A bar made up of two square sections , one of steel and the other of aluminium is shown in Fig.2 The bar is acted upon by a compressive force P. Determine the value of P if the total decrease in length of the bar is 0.3 mm . Take Esteel = 205 GPa and Ealuminium = 75 GPa .

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A: Given data:

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A: Calculate the extension of the bar (△L)

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Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.