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Is this simplification still reasonable for an explicit nonlinear dynamic response analysis or does it suppress something important? @Sebastianmaklary Non-linear Buckling involve out of plane displacements. If you impose symmetry BC you are re…
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Congratulation Victor for the new Version. !!!
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Membranes can’t sustain bending . In a bending test you would expect a V shape compared to the U delivered by a regular shell. To see the expansion add NODE FILE OUTPUT 3D option
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Thank you Victor.
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Hi, Following the above discussion, If Perimeter value is not involved in the stiffness matrix, would I be wrong if I assume that value as 1 [m2/m] by default so I can indistinctly convert in-between linear load (KN/m) and Traction load (KN/m2)?.…
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Makes sense. Doubts cleared up. Thanks Victor.
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Example One arrow size should be 10 times higher than the other.
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The file separated in case I need to update. Feel free to comment in case someone finds any improvement. This same problem can be found solved on YouTube with Abaqus but my approach has some small differences (more symmetric mode shape).
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By the way. I’m not aeronautical engineer. The proposed example is not intended to show how to constrain the base of a wing. It is just to point or make more evident why the error message emerge. Constraining all translational DOFs goes beyond what…
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Hello, I think I can help with this. To solve the problem one needs to keep in mind that when applying a Symmetry BC in ccx , Victor is first transforming the coordinate system to align it to the shell lip. Then 1 Translational DOF and 1 ROT In the…
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@Sergio Me I was also finding some discrepancy too. I have look at the source of that problem and solve the equation again. Arpaci, V. S. (1966). Conduction Heat Transfer. Addison-Wesley Book Series. (p. 130). Free acces: https://archive.org/det…
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HI Victor, Here another working example using the same criteria but diferent transform. I would say that as far as the new transform is coincident with the local coordinate system and loads are expresed acording to it is should work. Orientation is…
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Regarding the *transform definition I would say that the key point is to select a rectangular coordinate system that perfectly match the beam orientation. Beam orientation can’t be left to default. You can try and it fails. From all the reference…
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The file in a separated post in case I need to update.
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Hi Wjasiew ¿Have you consider using a Laminate material model ? Regards
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Thanks Victor. Seems I copy/paste a Russian word from a webpage.
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Hi Victor I finally found the reason. It is related with the file name itself. There must be something on it "a forbiden character I guess" that prevents from opening the file. Curiously, when using the internal solver, it works fine but ccx solver…
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I have found an old thread talking about this but I'm not using Bconverge and my executable is always the same when using MECWAY. "ccx_MKL"
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I thought about this problem for some days without any idea. First equation is an ODE that could be solved exactly once you get the Temperature evolution profile T(t) from the transient. I’m assuming E and R approximately constant. One side can be …
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Hi, Someone asks me in private about this approach. This is a reduced version below 1000 nodes to show it. Regards
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You still have a mixture of First and Second order elements. Merge nodes after homogenization. Then it will work. Your model looks difficult to me. Your spring is thin and has significant presence of Shear Mode III . . I would try to do some valid…
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There is a mixture of First and Second order elements. There is a line element in between the model too. You can find it with the tool Select elements by ----> and then Line 2 Line 3. Then erase it. What a cool shape.
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Thanks Victor.
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I completed the exercise with very good agreement. I don't do electrical FEA at all so probably my first part of the analysis to obtain the internal heat generation could be improved or speed up. Regarding the thermal analysis I had to do it with t…
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I have work Joule Effect on Mecway based on an example problem very similar to yours (more complete) that has analytical solution to compare. It solves the nude and insulated wire. It could eventually help to validate your Setup and Procedure. Read…
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You need to put all your electrical and thermal material properties right into place first. Clean and with their units. You started the post saying something about h=10 which now seems that has disappeared, You are mixing material properties with r…
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Thermal Conductivity units are W/m/K What about your electrical properties.? How did you end up in this value of "Tmax should be approximately 50C".
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Starting with a small brass rod 1mm dia. x 5mm long, I am applying 0.42A. Ta=ambient 20C , h=10, K=109 Tmax should be approximately 50C ¿Could you detail the Brass material properties units you are using?
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Here an example. Thermal Transient with varing negative mass flow. Result shows an alternating MF. That do not happen when the mass flow is positive. (constant or varing). I think this is a ccx problem because frd is showing the alternating value to…
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Hello Victor, I'm considering including an amplitude for the mass flow. First thing I have done is to request the actual value with *NODE FILE MF and I have found that the one defined as negative (water in the attached file) is showing and alternat…
