Finding yield strength with a load/displacement curve

[Ferdiss]

Hi! I have done a simulation where I got out the load/displacement curve of a steel beam that is simply supported with an equally distributed load across the whole length (10 m). I want to field the point at which the steel yields. I am used to use the 0,2% value on a stress/strain curve, but how do I do it at a load/displacement curve? I have the units N on y-axis and m on x-axis.

Is it correct to say that strain is displacement(in z-direction, in the lateral direction of the beam) / l0(10 meters) ? Even though the displacement is in 'another direction' than the beam length?

So strain = 0,002 * 10 meters = 0,02 m?

Thank you!

 

[Lnewqban]

Welcome, @Ferdiss !

Sorry, I can't understand your description of the task at hand.
Do you have any specification of material and type of that beam?

 

[Ferdiss]

Hi, it is a steel beam S355. A simply supported beam with a uniformly distributed load :)

 

[Lnewqban]

Please, see:
https://mathalino.com/reviewer/mech...tion-to-problem-606-double-integration-method

https://mathalino.com/reviewer/mechanics-and-strength-of-materials/chapter-6-beam-deflections