Gas Leakage Evaluation of CFRP Cross-ply Laminates under Biaxial Loadings

Abstract

In this study, leak characteristics of CFRP (carbon fiber reinforced plastic) cross-ply laminates are experimentally investigated under biaxial loadings using a specially prepared in-plane biaxial testing system. Permeability through the damaged laminate under biaxial stresses was measured with a leak detection system. In order to evaluate the effect of damage on leakage, ultrasonic C-scan was used to inspect the matrix cracking in the specimens. Experimental results reveal that leakage through the damaged laminate is in correlation with the amount of damage and depends not only on load level but also on biaxial load ratio. Leak analysis, which had been previously developed, was employed and calculations of permeability were in good agreement with the experimental data. The results indicate the validity of the assumption of domination of crack openings on permeability, and the dependency of constants of leak conductance on damage susceptibility in the leak analysis.

Keywords

CFRP laminates propellant leakage permeation matrix crack biaxial stress cruciform specimen leakage analysis cryogenic tank

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References

Cook, S. (1996). The X-33 Advanced Technology Demonstrator , In: 7th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, AIAA Conference Paper 96-4563, Norfolk, VA, 18–22 November 1996.

Marshall Space Flight Center (May 2000). Final Report of the X-33 Liquid Hydrogen Tank Test Investigation Team, NASA .

Aoki, T. , Ishikawa, T. , Kumazawa, H. and Morino, Y. (2001). Cryogenic Mechanical Properties of CF/Polymer Composite for Tanks of Reusable Rockets , Advanced Composite Materials, 10(4): 349–356 .

Schoeppner, G.A. , Kim, R. and Donaldson, S.L. (2001). Steady State Cracking of PMCS at Cryogenic Temperatures , In: 42nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Conference Paper 2001-1216, Seattle, WA, 16–19 April 2001.

Okada, T. , Nishijima, S. , Fujioka, K. and Kuraoka, Y. (1988). Gas Permeation and Performance of a FRP Cryostat , Advances in Cryogenic Engineering, 34: 17–24 .

Disdier, S. , Rey, J.M. , Pailler, P. and Bunsell, A.R. (1998). Helium Permeation in Composite Materials for Cryogenic Application , Cryogenics, 38(1): 135–142 .

Morino, Y. , Shimoda, T. , Morimoto, T. , Ishikawa, T. and Aoki, T. (2001). Applicability of CFRP Materials to the Cryogenic Propellant Tank for Reusable Launch Vehicle (RLV) , Advanced Composite Materials, 10(4): 339–347 .

McManus, H.L. , Faust, A. and Uebelhart, S. (2001). Gas Permeability of Thermally Cycled Graphite-Epoxy Composites , In: 16th Technical Conference of the American Society for Composites, Paper 087, Blacksburg, VA, 9–12 September 2001.

Robinson, M.J. , Eichinger, J.D. and Johnson, S.E. (2002). Hydrogen Permeability Requirements and Testing for Reusable Launch Vehicle Tanks , In: 43rd AIAA/ASME/ASCE/ AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Conference Paper 2002-1418, Denver, CO, 22–25 April 2002.

10.

Kumazawa, H. , Aoki, T. and Susuki, I. (2003). Analysis and Experiment of Gas Leakage through Composite Laminates for Propellant Tanks , AIAA Journal, 41(10): 2037–2044 .

11.

Roy, S. and Benjamin, M. (2003). Modeling of Damage in Graphite/Epoxy Laminates for Cryogenic Fuel Storage , In: 18th Technical Conference of the American Society for Composites, Paper 138, Gainsville, FL.

12.

Rivers, H.K. , Sikora, J.G. and Sankaran, S.N. (2002). Detection of Hydrogen Leakage in a Composite Sandwich Structure at Cryogenic Temperature , Journal of Spacecraft and Rockets, 39(3): 452–459 .

13.

Yokozeki, T. , Aoki, T. and Ishikawa, T. (2003). Gas Permeability of Microcracked Laminates under Cryogenic Conditions , In: 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Conference Paper 2003-1604, Norfolk, VA, 7–10 April 2003.

14.

Whitcomb, J.D. (1992). Analysis of Delamination Growth near Intersecting Ply Cracks , Journal of Composite Materials, 26(12): 1844–1858 .

15.

Aoki, T. , Kumazawa, H. and Susuki, I. (2002). Propellant Leakage through Laminated Structures , In: 17th Technical Conference of the American Society for Composites, Paper 063, West Lafayette, IN.

16.

Noh, J. and Whitcomb, J.D. (2003). Prediction of Delamination Growth and Opening near Intersection of Transverse Matrix Cracks and Delamination , In: 44th AIAA/ASME/ASCE/ AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Conference Paper 2003-1602, Norfolk, VA, 7–10 April 2003.

17.

Henaff-Gardin, C. , Lafarie-Frenot, M.C. and Gamby, D. (1996). Doubly Periodic Matrix Cracking in Composite Laminates Part 1: General In-Plane Loading , Composite Structures, 36(1–2): 113–130 .