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December 11th, 2016, 10:54 AM   #1
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From: huddersfield

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Bending stresses

problem statement:
The second moment of area of the beam shown about the neutral axis X X is 4x10^6mm^4 Find the maximum bending stresses, tensile and compressive, set up in a beam of this section 2.6m long and simply supported at its ends and carrying a concentrated load of 4.8kn at its mid point, the weight of the beam may be ignored
Unable to load the picture of this beam, it is a t shaped beam with the neutral axis XX running through the centre of the beam horizontally and 40mm from the top of the beam, it also has an overall height of 120mm

Relevant equations
M/I = E/R = σ/y

The attempt at a solution
As far as I am aware I need to use σ/y = m/I to find the correct answer, y = 40mm (distance from neutral axis) I= 4x10^6mm^4 (second moment of area) I am unsure about which values or how to work out either σ or m
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