Effect of water absorption on Charpy impact value has been studied for a carbon fiber reinforced polyimide (CFRP). The water absorption for 200,000 s lasting more than two days enhanced the impact value and softened the CFRP. The impact value was 13.4% higher than that of CFRP before treatment, although it. The water absorption also enhanced Weibull coefficient (
n), indicator of reproducibly, and the lowest impact value (
as) estimated by modified Weibull equation for safety design. Consequently, the high reliability of CFRP was confirmed even in the water absorbed envelopment.
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