初期不整を有する複合材料積層板の圧縮座屈強度

概要

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In recent years the use of advanced composite materials as structural members has increased in various fields,because of their high specific strength and stiffness.One of the ctiteria for designing thin-walled structures is buckling stress under compressive loads.Usually,thin-walled laminated plates keep a stability condition after primary buckling.However,under continually increasing compression load,the equilibrinm state of the plates changes to a state of higher buckling mode.The post-buckling behavior of thin laminated plates under axial comression has been discussed by many researchers.However,few studies have been performed on the secondary buckling phenomenon for thin laminated plates which occurs with a further increase in loading.In this paper,the stability condition of carbon fiber/epoxy (CERP) cross-ply laminated plates with initial imperfections under uniaxial comperssion,which is simply supported along four edges,is determined using the second variation of the total potential energy.The occurrence of secondary buckling is proved analytically and the effects of various factors,such as initial imperfection,average axial shortening,post-buckling deflection pettern are discussed.
1993-07-15