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I’m looking for a general solution for this problem based on formula. Meantime, I built the equivalent model removing the rigid body part to allow direct measure of deflection. This is the result I’m using as reference. I’m sharing it in case someon…
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You could give it a try to this. It's free. Registration required. It's in French. https://www.cticm.com/logiciel/propsection/ I haven't test this other but was recomended in the calculix forum some time ago. https://sectionproperties.readthedocs…
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Mecway 24 has a new feature which does this I completely miss that. Now I see you have managed to build a local coordinate system aligned along the symmetry plane and following the shell face. Impressive. . I finally managed to solve 1/4 hemi…
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Sorry, the picture.
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What a nice comparison Sergio.!! Reading through the Abaqus documentation I have seen that it provides guidance on how to fit your material parameters to experimental data. https://classes.engineering.wustl.edu/2009/spring/mase5513/abaqus/docs/v6.6…
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Hi Cwarpe, Not sure if this could help you but there would be a way to keep only one of the components of a Pressure by imposing an opposite traction to cancel the undesired component. Traction needs to be scaled. That's where the problem can be di…
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.Nonlinear buckling of long wire (B32R) with initial imperfection under pure torsion using Knot.
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I have found the way to apply the moment directly to the shell. Not 100% sure if this can be generalized but it works in this case leading to the same result as imposing the rotation. Example based on Figure 3a. Cantilever to end bending moment S8R…
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It seems it solve the 360/180 problem. I have pushed the number of revolutions of the shell strip example up to ten and the approach is robust. It fails after 8 complete turns. That’s normal considering there is a lot of deformation involved. I hav…
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Popular Benchmark Problems for Geometric Nonlinear Analysis of Shells K.Y.Sze1*, X.H.Liu1#, S.H.Lo2 Results: https://we.tl/t-4JbvRCH53m
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Oh!. ¿Do you have available any case where extrusion degenerate the elements?
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EDITED :Erased. I can see you have also enforce radial displacement.
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This is the test file used to extract the curve and some background from the original authors. F . Hamon and Jean - Michel Proix and Thomas Helfer.
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And if you order with Pastix neither. ¿?¿?.
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Yep. thats your problem. I have just try and it fails with the compiled version. Rafal portable links with the official version only. You must use the official ccx 2.21 downloaded from the webpage of the autor. http://www.dhondt.de/calculix_2.…
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I think that dll is related with the Pardiso solver. It should work also with the default PAstix solver. Suppress my entry on the ccx three to run with the default Pastix solver. It should work too.
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I would say you have something not properly linked to the .dll? This is how my working directory looks like. I'm using the dynamic version of ccx 2.21 from official webpage and very last MFRONT portable sent by Rafal v2.8. By sure the working dire…
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Is there someone else that the convergence fails at that time step.? Is it for all s1 s2=s3 combinations or just some of them. Just for reference: Could you try this two time steps. EDITED: Loading conditions are not easy to constrain in such a…
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It must fail but not at the time step its shown on your monitor.(9.766E-6s ?¿?) Have you change material parameters or loading conditions.?
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If before defining the laminate you enter the overall thickness in the geometry window, the less than 10micron error disappear.
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I have finished the testing and the agreement with the expected result is very good. DRUCKER PRAGER CAP material behavior needs custom cards as shown above and the portable MFRONT drivers recently published by Rafal.brzegowy in the Calculix forum. …
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Seems like the forum do not accept the symbols Bigger than and lower than and removes it's content. What I can't relate is constant MFRONT Tau with Abaqus beta, K , sigmac. NOTE: First post can't be edited. Damn it. Units are obviously wrong. C…
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Ok, I will try. Thank you.
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Initial position: The boogie has velocity 1000mm/s and offset t0=.75 seconds. It is advanced 1000*0.75=750mm from the origin. The center of the load is in between two elements and Mecway has split the load. For the load to arrive on the center of th…
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@Victor, I was setting this up and abondon when realized the amount of equation required. Colinearity should be imposed by pairs of nodes on each equation. Writing all nodes in one *equation card isn't enough.
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Hi John, Have you tried two springs instead of one and a solid or beam section in between? The pretension would be applied to the that mid element. This is the idea.
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The different Strain measures helps you to understand the result and convert them as needed. By now you have probably found that the Strains given by ccx when NLGEOM is ON are the Lagrange Strains. If you want to use them to plot a Stress Strain Cu…
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Hi Fatmac, I have also noticed that you should also take a look at your graphs. They don't seem consistent with your results. They reflect the importance of distinguishing correctly not only the stresses but the Strain you are talking about. Engi…
