A composite rod is 1000mm long, its two ends are 40mm2 and 30mm2 in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm2 in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GP

A composite rod is 1000mm long, its two ends are 40mm2 and 30mm2 in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm2 in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GP Correct Answer 0.196mm

P = 1000N, Area A1 = 40mm2, A2 = 20mm2, A30 = 30mm2 Length, L1 = 300mm, L2 = 500mm, L3 = 200mm E = 200GPa = 200x 1000 N/mm2 Total extension = P/E x (L1/A1 + L2/A2 + L3/A3).
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