis of bonded composite patch repair of cracked aluminum panels. Compos. Struct. 41, 303–313 (1998)CrossRefGoogle Scholar
  5. 5.
    K.H. Chung, W.H. Yang, A study on the fatigue crack growth behavior of thick aluminum panels repaired with a composite patch. Compos. Struct. 60, 1–7 (2003)CrossRefGoogle Scholar
  6. 6.
    A.C. Okafor, N. Singh, U.E. Enmuoh, S.V. Rao, Design, analysis and performance of adhesively bonded composite patch repair of cracked aluminum aircraft panels. Compos. Struct. 71, 258–270 (2005)CrossRefGoogle Scholar
  7. 7.
    V. Sabelkin, S. Mall, M.A. Hansen, R.M. Vandawaker, M. Derriso, Investigation into cracked aluminum plate repaired with bonded composite patch. Compos. Struct. 79, 55–66 (2007)CrossRefGoogle Scholar
  8. 8.
    J. Cheng, H. Han, F. Taheri, An adaptive enhancement of dynamic buckling of a laminated composite beam under axial impact by surface bonded piezoelectric patches. Comput. Methods Appl. Mech. Eng. 197, 2680–2691 (2008)CrossRefGoogle Scholar
  9. 9.
    S.M.R. Khalili, R. Ghadjar, M. Sadeghinia, R.K. Mittal, An experimental study on the Charpy impact response of cracked aluminum plates repaired with GFRP or CFRP composite patches. Compos. Struct. 89, 270–274 (2010)CrossRefGoogle Scholar
  10. 10.
    R. Steiner, Handbook, Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, vol. 2 (American Society for Metals (ASM) International, Cleveland, 1990)Google Scholar
  11. 11.
    H.M. Clearfield, D.K. McNamara, G.D. Davis, in Engineered Materials Handbook. Adhesives and Sealants, vol. 3, ed. by H.F. Brinson, H.F. Brinson (ASM International, Cleveland, 1990), p. 260Google Scholar
  12. 12.
    H. Hosseini-Toudeshky, B. Mohammadi, S. Bakhshandeh, Crack trajectory analysis of single-side repaired thin panels in mixed-mode conditions using glass/epoxy patches. Comput. Struct. 86, 997–1005 (2008)CrossRefGoogle Scholar
  13. 13.
    ASTM E 23-02A, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials (American Society for Testing and Materials (ASTM), West Consnohocken, 2010)Google Scholar
  14. 14.
    Huntsman, Advanced materials data sheet for Araldite LY5052-1/Aradure 5052-1 (2007),
  15. 15.
    Huntsman, Advanced materials data sheet for Araldite 2015 (2007),
  16. 16.
    R.F. Wegman, Surface preparation techniques for adhesive bonding (William Andrew Inc, Norwich, 1989)Google Scholar
  17. 17.
    W. Hufenbach, F. Marques Ibraim, A. Langkamp, R. Böhm, A. Hornig, Charpy impact tests on composite structures—an experimental and numerical investigation. Compos. Sci. Technol. 68, 2391–2400 (2008)CrossRefGoogle Scholar

Copyright information

© ASM International 2016

Authors and Affiliations

  • Faramarz Ashenai Ghasemi
    • 1
  • Lotfali Mozafari Vanani
    • 1
  • Ali Pourkamali Anaraki
    • 1
  1. 1.Shahid Rajaee Teacher Training University (SRTTU), LavizanTehranIran

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