Advanced SearchSearch Tips
Failure Characteristics of Scarf Patch-repaired Composite Single-lap Joints
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Composites Research
  • Volume 29, Issue 3,  2016, pp.117-124
  • Publisher : The Korean Society for Composite Materials
  • DOI : 10.7234/composres.2016.29.3.117
 Title & Authors
Failure Characteristics of Scarf Patch-repaired Composite Single-lap Joints
Kim, Choong-Hyun; Yoo, Jae-Seung; Byeon, Chang-Seok; Ju, Hyun-Woo; Park, Min-Young; Choi, Jin-Ho; Kweon, Jin-Hwe;
  PDF(new window)
The failure strength of composite single-lap joint repaired using scarf patch was investigated by test and finite element method. A total of 45 specimens were tested changing scarf ratio, stacking pattern, and defect size to study the failure strength and mode. Except for one case, all repaired specimens showed the equal or higher strength than the sound specimens and the effect of considered repair parameters was not remarkable. It was found through the failure mode inspection that the surface treatment for bonding was not enough in the case which failed at the lower load than the sound specimen. Three-dimensional finite element analysis was conducted to verify the test results. It was confirmed that the considered repair parameters do not significantly affect the stress distribution of the specimens. It was also observed that the applied tensile load is relieved passing through the overlapped region thickness of which is almost double. From this study, it is concluded that if the bonding procedure for adherends and patch including surface treatment for fabric layer is thoroughly followed, the strength of repaired single-lap joint can be restored up to the strength of sound one.
Composite material;Single-lap joint;Repair;Scarf patch;Strength recovery rate;
 Cited by
Baker, A., Dutton, S., and Kelly, D., Composite Materials for Aircraft Structures, American Institute of Aeronautics and Astronautics, Inc., Reston, U.S.A, 2004.

Thunga, M., Larson, K., Lio, W., Weerasekera, T., Akinc, M., and Kessler, M.R., "Low Viscosity Cyanate Ester Resin for the Injection Repair of Hole-edge Delaminations in Bismaleimide/Carbon Fiber Composites," Composites Part A: Applied Science and Manufacturing, Vol. 52, 2013, pp. 31-37.

Choi, J.W., Hwang, W., Park, H.C., and Han, K.S., "Study of Fatigue Behavior of Repaired Composites," Composite Research, Vol. 12, No. 3, 1999, pp. 26-35.

Lee, W.Y., and Lee, J.J., "Analysis of Fatigue Crack Growth Behavior in Composite-repaired Aluminum Plate," Composite Research, Vol. 17, No. 4, 2004, pp. 68-73.

Kong, C.D., Park, H.B., Lim, S.J., and Shin, C.J., "A Study on Compressive Strength of Carbon/epoxy Composite Structure Repaired with Bonded Patches after Impact Damage," Composite Research, Vol. 23, No. 5, 2010, pp. 15-21.

Kim, H.S., Lee, S.J., and Lee, D.G., "Development of a Strength Model for the Cocured Stepped Lap Joints under Tensile Loading," Composite Structures, Vol. 32, No. 1-4, 1995, pp. 593-600. crossref(new window)

Kim, J.H., Park, B.J., and Han, Y.W., "Evaluation of Fatigue Characteristics for Adhesively-bonded Composite Stepped Lap Joint," Composite Structures, Vol. 66, No. 1-4, 2004, pp. 69-75. crossref(new window)

Harman, A.B., and Wang, C.H., "Improved Design Methods for Scarf Repairs to Highly Strained Composite Aircraft Structure," Composite Structures, Vol. 75, No. 1-4, 2006, pp. 132-144. crossref(new window)

Gunnion, A.J., and Herszberg, I., "Parametric Study of Scarf Joints in Composite Structures," Composite Structures, Vol. 75, No. 1-4, 2006, pp. 364-376. crossref(new window)

Kumar, S.B., Sivashanker, S., Bag, A., and Sridhar, I., "Failure of Aerospace Composite Scarf-joints Subjected to Uniaxial Compression," Materials Science and Engineering: A, Vol. 412, No. 1-2, 2005, pp. 117-122.

Kumar, S.B., Sridhar, I., Sivashanker, S., Osiyemi, S.O., and Bag, A., "Tensile Failure of Adhesively Bonded CFRP Composite Scarf Joints," Materials Science and Engineering: B, Vol. 132, No. 1-2, 2006, pp. 113-120.

Breitzman, T.D., Iarve, E.V., Cook, B.M., Schoeppner, G.A., and Lipton, R.P., "Optimization of a Composite Scarf Repair Patch under Tensile Loading," Composites Part A: Applied Science and Manufacturing, Vol. 40, No. 12, 2009, pp. 1921-1930.

ASTM D3165-07. Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-lap-joint Laminated Assemblies.

ASTM D1002-01. Standard Test Method for Apparent Shear Strength of Single-lap-joint Adhesively Bonded Metal Specimens by Tension Loading(metal-to-metal).

Anyfantis, K.N., and Tsouvalis, N.G., "Loading and Fracture Response of CFRP-to-steel Adhesively Bonded Joints with Thick Adherents - Part I: Experiment," Composite Structures, Vol. 96, 2013, pp. 850-857. crossref(new window)

Kim, K.S., Yoo, J.S., Yi, Y.M., and Kim, C.G., "Failure Mode and Strength of Uni-directional Composite Single Lap Bonded Joints with Different Bonding Methods," Composite Structures, Vol. 72, No. 4, 2006, pp. 477-485. crossref(new window)

Benard, Q., Fois, M., and Grisel, M., "Peel Ply Surface Treatment for Composite Assemblies: Chemistry and Morphology Effects," Composites Part A: Applied Science and Manufacturing. Vol. 36, No. 11, 2005, pp. 1562-1568.