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

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