Models were developed for calculating the failure loads of composite laminates repaired by scarf and uniform lap techniques. The models take into account anisotropy of each ply in the laminate and in the repair ply and non-elastic behavior of the adhesive or resin interlayer between the laminate and the repair patch. On the basis of the models two computer codes were written for generating numerical values of the failure loads. The first code is for calculating the failure loads of laminates repaired by the uniform lap technique, the second for calculating the failure loads of laminates repaired by the scarf technique. Failure loads calculated by the models, and the corresponding computer codes, were compared with data, and good agreements were found between the results of the models and the tests.
Get full access to this article
View all access options for this article.
References
1.
1. Chan, W. S. and C. T. Sun. 1980. "Interfacial Stresses and Strength of Lap Joints,"21st Conference of Structures, Structural Dynamics, and Materials, AIAA/ASMEASCE/AHS, pp. 656-663.
2.
2. Volkersen, O.1938. "Die Nietkraftverteilung in Zugbeanspruchten Nietverbindungen mit konstanten Laschenquerschnitten,"Luftfahrtforschung, 15:41-47.
3.
3. Goland, M. and E. Reissner. 1944. "The Stresses in Cemented Joints,"Journal of Applied Mechanics, 11:A17-A27.
4.
4. Pirvics, J.1974. "Two Dimensional Displacement-Stress Distributions in Adhesive Bonded Composite Structures,"Journal of Adhesion, 6:207-228.
5.
5. Allman, D. J.1977. "A Theory for Elastic Stresses in Adhesive Bonded Lap Joints,"Quarterly Journal of Applied Mathematics, XXX, (Pt. 4):415-436.
6.
6. Ojalvo, I. U. and H. L. Eidinoff. 1978. "Bond Thickness Effects upon Stresses in Single-Lap Adhesive Joints,"AIAA Journal, 16:204-211.
7.
7. Renton, W. J. and J. R. Vinson. 1975. "The Efficient Design of Adhesive Bonded Joints,"Journal of Adhesion, 7:175-193.
8.
8. Thamm, F.1976. "Stress Distribution in Lap Joints with Partially Thinned Adherends,"Journal of Adhesion, 7:301-309.
9.
9. Wooley, G. R. and D. R. Carver. 1971. "Stress Concentration Factors for Bonded Lap Joints,"Journal of Aircraft, 8:817-820.
10.
10. Adams, R. D. and N. A. Peppiatt. 1974. "Stress Analysis of Adhesive-Bonded Lap Joints,"Journal of Strain Analysis, 9:185-196.
11.
11. Bigwood, D. A. and A. D. Crocombe. 1989. "Elastic Analysis and Engineering Design Formulae for Bonded Joints,"International Journal of Adhesion and Adhesives, 9:229-242.
12.
12. Bigwood, D. A. and A. D. Crocombe. 1990. "Non-Linear Adhesive Bonded Joints Design Analyses,"International Journal of Adhesion and Adhesives, 10:31-41.
13.
13. Crocombe, A. D.1989. "Global Yielding as a Failure Criterion for Bonded Joints,"International Journal of Adhesion and Adhesives, 9:145-153.
14.
14. Szépe, F.1966. "Strength of Adhesive-Bonded Lap Joints with Respect to Change of Temperature and Fatigue,"Experimental Mechanics, 6:280-286.
15.
15. Adams, R. D., J. Coppendale and N. A. Peppiatt. 1978. "Failure Analysis of Aluminuium-Aluminium BondedJoints,"Adhesion 2, K. W. Allen, ed., Applied Science Publisher, pp. 105-120.
16.
16. Lubkin, J. L.1957. "A Theory of Adhesive Scarf Joints,"Journal of Applied .Mechanics, 24:255-260.
17.
17. Kim, H. S., S. J. Lee and D. G. Lee. 1995. "Development of a Strength Model for the Cocured Stepped Lap Joints under Tensile Loading,"Composite Structures, 32:593-600.
18.
18. Renton, W. J. and J. R. Vinson. 1975. "On the Behavior of Bonded Joints in Composite Material Structures,"Engineering Fracture Mechanics, 7:41-60.
19.
19. Renton, W. J. and J. R. Vinson. 1977. "Analysis of Adhesively Bonded Joints between Panels of Composite Materials."Journal of Applied Mechanics, 44:101-106.
20.
20. Baker, R. M. and F. Hatt. 1973. "Analysis of Bonded Joints in Vehicular Structures."AIAA Journal, 11:1650-1654.
21.
21. Grimes, G. C.1971. "Stress Distribution in Adhesive Bonded Lap Joints," SAE Trans. 710107, pp. 370-378.
22.
22. Erdogan, F. and M. Ratwani. 1971. "Stress Distribution in Bonded Joints."Journal of Composite Materials, 5:379-393, Lancaster. PA: Technomic Publishing Company. Inc.
23.
23. Johnson, C. L.1989. "Effect of Ply Staking Sequence on Stress in a Scarf Joint."AIAA Journal, 27:79-86.
24.
24. Hart-Smith, L. J.1973. Adhesive-Bonded Single-Lap Joints. NASA Contractor Report, CR 112236.
25.
25. Hart-Smith, L. J.1973. Adhesive-Bonded Double-Lap Joints. NASA Contractor Report, CR 112235.
26.
26. Hart-Smith, L. J.1973. Non-Classical Adhesive-Bonded Joints in Practical Aerospace Construction. NASA Contractor Report, CR 112238.
27.
27. Hart-Smith, L. J.1981. "Further Developments in the Design and Analysis of Adhesive-Bonded Structural Joints,"Joining of Composite Materials, ASTM STP 749, K. T. Kedward, ed.. American Society for Testing and Materials, pp. 3-31.
28.
28. Adams, R. D., R. W. Atkins, J. A. Harris and A. J. Kinloch. 1986. "Stress Analysis and Failure Properties of Carbon-Fiber-Reinforced-Plastic/Steel Double-Lap Joints,"Journal of Adhesion, 20:29-53.
29.
29. Adams, R. D.1987. "Theoretical Stress Analysis of Adhesively Bonded Joints."Joining Fibre-Reinforced Plastics, F. L. Matthews, ed., Elsevier Applied Science Publisher, 185-226.
30.
30. Hart-Smith. L. J.1973. Adhesive-Bonded Scarf and Stepped-Lap Joints. NASA Contractor Report, CR 112237.
31.
31. Ahn, S. H. and G. S. Springer. "Repair of Composite Laminates I: Test Results,"Journal of Composite Materials, Lancaster, PA: Technomic Publishing Company, Inc.
32.
32. Tsai, S. W. and H. T. Hahn. 1980. Introduction to Composite Materials. Lancaster, PA: Technomic Publishing Company., Inc.
33.
33. Megson, T. H. G.1990. Aircraft Structures for Engineering Students, 2nd edHalsted Press, pp. 405-406.
34.
34. Naik, N. J.1994. Woven Fabric Composites. Lancaster, PA: Technomic Publishing Company, Inc.
