... critical load is followed by the secondary buckling behaviour. This is illustrated in the diagram in terms of the transverse displacement, w, of the strut. From: Brush & Almroth, "Buckling of Bars, Plates, and Shells," McGraw Hill (1975) In the elastic range there is no transverse displacement and the strut remains straight. At the Euler buckling load, P = p2 EI/ L2 the strut becomes unstable and if the load is kept constant the transverse displacement goes to infinity (the strut collapses)! Compression members like columns, are mainly subjected to axial forces, the principal stress being in compression member is therefore the normal stress. Thus, when a compression member becomes longer, the role of the geometry and stiffness (Young's modulus) becomes more important. However, For a long column, which is used in this case, has buckling occurring in a way before the normal stress reaches the strength of the column material. For an ...

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