고체역학 (Beer) — Torsion: Problem 3.143

3.142 and 3.143 A hollow member having the cross section shown is formed from sheet metal of 2-mm thickness. Knowing that the shearing stress must not exceed 3 MPa, determine the largest torque that can be applied to the member. [Figure P3.143 shows an L-shaped hollow section with outer dimensions of 50 mm x 50 mm and leg widths of 10 mm.]