Study on Mechanical Properties of Variable Cross-section Shell Structure Based on Finite Element
Shell structure has the characteristics of light and thin,high strength and strong spanning ability,but the cross-section inhomogeneity will affect its stress distribution and mechanical properties.This paper is based on finite element software to analyse the structural modes,stress and strain distribution,clarify the weak position of the structure and propose strengthening measures.The results show that:the maximum dis-placements in three directions of the variable cross-section shell structure are 0.034 2,0.033 8 and 0.035 2 mm;the maximum equivalent stress of 106 MPa occurs at the outer edge of the structure;the maximum shear force and bending moment of the shell structure are 498.98 N and142.32 N·m,which occurs in the 1/2 position between the top and the edge;the most unfavourable position of the structure is the top and near the support area of the shell;and the most unfavourable position is the top and near the support area of the shell;the most unfavour-able position is the top and near the support area of the structure.The most unfavourable position of the structure is the top of the shell and near the support area,which can be adopted by measures such as thickening and ribbing or increasing the number of supports.
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