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This could be a good validation file as reference. Full model has 0% discrepancy with the closed form solution. Analytical solutions for finite cylinders compressed between platens (3. Homogeneous stress and strain without end friction) https://ww…
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OOh. That's weird. ¿Are you using Mecway 18? At "stress in element coordinates" neither?
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Hi, First to say is that I would define the same orientation card for all your model to be sure you extract the same component for all the elements. The last three components of the “stress in element coordinates” and “force per length” refers to …
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By the way. This is the 1/4 model. After three refinements I have end up at an equivalent plastic strain of 1.978 after 3min computation. ¿I guess if there is analytical solution for this problem and Mr. Kraska knew that?. PEEQ seems to tend to 2.
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Hi, I understand your concern. This is how I would proceed. 1-The fact that too solutions are the same (full/slice, slice/axisymmetric) doesn’t mean the solution is right unless one is validated. You need an analytical solution to compare, prefer…
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I have seen this is also done by the main Steel's connection design software in the market. "The shell is divided into five integration layers through thickness of the plate at each integration point and plastic behavior is analyzed in each point. …
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The hexagonal Bolt-model should be in fact be called JohnM-Bolt-model. Check the link below where it was first described. It's worth to spend a couple of hours and build a library. Another thing I consider interesting to look at is the meshing. Look…
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From the manual: Eight-node axisymmetric element (CAX8 and CAX8R) "The axisymmetric structure is expanded by rotation about the second coordinate axis, half clockwise and half counterclockwise." "the expansion creates only one layer of elements. C…
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I think that should be (2100Mpa+265Mpa)*1.000.000=2.365.000.000Pa *PLASTIC,HARDENING=ISOTROPIC 265000000,0 2.365.000.000,1 I see what happens. Seems like you take the second point of the line at a strain of 1.000 . Strain rarely should go beyo…
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Manual: "Sometimes, it is useful to specify that the radiation is closed. This is done by specifying a value of the environment temperature which is negative if expressed on the absolute scale (Kelvin). Then, the view factors are scaled to one exact…
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I have downloaded your file and considering only external surface to compute the view factors shouldn’t be a bad hypothesis. The winding is very dense.
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Look at the conclusions at the end of this post: https://mecway.com/forum/discussion/comment/6023/#Comment_6023 If you can live with this 15% I would try: -Uniform temperature on the spiral area. (2000K-2500K) -Consider the spiral as very tight …
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Hi Manuel, I would be very interested in validating or at least end up as close as possible to the Bearing capacity provided by EUROCODE 3. I’m posting the EC3 result for this configuration. I have changed the bolts to 8.8 as I don’t have 6.8. I’m …
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Hi Manuel, Feliz año. I would say there is some initial mesh penetration or too much clearance in the contact areas. If "Adjust" is active the nodes are projected strain free from slave to master. Those crazy nodes flying could be those adjusted …
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Hi Victor, I don’t have programing experience to evaluate how much work could be involved in one of these features. I was looking at one .inp I downloaded at YouTube below the referenced video and it seemed to me it just added the *plastic card. I’…
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Allow for plasticity on ccx when the laminated shells are isotropic. It now gives a warning. *PLASTIC + *SHELL SECTION,COMPOSITE This can be useful to add integration points to isotropic shell elements and solve Plastic behavior accurately.
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Based on the proposed example, this picture shows the GNA solution with the layered approach (6x2mm ) and how the first three modes are triggered. Like in a spectrographic analysis , displacements show three clear snaps at (0.31s , 0.39s and 0.64s).…
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Hi, I'm having some difficulties too. Not with linear buckling like in the example but with the nonlinear approach + S8/S8R. (S4 works but plasticity is not properly captured). I have seen one person solving the problem with a layered approach comb…
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If you revolve only one element there should be no difference. If I’m not wrong Victor comment that this is what ccx is internally doing when modeling Axysimmetric shells. In this sense, this method could improve the “pure” axisymmetric approach as …
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Hi again Andrea, You could get full hex mesh combining the mesh tool Create plate mesh + later Custom refinement of the contact surface. This way you can refine the area of interest preserving the hex mesh. Final extrude if needed.
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Yes. Pyramids are written as C3D8 for ccx .
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Hi JohnM, One variable that often goes unnoticed and I usually forget to set is "Generate solution at XXX time steps". If you are not particularly interested in the nonlinear process evolution but the final result, you can save a lot of disk writin…
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I forgot to mention Output2D is required if you are modeling with shells as they are expanded. With solids is not needed.
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You must first select the mode in the solution, then go back to the modeler and use Transfer displacements from solution in the Mesh tools menu. The active mode will be transfered You will be asked to provide a scale factor in the process. It is im…
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I have just realized there would be a much easier way to do it. Fix one end of the wire to the pipe and the other fixed in the space. Then rotate the pipe instead or pulling the wire. In any case , work first with the simple model . The set up will…
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Start from simple. 1 turn model to understand what is going on here and the physics behind the problem. Maybe you don’t need so many turns. Pay attention to the key role of friction in this problem. Try to converge 1 turn first.
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Hi and Happy New year everybody, How is the animated solution constructed when performing frequency or buckling analysis? Unlike static, this type of analysis does not seem to interpolate between the model at rest and the solution. I ask this be…
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@LHartley , You are absolutely right. It makes no sense to skimp one or two millimeters of thickness on such a small part. You never know where an unforeseen load may come from. I've seen workers on site pulling with a tractel tied to the column t…
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I have been discussing about this recently. According to my new spreadsheet could be even less. SHS 65x4 S450. Pcr (Euler)=635KN Ncr ( EC3 )=635 KN Nb,Rd=261 KN (Cold Formed- Curve c ) Nb,Rd=347 KN (Hot Formed- Curve a0) In any case Nc,Ed=3…
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Hi JRP, 1-I don't think you need to move the unzipped files to the Mecway folder. Just keep them all together in the same folder and point to the .exe file from the MECWAY menu: Option/CalculiX. 2-Add the unzipped folder with all the ccx file and …
