Question: A metal plate, with its lines of symmetry shown as dash-dot lines in the two-dimensional view, is welded to a vertical metal wall (with the surface of the wall being parallel to the plane of the paper). A vertical load, F = 3000 lbf, is applied to the far end of the plate.
(a) Find the total second polar moment of area (total polar area moment of inertia) of all weldments.
J.(Hint: Use a table to simplify the calculation.)
(b) Find the maximum value of the secondary shear stress, (Τ'')max, due to torsion only.