Solution to Problem 690 | Beam Deflection by Method of Superposition

Problem 690
The beam shown in Fig. P-690 has a rectangular cross section 50 mm wide. Determine the proper depth d of the beam if the midspan deflection of the beam is not to exceed 20 mm and the flexural stress is limited to 10 MPa. Use E = 10 GPa.

Figure P-690 simple beam under the action of two point loads


Solution 690

Your shear diagram is incorrect, the min shear should be -320N-m not -380N-m