Evaluation Test of Cryogenic Properties of CFRP Domed Element

Abstract

The requirement to minimize weight of a reusable rocket is so severe that the weight savings achievable by developing lightweight components in the secondary structures are significant. The purpose of this study was to develop lightweight components using composite materials such as CFRP (Carbon Fiber Reinforced Plastic) for cryogenic propellant feed lines, valves and tanks. We fabricated CFRP domed elements with a radius of 121 mm and evaluated their cryogenic properties including helium permeation dependency on temperature. The helium permeation rate increased drastically with a decrease of temperature, but no evidence of damage was observed after the temperature recovered from the cryogenic condition.