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*Department of Precision Mechanical Engineering, Pusan National University, Busan, Korea**Pusan Educational Center for Computer Aided Machine Design, Pusan National University, Busan, KoreaKEY WORDS: Windpower system structure  , Composite shell  , Ply orientation , Lamination pattern , FEM  ABSTRACT: The purpose of this study was to develop a buckling analysis te chnique for a windpower system structure under environmental loadings (hydrostatic pressure) using FEM. We analyzed an isotr opic material and composite material and made a comparison usin g buckling pressure formulas. First, finite element analyses for an isotro pic material (SC410) were performed to obtain the variation of buckling pressure for the number of elements and boundary conditions in a pressure-sh ell model, and the numerical results were compared with those o f existing empirical formulas. Then, additional finite element analyses ba sed on the results of the isotropic material (SC410) were perfo rmed to determine the optimum lamination angle and pattern for a composite material (URN300). The results of the FE analyses for the composite mater ial were also compared with those of existing empirical formulas. The ply ori entations (lamination angles) used in the FE analyses were 0 °, 15°, 30°, 45°, 60°, 75°, and . The lamination patterns in the FE analyses were and . T he lamination pattern was assumed to be the equivalent model of . The results of the FE analyses for the isotropic material (SC410) indicated that the optimal values for the number of elements and the bou ndary conditions were 6000 and both simply supported, respectively. The results of the FE analyses for the composite material (URN300) showed t hat the optimal ply orientation was 60°~75° :     30, 051-510-1665, chhong@pusan.ac.kr

Study on Numerical-analysis Technique for Windpower System Structure under Environmental Loadings