【作者】 陈泽鸿； 惠虎； 施锋萍； 黄淞； 杜张子阳；

【Author】 CHEN Zehong;HUI Hu;SHI Fengping;HUANG Song;DU Zhangziyang;Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology;Shanghai Institute of Special Equipment Inspection and Technical Research;4H Hydrogenation Material Laboratory;

【机构】 华东理工大学承压系统与安全教育部重点实验室； 4H临氢材料实验室； 上海市特种设备监督检验技术研究院；

【摘要】 4130X作为内胆用钢广泛用于钢内胆碳纤维环向缠绕储氢容器,其在高压氢环境下面临着因高压氢脆引起的断裂韧度下降,严重威胁容器的安全运行。本文开展了国产4130X在空气和100 MPa氢环境下的断裂韧度试验,获得其在100 MPa氢环境下的断裂韧度为31.8 MPa·m^0.5。以获得的材料性能参数为基础,采用断裂力学方法对环向缠绕容器进行脆断评判,探究得到当假想裂纹深度为0.8倍壁厚时,其满足未爆先漏所需的断裂韧度为176 MPa·m^0.5,并进一步建立了在不满足未爆先漏条件下该容器不同断裂韧度与最终允许裂纹深度间的关系曲线,为合理确定环向缠绕容器内胆用钢在高压氢环境下的断裂韧度提供了技术支撑。更多还原

【Abstract】 4130 X steel is widely used as liner material in hydrogen storage vessel with steel lined and carbon fiber hoop wrapped,faces fracture toughness degradation under 100 MPa hydrogen pressure due to hydrogen embrittlement,which seriously threatens vessel safety.We conducted fracture toughness tests under air and 100 MPa hydrogen environment,obtained the fracture toughness of 4130 X under 100 MPa hydrogen environment is 31.8 MPa·m^0.5.Based on these material parameters,we performed brittle fracture assessment for a typical hoop wrapped vessel using fracture mechanics methodology.The results we obtained demonstrate the material requires minimum toughness of 176 MPa·m^0.5 to satisfy leak-before-break（LBB） criterion when the assumed crack depth is 0.8 times wall thickness.We further established correlation curves between fracture toughness and allowable final crack depth when LBB condition remains unsatisfied.This study in this paper provides technical guidance for rationally determining the fracture toughness requirements of steel for hoop wrapped composite vessel liner in high pressure hydrogen environment.更多还原