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Stress in a beam

by thephysicsman
Tags: beam, stress
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Feb14-11, 01:18 AM
P: 89
1. The problem statement, all variables and given/known data

a) This steel beam has a quadratic cross-section (A=100mm2). The force F is 10 kN. Calculate the stress in the rod and show that this stress does not exceed the yield strength of the steel.

2. The attempt at a solution


[tex]\sigma = \frac{10000N}{0.0001m^2}=100 MPa[/tex]

I guess this is right? I'm not sure what the yield strength is. Can I calculate it from the given formulas?
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Feb14-11, 02:10 AM
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radou's Avatar
P: 3,224
The result is okay, but note that [MPa] = [N/mm^2], and not [N/m^2], i.e. you didn't need to convert A into [m^2]. I'm not sure what the expressions in the image mean - are you given a yield strength for steel?
Feb14-11, 02:24 AM
P: 89
Thanks for replying.

No, nothing else is given. It is a so-called Failure Assessment Diagram (FAD).

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