An analysis method was proposed for the load bearing performance of pressure vessels that takes into account the ply thickness of the composite winding layer based on the classical laminate plate stiffness equivalent theory.A comparison with actual layup finite element models was carried out,which verifies the effectiveness of the analysis method.Uniaxial tensile tests were conducted on different ply thicknesses of the composites to obtained the relationship between material strength and ply thickness.The stress distribution,failure coefficient distribution,and failure pressure of ultra-thin-ply composite wound pressure vessels were analyzed.Results show that both the stress and damage distributions of ultra-thin-ply composite wound pressure vessels are more uniform,with a 54.5%increase in failure internal pressure compared to standard ply thickness composites.Research results provide a reliable theoretical reference for the structural design of ultra-thin-ply composite wound pressure vessels.
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