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Which consequence arises when cooling carbon fiber composites near absolute zero?

A)Increase in hydrogen bond crosslinking
B)Resin micro-cracking and delamination
C)Enhanced covalent bond rigidity
D)Promotion metallic bond character

💡 Explanation

At cryogenic temperatures, differential thermal contraction causes resin micro-cracking because the epoxy matrix shrinks significantly more than the carbon fibers. Therefore, interlaminar shear stresses exceed the material strength, triggering delamination, rather than hydrogen bond alterations influencing structure differently.

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