Question

Draw Shear Force and Bending Moment diagrams for the beam ACDB shown in figure where two couples are acting.

Find the ratio of deflections in the beam at locations C and D where the couples are acting.

 

1. For a closed coil helical spring under compressions illustrate the stress distribution across wire diameter.
2. Differentiate between compound and composite helical springs.
3. The spring load against which a valve is opened is provided by an inner helical spring arranged within and concentric with an outer helical spring. The free length of inner spring is 6 mm longer than the outer. The outer spring has 12 coils of mean diameter 25 mm, wire diameter 3 mm, and initial compression 5 mm when the valve is closed. Find the stiffness of the outer spring if the greatest force required to open the valve by 10 mm is 150 N.

If the radial clearance between the springs is 1.6mm, find the wire diameter of the inner spring if it has 10 coils. For both springs. G = 82,000 N/mm²