고체역학 (Beer) — Pure Bending: Problem 4.152

4.152 The Z section shown is subjected to a couple $M_0$ acting in a vertical plane. Determine the largest permissible value of the moment $M_0$ of the couple if the maximum stress is not to exceed 80 MPa. Given: $I_{max} = 2.28 \times 10^{-6} \text{ m}^4$, $I_{min} = 0.23 \times 10^{-6} \text{ m}^4$, principal axes $25.7^\circ \angle$ and $64.3^\circ \angle$.