The Influence of Loading Rate on the Mode III Interlaminar Fracture Toughness of Composite/Steel Bi-material Systems

Abstract

In this article, the Mode III interlaminar fracture properties of a glass/ epoxy-steel bi-material system are investigated as a function of crosshead displacement rates using the edge crack torsion (ECT) test geometry. For purposes of comparison, tests were also undertaken on the plain glass/epoxy composite. For a given crack length, it has been shown that the interlaminar fracture toughness of the bi-material system was inferior to that offered by the plain composite, an effect that is attributed to the reduced toughness of the interface between the two materials. The Mode III fracture toughness of both the plain composite and the bi-material samples exhibited a crack length dependency, with the measured value of G_IIIc increasing with crack length. Verification of the trends in the experimental data was achieved by conducting a finite element analysis of the ECT specimen and good agreement was achieved. Furthermore, the interlaminar fracture toughness of the plain composite remained roughly constant over the range of crosshead displacement rates considered here, suggesting that it does not exhibit a rate-sensitive fracture behavior. In contrast, the bi-material samples exhibited very low values of Mode III fracture toughness at impact rates, associated with extensive debonding of the steel from the composite material.

Keywords

mode III fracture bi-material delamination toughness.

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References

Schoeppner, G.A. and Abrate, S. (2000). Delamination Threshold Loads for Low Velocity Impact on Composite Laminates, Composites Part A - Applied Science and Manufacturing, 31: 903-915.

Prichard, J.C. and Hogg, P.J. (1990). The Role of Impact Damage in Post-impact Compression Testing, Composites, 21: 503-511.

Cantwell, W.J. and Morton, J. (1989). Comparison of the Low and High Velocity Impact Response of CFRP, Composites, 20: 545-551.

Dorey, G. , Bishop, S.M. and Curtis, P.T. ( 1985). On the Impact Response of Carbon Fiber Laminates with Epoxy and PEEK Matrices, Composites Science and Technology , 23: 221-237.

Dear, J.P. and Brown, S.A. ( 2003). Impact Damage Processes in Reinforced Polymeric Materials , Composites Part A - Applied Science and Manufacturing, 34: 411-420.

Dorey, G. ( 1984). Impact and Crashworthiness of Composite Structures, Vol. 1, pp. 155-192, Elsevier Applied Science Publication s, New York.

Morton, J. and Godwin, E.W. ( 1989). Impact Response of Tough Carbon-fibre Composites, Composite Structures, 13: 1-19.

Cantwell, W.J. , Curtis, P.T. and Morton, J. (1986). An Assessment of the Impact Performance of CFRP Reinforced with High-strain Carbon Fibres, Composites Science and Technology, 25: 133-148.

Stevanovic, D. , Kalyanasundaram , S. , Lowe, A. and Jar , P.Y.B. (2003). Mode I and Mode II Delamination Properties of Glass/Vinyl-ester Composite Toughened by Particulate Modified Interlayers, Composites Science and Technology, 63: 1949-1964.

10.

Hiley, M.J. ( 2000). Delamination between Multi-directional Ply Interfaces in Carbon-epoxy Composites under Static and Fatigue Loading, In: Williams, J.G. and Pavan, A. (eds), Fracture of Polymers, Composites and Adhesives, Vol. 27, pp. 61-72, ESIS Publication, Elsevier, Amsterdam.

11.

Jordan, W.M. , Bradley, W.L. and Moulton, R.J. (1989). Relating Resin Mechanical Properties to Composite Delamination Fracture Toughness, Journal of Composite Materials, 23: 923-943.

12.

Pereira, A.B. , de Morais, A.B. , de Moura, M.F.S.F. and Magalhaes , A.G. (2005). Mode I Interlaminar Fracture of Woven Glass/Epoxy Multidirectional Laminates , Composites Part A - Applied Science and Manufacturing, 36(8): 1119-1127.

13.

Donaldson, S.L. (1988). Mode III Interlaminar Fracture Characterization of Composite Materials, Composites Science and Technology, 32: 225-249.

14.

Meziere, Y. , Michel, L. and Carronnier, D. (2000). Mixed-mode Delamination Failure in Carbon Fiber/Composites under Quasi-static and Cyclic Loading, In: Williams, J.G. and Pavan, A. (eds), Fracture of Polymers, Composites and Adhesives , Vol. 97, pp. 97-110, ESIS Publication, Elsevier, Amsterdam.

15.

Aliyu, A.A. and Daniel, I. ( 1985). Effects of Strain Rate on Delamination Fracture Toughness of Graphite/Epoxy, In: Johnson, W.S. (ed.), Delamination and Debonding of Materials, ASTM STP876, pp. 336-348, American Society for Testing Materials, Philadelphia.

16.

Beguelin, P. , Barbezat, M. and Kausch, H.H. (1991). Mechanical Characterization of Polymers and Composites with a Servohydraulic High-speed Tensile Tester , Journal of Physics III, 1: 1867-1880.

17.

Smiley, A.J. and Pipes, R.B. (1987). Rate Effects on Mode I Interlaminar Fracture Toughness in Composite Materials, Journal of Composite Materials, 21: 670-687.

18.

Maikuma, H. , Gillespie, J.W. and Wilkins, D.J. ( 1989). Analysis and Experimental Characterization of the Center Notch Flexural Test under Impact Loading, Journal of Composite Materials, 23: 757-786.

19.

Blackman, B.R.K. , Dear, J.P. , Kinloch, A.J. , MacGillivray , H. , Wang, Y. , Williams, J.G. and Yayla, P. (1996). The Failure of Fiber Composites and Adhesively Bonded Fiber Composites under High Rates of Test Mixed-mode I/II and Mode II Loadings. Journal of Materials Science, 31: 4467-4477.

20.

Donaldson, S.L. (1987). In: ICCM-V1 Proceedings of the 6th International Conference on Composite Materials, Imperial College of Science and Technology, London, UK, 20-24 July, Vol. 3, pp. 274-281.

21.

Donaldson, S.L. (1988). Mode III Interlaminar Fracture Characterization of Composite Materials, Composite Science and Technology, 32: 225-249.

22.

Becht, G. and Gillespie, J.W. ( 1988). Design and Analysis of the Crack Rail Shear Specimen for Mode III Interlaminar Fracture, Composite Science and Technology, 31: 143-157.

23.

Lee, S.M. (1993). An Edge Crack Torsion Method for Mode III Delamination Fracture Testing, Journal of Composites Technology and Research, 15: 193-201.

24.

Li, J. , Lee, S.M. , Lee, E.W. and O’Bien, T.K. ( 1997). Evaluation of the Edge Crack Torsion (ECT) Test for Mode III Interlaminar Fracture Toughness of Laminated Composites, Journal of Composites Technology and Research, 19: 174-183.

25.

Ratcliffe, J.G. (2004). Characterization of the Edge Crack Torsion (ECT) Test for Mode III Fracture Toughness Measurement of Laminated Composites, NASA/TM-2004-213269.

26.

Li, X. , Carlsson, L.A. and Davies, P. ( 2004). Influence of Fiber Volume Fraction on Mode III Interlaminar Fracture Toughness of Glass/Epoxy Composites, Composites Science and Technology, 64: 1279-1286.

27.

Dattaguru, B. , Venkatesha, K.S. , Ramamurthy, T.S. and Buchholz, F.G. (1994). Finite Element Estimates of Strain Energy Release Rate Components at the Tip of an Interface Crack under Mode I Loading, Engineering Fracture Mechanics, 49: 451-463.

28.

Raju, I.S. , Crews, J.H. and Aminpour, M.A. ( 1998). Convergence of Strain Energy Release Rate Components for Edge-delaminated Composite Laminates, Engineering Fracture Mechanics, 30: 383-396.

29.

Krueger, R. (2004). Virtual Crack Closure Technique: History, Approach and Applications, Applied Mechanics Revision , 57: 109-145.

30.

Zhao, D. and Wang, Y. ( 1998). Mode III Fracture Behaviour with Edge Crack in Torsion , Theoretical and Applied Fracture Mechanics, 29: 109-123.

31.

Shivakumar, K.N. , Tan, P.W. and Newman, J.C. (1988). A Virtual Crack Closure Technique for Calculating Stress Intensity Factors for Cracked Three-dimensional Bodies, International Journal of Fracture, 36: 43-50.