연료전지차량용 TYPEⅢ 수소저장용기 복합재층의 응력 및 균열 평가에 관한 연구

Abstract

In order to lead the globalization of fuel cell vehicles, it is necessary to ensure the safety of high pressure hydrogen storage vessel. The cracks in the CFRP layer of the vessel are directly connected to the safety of the TYPE Ⅲ high pressure vessel. The purpose of this study is to compare the stress distributions in a friction contact condition with perfect bonding of liner and composite layers, and to evaluate crack behaviors as the weak point of TYPE Ⅲ high pressure hydrogen vessel by using a ply modeling method and XFEM. The failure criteria was determined by the maximum principal stress and displacement that excess the allowable tensile strength considering fiber and transverse direction of each ply. Results of the study show the friction contact condition is reasonable and the weak point of CFRP composite layers was occurred to the transverse direction at the 17th and 35° winding ply in the boundary of the dome and cylinder. The crack extension was obtained in the base of the weak transverse allowable stress at 35° helical winding. The results will be usefully applied to ensure the safety of the high pressure hydrogen vessel.