Top Pressure Study And Structural Optimization Design Of PET Bottle

The deformation behavior that PET bottle exhibits in its useful life is a function of the shape, material characteristics, molding process, geometry and loading conditions. As the PET bottle wall is a thin shell of elastic-plastic material, it will be lost the cylindrical symmetry and stiffness under the axial compression load, according to shell stability theory. After that, the sidewall will quickly deviate from the equilibrium position and lose carrying capacity, and then, buckling deformation occurred. Therefore, the test of buckling load is a must in the design process of PET bottles consideration for the bottle's appearance and stacking deformation.This paper begins with the study of the mechanical properties of PET bottle sidewall. Eight sets specimens of PET bottle wall be tested. The author analyzes the modulus'relationship among different samples with 1% secant modulus as the tensile modulus. This is ready for the reliable material properties used in the finite element analysis of PET bottles.A numerical and experimental study is undertaken to investigate the buckling deformational behavior of the PET bottle compressed by axial load. Based on the ABAQUS/Explicit computer program, an explicit nonlinear analysis is implemented to calculate buckling load and stress distribution. The numerically obtained results are compared to those obtained experimentally and find that there exit a correction coefficient. The numerically calculated buckling load which multiplied by the correction coefficient will be in agreement with the experimentally measured ones.Finally, the structure optimization of PET bottles is undertaken based on the finite element analysis on the basis of depth analysis of the buckling load and buckling deformation of PET bottles under axial compression load. Moreover, according to the stress nephogram of PET bottle brought by FEA, plastic distribution of PET bottle were optimized in order to improve the PET material efficiency and reduced the weight of PET bottle, and which provides a new design ideas for lightweight design of the PET bottle.