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ckkt91
Posts: 2
Registered: ‎09-05-2013

Can we simulate crushing in the critical buckling load analysis?

248 Views, 2 Replies
09-19-2013 07:23 AM

Hi

 

I am trying to run a buckling analysis and I am getting results of the bucking load mutiplier which increase exponentially as I decrease the slenderness ratio. I want to know if the crushing properties of the material are incorporated into this environment, or are they not?

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Valued Mentor
AstroJohnPE
Posts: 503
Registered: ‎08-30-2012

Re: Can we simulate crushing in the critical buckling load analysis?

09-19-2013 08:09 AM in reply to: ckkt91

Hi ckkt91,

 

I do not know exactly what you mean by "crushing properties", but the answer is no if you are performing a "Linear > Critical Buckling Load" analysis type. You can also verify this by looking at the material properties. If there is no input for the crushing property, then there is no calculation for it other than normal compression. It also depends on the element type. A beam element is just a line, so there is no calculation for buckling of the flange, for example.

 

If my memory is half-way correct, the Euler formula for buckling gives that the force is proportional to 1/(slenderness ratio)^2, so you results seem right to me.

 

If you use the nonlinear analysis type, then crushing may be possible depending on the material model. The material model controls what material properties are needed and what calculations are included in the analysis. But nonlinear is unlikely to give a straight buckling load. You need to decide what constitutes buckling and watch for that result to occur.

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

16 years experience with Simulation Mechanical
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New Member
ckkt91
Posts: 2
Registered: ‎09-05-2013

Re: Can we simulate crushing in the critical buckling load analysis?

09-19-2013 01:18 PM in reply to: AstroJohnPE

Thank you so much!

 

 

Are you talking about MES with non linear material models? If I ensure through theoretical calcuations that the slenderness ratio for that model is good enough for crushing (and not buckling) for that particular material, it should give me the stress at which it crushes?

 

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