The Failure Strength for Pin-Loaded Multi-Directional Fiber-Glass Reinforced Epoxy Laminate

Abstract

In this study, failure characteristics of laminated composites loaded by means of a single fastener were investigated. The development and evaluation of joint capability for both failure mode and ultimate load are the major aims. Tests have been carried out on single pinned joints in multi-directional glassfiber reinforced epoxy for a range of laminate configurationsand specimen geometry. For [90/0]2s and [45]2s laminates with single-hole joints the strengths have been measured; the effects of variables such as ply orientation, laminate edge and side distances were discussed in the light of the results. In addition, by using finite element code PDNLPIN, a static progressive failure analysis was performed. Comparisons were made between the test data and the results of the model. The effect of material nonlinearity on the prediction of the failure loadswas studied. Good agreement was found between numerical predictions and the experimental data.

Keywords

layered structures glass fibers strength stress–strain curves pin

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References

1. Matthews, F.L. , Wong, C.M. and Chryssafitis, S. (July 1982). Stress Distribution Around a Single Bolt in Fiber-Reinforced Plastic, Composites, 316–322.

2. Barboni, R. , Gandenzi, P. and Carlini, S.A. (1990). Three-Dimensional Analysis of Edge Effects in Composite Laminates with Circular Holes, Composite Structures, 15: 115–136.

3. Chang, F.K. , Scott, R.A. and Springer, G.S. (1982). Strength of Mechanically Fastened Composite Joints, J. Composite Materials, 16: 470–494.

4. Chang, F.K. (1986). The Effect of Pin Load Distribution on the Strength of Pin Loaded Holes in Laminated Composites, J. Composite Materials, 20: 401–408.

5. Camanho, P.P. and Matthews, F.L. (1999). A Progressive Damage Model for Mechanically Fastened Joints in Composite Laminates, J. Composite Materials, 33: 2248–2280.

6. Lessard, L.B. and Shokrieh, M.M. (1995). Two-Dimensional Modeling of Composite Pinned–Joint Failure, J. Composite Materials, 29: 671–697.

7. Quinn, W.J. and Matthews, F.L. (1977). The Effect of Stacking Sequence on the Pin-Bearing Strength in Glass Fiber Reinforced Plastic, J. Composite Materials, 11: 139–145.

8. Collings, T.A. (1977). The Strength of Bolted Joints in Multi-Directional CFRP Laminates, Composites, 43–55.

9. Kretsis, G. and Matthews, F.L. (April 1985). The Strength of Bolted Joints in Glass Fiber/ Epoxy Laminates, J. Composite Materials, 16: 92–102.

10.

10. Camanho, P.P. and Matthews, F.L. (1997). Stress Analysis and Strength Prediction of Mechanically Fastened Joints in FRP: A Review, Composites Part A, 28A: 529–547.

11.

11. Hart-Smith, L.J. (1980). Mechanically Fastened Joints for Advanced Composites-Phenomelogical Considerations and Simple Analysis. In: Leneo, E.M. , Oplinger, D.W. and Burke, J.J. (eds.), Fibrous Composites in Structural Design, Plenum Press, New York.

12.

12. Collings, T.A. (July 1982). On the Bearing Strengths of CFRP Laminates, Composites, 241–252.

13.

13. ASTM 3039–76 . (1982). Test Method for Tensile Properties of Fiber-Resin Composites. American Society for Testing of Materials.

14.

14. Adams, D.F. (1998). Mechanical Test Fixture. In: Jenkins, C.H. (ed.), Manual of Experimental Methods for Mechanical Testing of Composites, Fairmont Press, Inc., London.

15.

15. Walrath, D.E. and Adams, D.F. (1983). The Iosipescu Shear Test as Applied to Composite Materials, J. Experimental Mechanics, 105–110.

16.

16. Okutan, B. (2001). Stress and Failure Analysis of Laminated Composite Pinned Joints, PhD Thesis, Department of Mechanical Engineering, Dokuz Eylul University, Izmir, Turkey.

17.

17. Hahn, H.T. (1973). Nonlinear Behavior of Laminated Composites, J. Composite Materials, 7: 257–271.

18.

18. ASTM D 3518–76 . (1982). In-Plane Shear Stress–Strain Response of Unidirectional Reinforced Plastics, American Society for Testing of Materials.

19.

19. Okutan, B. , Aslan, Z. and Karakuzu, R. (2001). A Study of the Effects of Various Geometric Parameters on the Failure Strength of Pin-Loaded Woven-Glass-Fiber Reinforced Epoxy Laminate, Composite Science and Technology, 61: 1491–1497.

20.

20. Aktas, A. and Karakuzu, R. (1999). Failure Analysis of Two Dimensional Carbon-Epoxy Composite Plate Pinned Joint, Mechanics of Composite Material Structures, 6: 347–361.

21.

21. Hashin, Z. (1980). Failure Criteria for Unidirectional Fiber Composites, J. Applied Mechanics, 47: 329–334.