Abstract
The vacuum thermocycling in the temperature interval of 93-413 K under vacuum of 10 −5 Pa was performed for unidirectional M40J/AG-80 com- posites, and changes in the bending strength and modulus, the mass loss ratios, the surface morphology and the internal structure transitions were examined. Ex- perimental results show that with increasing the vacuum-thermal cycles, both the bending strength and modulus exhibit an increase trend followed by decreasing after 40 cycles and leveling off after 97 cycles. The mass loss ratio increases firstly and then tends to level off after 48 cycles. The vacuum thermocycling could cause the debonding in the interfacial layers between the AG-80 epoxy matrix and car- bon fibers, as well as the post curing in the epoxy matrix. The changes in the bending strength and modulus, the mass loss ratio and the surface morphology of the M40J/AG-80 composites can be related to the debonding and the post curing due to the vacuum thermocycling.
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