FEM And Test Study Of Buckling Performance For 2D Textile Composite Curved Panels

2D Textile composite cylindrical panels have been widely used in aviation,aerospace,shipping and civil engineering industries because of their fluent shapes and excellent bending and twisting mechanics performance.Frequently subjected to axial loads in practice,cylindrical panels tend to fail as a result of buckling.Stability is of great importance to the security and economy of structure design.In this paper,the stability of composite curved panels is studied by finite element method and test.The finite element models of composite curved panels under axial loads were built.The buckling loads and modals were obtained by the eigenvalue method and Riks method of Abaqus.Riks method was used to conduct nonlinear buckling analysis,in which eigenvalue buckling modals were introduced as the initial geometric imperfections.The influence of radius,arc length and height were analyzed,which indicates that the increase of radius leads to a decrease of buckling load,the growth of arc length results in the rise of buckling load and a larger height makes the buckling load lower.A test research of composite cylindrical panels was conducted.A simply supported fixture for curved panels was designed and 5 groups of curved panels with different shapes were tested by the fixture.The finite element results was compared to tests.A post-buckling test was conducted to study the post-buckling behaviors of composite curved panels.The numerical results agree well with the experimental results.The effects of common defects in composite cylindrical panels on buckling behaviors were studied by numerical simulations and tests.Panels with defects were modeled and fix-errors caused by defects were considered.The defects occasionally came from manufacturing process,including inclination,non-uniform thickness and warpage.Bulking loads and strain distribution of curved panels were calculated and numerical results were compared with test results.The research indicates that inclination had a great influence on the strain distribution of loaded panels and decreased critical buckling loads sharply,warpage had less effects on the strain distribution but decreased critical buckling loads greatly and non-uniform thickness had little effects on buckling behaviors of cylindrical panels.