J0320201 Effect of Autofrettage on Impact Damage in CFRP Composite Cylinders

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  • J0320201 CFRP複合圧力容器の衝撃損傷に及ぼす自緊処理の影響

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Today, CFRP composite vessels are used as fuel containers of CNG (Compressed Natural Gas) vehicles and fuel-cell vehicles. It is known that material property and fatigue life of CFRP composite vessels are seriously reduced by out-of-plane loading. Also, autofrettage treatment for the improvement of the fatigue life is conducted on composite vessels. The main objective of this study is to evaluate effects of autofrettage on damage behavior subjected to impact loading. Composite vessels used in this study consisted of aluminum liner fully wrapped by carbon/epoxy, which were fabricated by filament winding method. Impact tests and damage observation were performed on the composite vessels with and without autofrettage. Internal pressure test were also conducted after impact tests, and to investigate residual strength. As a result, absorbed energy of composite vessels with autofrettage became smaller than composite vessels without autofrettage. In composite vessels with autofrettage, delamination was suppressed, and residual burst strength became larger. It was clarified that CFRP composite vessels with autofrettage were superior in the impact resistance.

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