A second unidirectional composite also comprises aligned continuous fibres in an epoxy matrix but with carbon fibres at a volume fraction of 0.25 and glass fibres at a volume fraction of 0.25. Calculate the percentage of the stress carried by (i) glass fibres and (ii) carbon fibres just prior to any fracture. Estimate the longitudinal tensile fracture stress of this composite. Material Young modulus/ Poisson ratio Tensile strength/ GPa MPa Carbon 300 0.10 2100 Glass 72 0.22 1800 Ероху resin 4 0.40 120

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Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.