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AbstractCFRP composite material has the superior specific strength and rigidity compared to metallic materials, and is widely adopted in the various fields. However, CFRP composite material has the weakness in hygrothermal and crash environment. Especially, moisture ingress into composite material under hygrothermal environment can change molecule arrangement and chemical properties. In addition, interface characteristics and material component properties can be degraded. A collapse experiment has been made to research the differences of absorbed energy and deformation mode between absorbed specimens of moisture and non-moisture. As a result of this study, the effect of moisture absorption and impact loads of about 3050% reduction in strength are shown. Key Words : CFRP(  ), Interface numbers(), Hat shaped sectional members( ), Hygrothermal(), Moisture absorption(), Impact collapse(), Absorbed energy() 1.   (Carbon Fiber Reinforced Plastics,  CFRP)        ,

Strength Evaluation of CFRP Hat-shaped Sectional Members Due to Variation of Collapse Conditions Under Hygrothermal Environment