A compound bar of length 600 mm consists of a strip of aluminium 40 mm wide and 20 mm thick and a strip of steel 60 mm wide × 15 mm thick rigidly joined at the ends. If elastic modulus of aluminium and steel are 1 × 105N/mm2and 2 × 105N/mm2, determine the stresses developed in each material and the extension of the compound bar when axial tensile force of 60 kN acts
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