A laminated plastic beam of square cross section is built up by gluing together three strips, each 10 mm x 30 mm in cross section (see figure). The beam has a total weight of 3.2 N and is simply supported with span length L = 320 mm. Considering the weight of the beam q, calculate the maximum permissible load P that may be placed at the midpoint if (a) the allowable shear stress in in the glued joints is 0.3 MPa, and (b) the allowable bending stress in the plastic is 8 MPa. Include A. Complete solution B. Free body diagram C. Shear diagram D. Moment diagram

Q: Good afternoon!  May I know where is the part of b) 4 mpa. Thank you!

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