Consider a torsional bar having rectangular cross section of width 4a and depth 2a. Div...

Consider a torsional bar having rectangular cross section of width 4a and

depth 2a. Divide the cross section into equal nets with h=a/2. Assume

that the origin of coordinates is located at the centroid. Find the shear

stresses at points Use the direct finite difference

approach. Note that the exact value of stress at is, from Table 6.2, T_max=