For the beam illustrated (see attachment), determine the dimension b for which the maximum normal stress due to bending is 40 MPa.
a) 7.45 mm
b) 8.95 mm
c) 8.33 mm
d) 9.36 mm© BrainMass Inc. brainmass.com October 9, 2019, 8:46 pm ad1c9bdddf
We know that section modulus of the rectangular section
Z = bd2/ 6 = b3/6
Normal stress / bending = M / Z
For a give beam, the stress of bending is found in a Word attachment.