Question: Solve Prob. 441 using Castiglianos theorem. Since Eq. (418) for torsional strain energy was derived from the angular displacement for circular cross sections, it is

Solve Prob. 4€“41 using Castigliano€™s theorem. Since Eq. (4€“18) for torsional strain energy was derived from the angular displacement for circular cross sections, it is not applicable for section BC. You will need to obtain a new strain energy equation for the rectangular cross section from Eqs. (4€“15) and (3€“41).
Prob. 4€“41, The cantilevered handle in the figure is made from mild steel that has been welded at the joints. For Fy = 200 lbf, Fx = Fz = 0, determine the vertical deflection (along the y axis) at the tip. Use superposition.

See the discussion on p. 102 for the twist in the rectangular cross section in sectionBC.

in I-in dia. y-in dia in I5 in S in 6 in

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