A mechanism used in printing machinery consists of a helical spring which is having a wire diameter of 5mm and an outside diameter of 60mm. The spring has 12 active coils. If the permissible shear stress of the spring material is 335 N/mm2 and the Modulus of rigidity is 81 kN/mm2.  a) Calculate the axial load in N and the deflection of the spring in mm, neglecting the effect of curvature.       b) Calculate the value of axial load in N considering the effect of curvature.

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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.