modified Riks method
modified Riks method
(OP)
For the modified Riks method, how do you know when general buckling has occurred?
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RE: modified Riks method
the force shows a pronounced dip due to buckling. If you plot an F-disp curve it should be quite easy to idenify the buckling load.
RE: modified Riks method
1. I have read that if two consecutive steps have negative eigenvalues that the first step is buckling; is there any truth to this?
2. My models are 3D what force do I plot?
RE: modified Riks method
You get the actual buckling load by multiplying the LPF by the reference load applied in the Riks step.
Never read that anywhere, do you have a link to the source?
Negative eigenvalues in a *BUCKLE analysis usually just mean that the direction of the buckling load is opposite to the applied load. In a *STATIC analysis, they can mean that a structure has reached a buckling point.
Regards
Martin Stokes CEng MIMechE
RE: modified Riks method
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RE: modified Riks method