Study on degradation mechanism of long-term strength of carbon fiber reinforced plastics under wet condition

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The influence of water absorption on temperature dependent strength of unidirectional CFRP was studied. Unidirectional CFRP were treated under the two conditions; Dry and Wet. The strengths for typical four directions of unidirectional CFRP were measured under various temperatures at a single loading rate for Dry and Wet specimens. The four directions were longitudinal tension and bending, transverse bending and compression, respectively. The influence of water absorption on long-term durability was evaluated by accelerated testing methodology based on the time-temperature superposition principle which holds for the vescoelastic behavior of matrix resin. As results, it can be clarified that the long-term durability in these four directions of unidirectional CFRP decrease with an increase in temperature and water absorption and that strongly depends on the viscoelastic behavior of matrix resin and the failure mechanism.