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Maximum Normal Stress Due to Bending

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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

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Solution Summary

For a give beam, the stress of bending is found in a Word attachment.

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Solution

We know that section modulus of the rectangular section

Z = bd2/ 6 = b3/6

Normal stress / bending = M / Z

...

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