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

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."

It is a 30" diameter plastic pipe.

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?

I meant two consecutive increments.

http://www.google.com/search?hl=en&q=14.%09Falgoust%2C+Monica+Kaeline.+%E2%80%9COn+the+Validity+of+the+Wagner+Hypothesis+in+Thin- Page 57

I have two separate questions. 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?

For the modified Riks method, how do you know when general buckling has occurred?

So eigenvalues less than 1 would suggest buckling?

Can the eigenvalue buckling analysis determine whether the load applied will cause the model to buckle?

If you did the analysis correctly; to my understanding a negative eigenvalue means the structure buckles for that applied load. If I am wrong someone please correct me.

Are you aware that the eigenvalues are actually normalized?

I am wondering the steps required in plotting the load vs. displacement or P/Pcr vs. displacement. I cannot seem to find P/Pcr to plot it in "create xy data".