Abstract
The yield strength of liner material affecting the performance of CNG-II composite cylinder was studied by finite element method (FEM) analysis. The yield strength of liner material 30CrMo was changed from 730MPa to 850MPa with seven strength. The tensile strength of liner material, structural parameters of CNG-II composite cylinder and winding parameters were fixed as the yield strength of liner material changing. The auto-frettage effects of CNG-II composite cylinder became worse and the fatigue life of CNG-II composite cylinder lowered with the increasing of liner yield strength. The yield strength of liner should be lowered to some extent for improving the performance of CNG-II composite cylinder in the production of CNG-II composite cylinder.
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