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← ScienceWhich 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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