LNG cryogenic composite hoses have advantages such as high strength,lightweight,and good flexibility,which can meet the transportation needs of LNG under harsh sea conditions.However,they face fatigue failure problems due to their complex structure and various coupled load effects.Firstly,a finite element model of LNG cryogenic composite hoses was established to study the mechanical response and bending fatigue life characteristics of composite hoses under bending and internal pressure loads.Then,parameters such as the diameter of spiral steel wire,pre-tightening spacing,pitch,fiber layers,and friction coefficient were varied to perform parameterized analysis of the bending fatigue life of the hoses.The results indicate that pre-tightening spacing,pitch,and fiber layers significantly affect the fatigue damage of composite hoses:when the pre-tightening spacing increases,the fatigue damage of composite hoses first increases and then decreases;reducing the pitch or increasing the number of layers will significantly reduce the fatigue damage of composite hoses;the friction coefficient has almost no effect on fatigue damage.The research findings can provide theoretical reference for the structural design of cryogenic composite hoses.
维普
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