形状記憶合金ワイヤを用いたCFRP製圧力容器の破裂圧力向上と最適設計

概要

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CFRP pressure vessels are now widely used in compressed natural gas vehicles (CNGV) and have a possibility to be employed in fuel cell vehicles (FCV) for highly compressed Hydrogen. In order to increase a driving distance in CNGV and FCV, lighter vessels proofed against higher pressure are required. In the case of internal pressure, the tensile circumferential stress at the inner radius should be decreased in order to increase the burst pressure. This paper presents a method how to increase the burst pressure of CFRP vessels. For increasing the burst pressure of CFRP vessels, the shape memory alloy (SMA) wire memorized a compressive stress is wound around the outer surface of cylindrical part of the CFRP vessel. When the internal pressure acts on the CFRP vessel, its tensile circumferential stress can be reduced by being received the compressive stress of the SMA wire and the experimental results of increasing the burst pressure are shown. The experimental results are compared with numerical ones and they agree well each other. Furthermore, optimum design of CFRP pressure vessels by the change of winding method of SMA wire is numerically obtained.
2006-04-25