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 The transverse cracks and delaminations provide the leakage path through

composite laminates and thus directly related to the permeability. For the laminated

composite specimen, the microscopic results showed that transverse crack propagation

and delaminations of composite laminates. For the textile composite specimen, the

transverse cracks propagation was not observed, which resulted low permeability of

textile composites even after cryogenic cycling.