A steel bar of 50mm x 50mm in section and 150 mm length is subjected to tensile load of 300 kN along the longitudinal axis and tensile load of 500 kN and compressive load of 400 kN on the lateral faces. Determine the change in dimension of bar and the change in volume. Adopt E, = 2 × 10°N/mm? and u= 0.3.

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Laws of Equilibrium

A body is said to be in equilibrium if the system of forces acting on the body tends to keep the body at rest, in other words, there is no translation motion or net torque on the body. Under such conditions, the equilibrium conditions are to be applied to analyze the condition. The branch of mechanics that deals with this condition is known as 'statics'. Under equilibrium, there are no net forces on the body.