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Re: How can I calculate the maximum force which doesn't make a plastic deformation with an arbitary FOS
James Riddell Sep 29, 2014 4:21 PM (in response to Alex Aan)1 person found this helpfulAlex,
Very simply put  as long as no stress is higher than half of your material yield stress value for that part then your Safety Factor is >= 2. FEA doesn't need UTS or YS to run a linear study, just E & nu.
If I can read your screen shot correctly it looks like you have 2 MPa of stress max. That's less than 300 psi.

Re: How can I calculate the maximum force which doesn't make a plastic deformation with an arbitary FOS
Mike Pogue Sep 29, 2014 4:58 PM (in response to Alex Aan)1 person found this helpful Put an arbitrary load on the model (F1).
 Calculate the factor of safety (FS1) using that load.
 Choose you desired factor of safety (FS2), you say this is 2.
 Calculate the max load (F2) for FS = 2 using the following formula (which I am going to win a Nobel prize in bracketry for)
F2 = F1*FS1/FS2
Subject to the usual caveats about convergence and you need to understand about blah blah blah...

Re: How can I calculate the maximum force which doesn't make a plastic deformation with an arbitary FOS
Jared Conway Sep 29, 2014 7:14 PM (in response to Alex Aan)1 person found this helpfuljames and mike's answers are definitely the defacto answer.
but maybe here's a good question, what do you see in the results.
and can you reiterate where you are stuck about getting to your "design point"?