Experimental Mechanics

, Volume 36, Issue 2, pp 142–147 | Cite as

An experimental investigation of composite repair

  • K. B. Zimmerman
  • D. Liu


This study investigates the repair of a glass/vinylester composite material with damage caused by impact loading and bending. The repair technique is based on the “standard procedures” established in a previous study. In addition to the damage due to bending, the repair of composite plates with straight cutting-line damage is also investigated due to its similarity to the bending fracture and good repeatability for evaluation. It is found that two glass reinforcing patches of plain weave—that is, (0, 90)2—on each side of the specimen can restore the original load-bearing capability of the composite material of concern. The investigation of the cutting-line damage can also be viewed as a study of bond-line angles for composite joining. It is concluded that a bond-line angle greater than 60° can restore the undamaged composite strength. In maintaining a large bond-line angle as well as a large bonding surface, various bond-line configurations are presented. Results from the five joints of V, W, WW, U, and UU shapes further verify this conclusion.


Mechanical Engineer Composite Material Fluid Dynamics Standard Procedure Experimental Investigation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Edward, K. T., ed., Joining of Composite Materials, ASTM STP 749 (1980).Google Scholar
  2. 2.
    Brown, H., ed., Composite Repairs, SAMPE Monograph No. 1 (1985).Google Scholar
  3. 3.
    The Repair of Aircraft Structures Involving Composite Materials, AGARD Conf. Proc.,402 (1986).Google Scholar
  4. 4.
    Baker, A. A. andJones, R., eds., Bonded Repair of Aircraft Structures, Martinus Nijhoff, The Hague, Netherlands (1988).Google Scholar
  5. 5.
    Herriot, J., ed., “Composites,” The International Journal of the Science & Technology of Reinforced Materials,Butterworth-Heineman,Vol. 22,No. 2,March 1991.Google Scholar
  6. 6.
    Zimmerman, K. B., “An Experimental Investigation of the Optimum Joining and Repair of Structural Composites,” Ph.D. dissertation, Michigan State University (1993).Google Scholar
  7. 7.
    Liu, D., Lee, C. Y. andLu, X., “Repairability of Impact-Induced Damage in SMC Composites,”J. Composite Mat.,27 (13),1257–1271 (1993).Google Scholar
  8. 8.
    Liu, D., “Impact-Induced Delamination: A View of Bending Stiffness Mismatching,”J. Composite Mat.,22 (7),674–691 (1988).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1996

Authors and Affiliations

  • K. B. Zimmerman
    • 1
  • D. Liu
    • 2
  1. 1.Academic PartnershipsGeneral Motors CompanyWarren
  2. 2.Department of Materials Science and MechanicsMichigan State UniversityEast Lansing

Personalised recommendations