With the continuous advancement of the carbon neutrality vision,the hydrogen energy industry in China is rapidly developing.Due to the susceptibility of hydrogen gas to"hydrogen embrittlement"in steel pipes,there are significant challenges in using steel pipes for hydrogen transportation.Fiber-reinforced composite flexible pipes have attracted much attention in the field of hydrogen transportation as non-metallic pipelines.However,the structural design and strength analysis of fiber-reinforced composite flexible pipes remain bottlenecks for industrial applications.To investigate the structural response of hydrogen delivery composite flexible pipes under internal pressure conditions,considering the isotropy and anisotropy of different layer materials,based on three-dimensional anisotropic elasticity mechanics,a mechanical theoretical model of fiber-reinforced hydrogen delivery composite pipes under internal pressure was established.The differential equations of pipe displacement were solved using mathematical methods,obtaining the stress-strain analytical solution of N-layer winding reinforcement hydrogen delivery composite pipes under internal pressure,which was consistent with the numerical calculation results of 13-layer hydrogen delivery composite flexible pipes under internal pressure.The maximum circumferential stress of the pipe occurs in the anti-permeation layer,and the reinforcement layer of the hydrogen delivery hose bears about 70%of the load.The absolute value of the radial stress decreases as the distance from the center point of the pipe section increases.The proposed mechanical behavior analysis model and solution method provide important theoretical support for the design of hydrogen delivery composite flexible pipes.
维普
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