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Abstract

In the present study, the effect of moisture on the interlaminar fracture toughness of two woven fabric composite materials has been investigated. The composites used are made of a woven fabric 8H Satin glass fiber and 8H Satin carbon fiber. The matrix is a polyetherimide (PEI). The composites are used in aeronautical and aerospace applications. The interlaminar fracture behavior is analyzed using the mode I, double cantilever beam (DCB) test, and the mode II, end notched flexure (ENF), in order to determine the energy required for the initiation and growth of an artificial crack. The composites are subjected to a relative humidity (95%) and a constant temperature (70° C) in a climatic chamber for 30, 60, 120, and 180 days. The delamination energies are calculated using the corrected beam, Berry theories, and the experimental calibration method at the characteristic points. The result shows that the decrease in the fracture behavior is more important in the material CD342 8H Satin weave. The fracture mechanism was also analyzed by means of scanning electron microscopy.

Keywords

mode I (DCB)mode II (ENF)matrix PEI glass fiber carbon fiber weaving humidity temperature strain energy rate SEM

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Bathias, C. and Laksimi, A. (1985). Delamination Threshold and Loading Effect in Fibre Glass Epoxy Composite, In: W. S. Johnson (ed.), Delamination and Debonding of Materials, ASTM STP 876, pp. 217–237.

Bolotin, V.V. (2001). Mechanics of Delaminations in Laminate Composite Structures, Mechanics of Composite Materials, 37: 367–380 .

Hull, D. and Clyne, T.W. (1987). An Introduction to Composite Materials, pp. 212–218, Cambridge Solid State Sciences Series .

Wang, Y. and Zhao, D. (1995). Characterization of Interlaminar Fracture Behaviour of Woven Fabric Reinforced Polymeric Composites , Composites, 26: 115–124 .

Bruner, A. , Tanner, J. , Davies, P. and Wittich, H. (1994). Interlaminar Fracture Testing of Unidirectional Fibre-reinforced Composites Materials: Results from ESIS Round Robins, In: Hogg, P.J. , Schulte, K. and Wittich, H. (eds), Composites Testing and Standardization ECCM-CTS 2, pp. 523-532, Woodhead Publishing .

Selzer, R. and Friedrich, K. (1995). Influence of Water up Take on Interlaminar Fracture Properties of Carbon Fibre Reinforced Polymer Composites , Journal of Materials Science, 30: 334–338 .

Selzer, K. Friedrich (1997). Mechanical Properties and Failure Behaviour of Carbon Fibre Reinforced Polymer Composites under the Influence of Moisture , Composites Part A, 28A: 595–602 .

Zhou, J. and Lucas, J.P. (1995). The Effects of a Water Environment on Anomalous Absorption Behaviour in Graphite/Epoxy Composites , Composites Science and Technology, 53: 57–64 .

Gautier, L. , Mortaigne, B. and Bellenger, V. (1999). Interface Damage Study of Hydrothermally Aged Glass-fibre-reinforced Polyester Composites , Composites Science and Technology, 59: 2329–2337 .

10.

Munson Mc-Gee , S.H. (1996). Effects of Hygrothermal Exposure on the Mechanical Properties of Injection Molded Glass-fiber Reinforced Poly(phenylene sulfide) , Polymer Composites, 17(3): 393–399 .

11.

Pigot, M.R. (1987). Water Absorption in Carbon and Glass Fibre Composites, 6th ICCM & 2nd ECCM, 4: 4181–4189 .

12.

Kaushal, S. , Tankala, K. , Rao, R. and Kishore (1991). Some Hygrothermal Effects on the Mechanical Behaviour and Fractography of Glass Epoxy Composites with Modified Interface , Journal of Materials Science, 26: 6293–6299 .

13.

Asp, L.E. (1998). The Effects of Moisture and Temperature on the Interlaminar Delamination Toughness of a Carbon/Epoxy Composite , Composites Science and Technology, 58: 967–977 .

14.

Vauthier, E. , Abry, J.C. , Bailliez, T. and Chateauminois, A. (1998). Interactions between Hygrothermal Ageing and Fatigue Damage in Unidirectional Glass/Epoxy Composites , Composites Science and Technology, 58: 687–692 .

15.

Flueler, P. and Brunner, A.J. (1992). Crack Propagation in Fibre-reinforced Composite Materials Analysed with in-situ Microfocal X-ray Radiography and Simultaneous Acoustic Emission Monitoring, In: Hogg, P.J. , Sims, G.D. , Matthews, F.L. , Bunsell, A.R. and Massiah, A. (eds), Composites Testing and Standardization ECCM-CTS, pp. 385–394, European Association for Composite Materials.

16.

Hashemi, S. , Kinloch, A.J. and Williams, J.G. (1989). Corrections Needed in Double Cantilever Beam Test for Assessing the Interlaminar Failure of Fibre-composites , Journal of Materials Science Letters, 8: 125–129 .

17.

Naik, R.A. , Crews Jr. , J.H. and Shivakumar, K.N. (1991). Effects of T-tabs and Large Deflections in DCB Specimen Test, In: O'Brien, T.K. (ed.) Composite Materials, Fatigue and Fracture ASTM STP 1110, 169–186.

18.

O'Brien, T.K. and Martin, R.H. (1993). Results of ASTM Round Robin Test for Mode I Interlaminar Fracture Toughness of Composite Materials , Journal of Composite Materials and Research, 15: 269–281 .

19.

ASTM D 5528 , Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fibre-reinforced Polymer Matrix Composite, Annual Book of ASTM Standards, 14.02, pp. 272–281.

20.

Akay, M. , Kong, A.H. , Mun, S. and Stanley, A. (1995). Fracture Toughness and Impact Behaviour of Glass-fibre Reinforced Polyamide 6 Injection Mouldings , Composites Science and Technology, 55: 109–118 .

21.

Carlsson, L.A. and Gillespie, J.W. (1989). Mode II Interlaminar Fracture of Composites. Applications of Fracture Mechanics to Composite Materials, pp. 135–144, Elsevier Science Pub .

22.

Davies, P. (1993). Protocols for Interlaminar Fracture Testing of Composites, European Structural Integrity Society Polymers & Composites Task Group.

Moisture Effect on the Interlaminar Resistance of Woven Fabric Thermoplastic Composite

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