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I don't get these buckling load ( 209 !!!!). and I habe been playing with all BC possible. and including 3D solid model. I tried to do it and I don't get the same, could you let me know what are the frequency of your model ( just for me to verify) and what is the stress for your static...

please I will aprecite it

Thanks rb1957 To be more clear: 1) Load is: newtons per unit length ( N/mm)..not pressure (let try not confuse with my original case post..let run the simple case as described before). 2) Before to run a skin model for load distribution, let set the model for as simple ring as described before...

crisb, Could you let me know what are your constrains for your model. did you modeled as a full 360 Degree model?. Which one is your software?.

software is mechanica from proe WF4. element a beam element with 25x25 section.

How to calcuale the in-plane and out-plane buckling factor for s simple solid ring under external pressure?.

Thanks all. Sorry if I mix up some numbers. Let fix the case for future reference to R= 1000 mm . Square section: 25x25 mm I: 32552 mm4 Yes, material is steel E=193053 N/mm Load case: unitary external force 1 N/mm (since my benchmark model is beam element) Timoshenko buckling pressure: 18.85...

Does any body know the equation for the buckling modes for a solid ring under external pressure. inplane and outplane modes? related forum: http://www.eng-tips.com/viewthread.cfm?qid=287836&page=1

Hello John I am trying to model a fuselage section, basically simple assumed as a one support ring and a cylindrical shell skin under external pressure. (like a submarine)…. I want to see the stress in the ring, as you could image, the ring is free in the space but supported by the shell skin...

CORUS: Well, the only way for a model to run without constrains is for modal analysis only, so I will agreed that the first 6 modes will give you the 6 rigid movements, but for a Buckling analysis with not constrains I don’t see how to do it (and I will guest is not possible). I am looking to...

I get solution with case A and Case B, but the 360 degree case, How do I do?.. I am fixing translation and rotation for X, Y, Z in just one point, I get the same stress in all 3 cases, but only deflexion in case A and B are the same, for case C not,,, so when I do a buckling analysis I get...

How to constrain a closed ring beam element for 90, 180 degree symmetry cases under external pressure. I need help to define the following simple constrain beam case I got a “circular closed ring” with a square profile 25x25 mm and an mean radius of 518 mm, material steel, the ring is has a...

How to determine if vortex shedding will occur?. This question is more from the theory point of view rather form a CFD simulation point of view. With given object dimensions and speed moving inside a fluid. How do I decide if vortex shedding will occur knowing a strouhal number?. Does it mean...

Hello, Pio3 and Petiesmo. I got two different points regarding with the FEA analysis that Pio3 is doing. Regarding with the fea analysis in plastic like material, please have a look at the thread “ Pro/mechanica and plastic like materials”, so we don’t mix opinion in this thread. Now...

Pro/mechanica and plastic like materials. I have done some FEA analysis in metal parts using promechanica lineal analysis with WF3, with WF4 the hyperplasic model were introduced (so elastomers material like rubber) can be analysed, and now in WF5 elastoplastc material were introduced, both...

I don't have WF5 installed yet, but what do you mean with LDA...(is single pass adp ??? ) or is it a new convergence mode? ( so SPA, MPa and LDA) ?

My panel will be all the time in the elastic region, so a lineal analysis is enough for me (just to make every thing more simple), I am not going to pass my material yield point. The stress on the hole edges and the stress on the edges boundary conditions are the ones I am looking for. thanks...

Hello, rb1957 If you are referring to chapter 4 (Peterson’s 2th edition), all cases for holes and holes arrays are for in-plane forces (meaning that the forces for a x, y coordinate system are apply in that plane only), and because the case I am talking about is an of out-plane (pressure force...

That is my point, if you got a 1 m2 panel with edges BC let said "simple supported" how I can I model a "small section" or even a unitary cell?... how this unitary cell will take into account the BC on the far away edges from the 1 m2 panel?. I have a look at Peterson stress concentration...

Thanks. I am chemical engineer, and I am beginning to do some FEA. basically: image a perforated sheet metal with a 6.35 mm hole with a triangular pich, with give you 40.3% open area. I suppose that this is a classic symmetry boundary condition problem. I want to evaluate the perforated sheet...