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modified Riks method (collapse)

modified Riks method (collapse)

modified Riks method (collapse)

(OP)
I cannot seem to get my models to collapse in the viewer.  The modified Riks method seems to stop short of global buckling (or even partially buckling).  Any suggestions?     

RE: modified Riks method (collapse)

What kind of structure is it that you evaluate?

RE: modified Riks method (collapse)

(OP)
It is a 30" diameter plastic pipe.

RE: modified Riks method (collapse)

How is the load applied - is it axial, bending, torsion..?

Have you used a *IMPERFECTION to seed the buckling mode?

Regards

Martin Stokes CEng MIMechE

RE: modified Riks method (collapse)

(OP)
The pipe is surrounded by soil and the load is a pressure load applied from above.  Yeah I use a buckle step to seed the buckling mode.  I seem to get the error "too many attempts made for this increment."

RE: modified Riks method (collapse)

Try
*CONTROLS, ANALYSIS=DISCONTINUOUS
in that step.

RE: modified Riks method (collapse)

(OP)
Thank you for the suggetion to run a discontinous solution, but it did not even result in an extra increment.  Any other suggestions?

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