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Hi Fellow engineers, If you run a buckling analysis and you want to use the buckling mode. To introduce a small buckling perturbation. Where do you have to look at? Eigenvalue and/or Eigenmodes? Is the (negative)frequency of any importance? Thanks in advance.

Hi Fellow engineers, If you run a buckling analysis and you want to use the buckling mode. To introduce a small buckling perturbation. Where do you have to look at? Eigenvalue and/or Eigenmodes? Is the (negative)frequency of any importance? Thanks in advance.

Hi "SWComposites", non-linear material properties and the mode is a symmetrical outward buckling mode. But if a numerical round-off or a geometric imperfection is causing buckling, who can simulate the approximation with FEM?.... BuckTU.

Hi "SWComposites" I'm running a non-linear analysis, it is a short thick pipe. "SWComposites", Do you have any MSC.MARC experience? Hope I gave you enough info on the type of FEM model I’m running. Thanks in advance Nabil

Oké, so only gwolf agrees that if a perfect pipe will compress in a flat disk... [COLOR=red]but does someone know why a FEM program doesn't do this?[/color red] Without referring to any Euler or eigen value problems. What is the background of a FEM program, according to the pipe to disk...

Dear FEM users, I have made a pipe FEM model from solid elements in Msc.Marc. If I axially compress this pipe, it will buckle. But if you thick about it…How does this FEM program know this? This perfect pipe in FEM has a uniform geometry and material properties. This FEM model will only be...

Hee Fellow engineers, I would like to know if someone ever used the Chaboche model in FEM, preferably MSC.MARC. I want to use the bauschinger effect in my FEM models. Thanx BuckTU

BuckTU (Mechanical) 29 Jun 05 12:27 Hi fellow engineers, API C95 steel is what I'm trying to model. Does anyone have Ramberg_Osgood coefficients of C95 steel? These are hard to come by, because not very many people use the strain hardening. Or is there someone who has API C95 hardening...

Hi fellow engineers, API C95 steel is what I'm trying to model. Does anyone have Ramberg_Osgood coefficients of C95 steel? These are hard to come by, because not very many people use the strain hardening.Or is there someone who has API C95 hardening curves.. Eitherway Thanx, BuckTU

If somebody has usable coefficients for FEM analysis..

Hi fellow engineers, Does someone have Ramberg-Osgood coefficients of 304L stainless steel or equivalent plastic strain curves? Or does anybody know where I can find good references. BuckTU

I'm using Msc.marc for a while now. What I've heard is that it is mainly used in the aircraft and automotive industry, but it has extensions to other areas. It is a good tool for non-linear calculations and has even got the capability to simulate a manufacturing process. Otherwise you have to...

Thanks for the quick reply, but what I meant is, "What does the program do to simulate the initiation of the displacement", because if you would apply a displacement axially then the Cylinder will buckle in the Numerical program with a wave mode. But why doesn't the Cylinder compress it into a...

Hi Fellow engineers, my question is short, but not simple. "Why does a numerical cylinder, without any imperfections, buckle in the FEM program MSC.Marc with axial compression?" I've worked with axial buckling and FEM programs for a long time now, but didn't ask this question to myself...

Try to use a static loadcase type with arc lenght adaptive, if you are using constant time steps. Otherwise you have to explain what kind of FEM appraoch you're taking to give us the tools to see what your doing "wrong".

Hi fellow Engineer, this question (two parts) concerns buckling of "Thick-walled pipe/cylinders" under axial compression. (First)Could someone tell/explain me what the difference is between small- and large-deflection theory Or where I can find it on the-internet, because the papers/books...

Dear MikalT, Your question will have more effect, if you make your own thread, because it will show-up at NEW threads and not the old ones...Its a Tip. And what do you mean with "span pipe"? BuckTU.

Thanx Dave (CESSNA1), But, has anyone investigated the Incremental and Deformation Theory concerning wrinkling or buckling of thick walled cylinders?? And could someone tell me were I can find material, because most researches mention it, but they do not explain it. BuckTU

Hi fellow Engineer, this question (two parts) concerns buckling of thick-walled pipe/cylinders under axial compression. An answer will vanish my engineering-blok... (First)Could someone tell/explain me what the difference is between small- and large-deflection theory Or where I can find it on...