Engineering Tutorials

To study the UTM and perform the tensile test.

APPARATUS :- A UTM, mild steel specimen, vernier caliper/micrometer, dial gauge & graph paper.

THEORY :- Various m/c and structure components are subjected to tensile loading in numerous application. For safe design of these components, there ultimate tensile strength and ductility one to be determine before actual use. Tensile test can be conducted on UTM.

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1. Three vertical wires in the same place are suspended from a horizontal support. They are all of the same length and carry a load by means of a rigid cross bar at their lower ends. One of the wires is of copper and the two other are of steel. The load is increased and temperature changed so that the stress in each wire is increased by 10 N/mm². Find the change of temperature. E_s =205,000 N/mm², E_c = 102,000 N/mm², α_s = 11 x 10^-6/^oC, α_c = 18 x 10^-6/^oC.

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