This article established a finite element model of an axisymmetric Type Ⅳ gas cylinder,analyzed the stress state and sealing effect of the local sealing structure of Type Ⅳ gas cylinders with different liner constitutive relationships under an internal pressure of 70 MPa,and discussed the influence of liner constitutive relationships on the structural strength of Type Ⅳ gas cylinders.The results showed that when three constitutive relationships were used,the top of the cylinder head was the weak point of stress concentration,and the cylinder was uniformly stressed in the circumferential direction.The maximum Mises stress,maximum strain,and maximum contact pressure all appeared at the lower protruding end of the sealing port.Among them,when using secant and test constitutive relationships,the cylinder could meet the sealing requirements,while when using linear constitutive relationships,the cylinder groove structure was damaged.However,the stress of the remaining structure was lower than the material fracture strength,which could still ensure the strength requirement.
Type Ⅳ cylinderPlastic linerConstitutive relationLocal sealing structure
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