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Victor
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Sorry about the trouble with CCX. I hope you'll find OpenRadioss much more capable for that sort of thing. It does output shell stress and strain but Mecway currently doesn't have those in the GUI (some will be in version 29). You can include them …
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I see. Set the element orientation of all the elements to something convenient, which depends a bit on the geometry or what orientation you think of as 0-degree. Then define a laminate material and enter layer properties with the bottom layer firs…
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@ericwalsh55 Could you post the .liml file? It's hard to see what's happening with just the OpenRadioss input. Just a guess but the Reference Guide says /INTER/TYPE7 has small time step with small gap and the gap seems to be the default Gap_min whi…
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It's the other way around. The tangential stiffness is in series with the friction, so it would ideally be infinite. That won't solve so you have to tolerate some large finite value. The lower it is, the more of the tangential motion will be dominat…
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Just a follow-up. I wasn't able to reproduce the crash with the same version of Alibre Design. However version below 25 still won't be compatible with Mecway so I'll leave it as is. 25 seems to be the oldest version that works.
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The arrows for each of the two loads are scaled independently. I know this can be misleading but I'm not sure how else to do it. If they were all scaled by the same factor, small loads would become invisible.
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It looks like you picked the exec directory so it's looking for things below that. Use Find OpenRadioss root directory button again but pick the OpenRadioss directory instead of OpenRadioss\exec. That will reset the environment variables as well as …
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I don't think it needs a web connection unless it needs to install the .Net Framework. I'm not sure about which version they need or what Windows 7 SP1 comes with but it's probably OK.
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Are you sure \exec\ appears twice in the path? You may need to pick the directory above that in the Find OpenRadioss root directory button.
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The last 32 bit version was 9.0, here: https://mecway.com/download/oldversions/mecway90_32bit.cab You may first need to install the last 32 bit version with an installer (7.0) for dependencies: https://mecway.com/download/oldversions/mecway70.msi
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Can probably also be fixed by installing VC++ runtime described here: https://mecway.com/forum/discussion/comment/8501/#Comment_8501
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For anyone else coming here, a customer was able to solve this error by installing Microsoft Visual C++ 2015–2022 Redistributable (x64) then rebooting or restarting Mecway.
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I'd be careful putting any rotation constraints on a shell that isn't parallel to the surface, otherwise the CCX bug may overstiffen it. It think it's safer to exclude the intersections from the symmetry constraint and optionally manually add displa…
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Thanks Andrea
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Do you mind if I also ask what field or culture uses these daN units? I've never seen that before.
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Understood. For now, you can use the heaviside() function in a formula like an if statement: if x > 0: y elif x < 0: z would be: heaviside(x) * y + heaviside(-x) * z
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You can use arbitrary large values, such as 1000 * G12. This approximates no transverse shear flexibility like a Kirchhoff thin plate.
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You might need to exclude those edges from the symmetry. You should be able to at least put a displacement BC on them. The rotational BCs are what usually causes the the problem.
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Oh, I see. At the intersections, I'm not sure what CCX does - maybe it'll tolerate any orientation or maybe almost none. I would just leave them whatever arbitrary orientation the symmetry constraint picks because they're discrete points so errors d…
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Oh I see. No, the failure criterion is only for all of them, so I suppose it assumes they're all the same material. Good point.
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It seems easy in simple cases like this. Is yours different, maybe a curved edge shared by multiple shells?
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Thanks Sture. I've added a few of these to Github issues https://github.com/victorkemp/Mecway/issues I'm a bit hesitant on failure criteria, in part, because you should be able to do write them as formulas in the solution. You can already have mor…
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Could you be a bit more specific? Is the issue how to convert the layup schedule to material properties and element orientations, how to input that into Mecway, or more about meshing? Are there any compound curves? That can make it difficult, othe…
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I think CCX is OK with rotational DOF constraints on composites but you have to align them with the shell edge tangents. The Symmetry constraint in Mecway does this. Internal solver composite buckling is probably wrong.
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Yes, a rule of thumb for requiring nonlinear analysis is deflection to thickness ratio greater than 1/2. Consider an extreme case of a catenary. A chain has zero bending stiffness so it can't support any load at all without updating the stiffness t…
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No problem. Version 29 will allow you to set modes and times in a table before solving.
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OK, that makes sense. I tried with slightly misaligned transform and it went wrong. This sounds like a solid solution for moments on the ends of beams but it's going to be more limited for constraints in case you really need the transform to be diff…
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Yes, you'll have to define *MEMBRANE and disable *SHELL like you did. I wasn't sure you'd used custom element type, that's all. It looks like you have membrane working fine. I'm not sure what the bug was or if it's still present.
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There have been bugs with membrane elements in CCX so be careful. That's why it's not enabled in the GUI. You can use CCX -> custom element type to change quad8 to M3D8 so you don't have to rewrite all the element definitions.
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Wow, that might be the silver bullet! Incredible discovery! It looks like you might have tried other orientations of the transform. Did you find it has to be this specific one? von Mises isn't really wrong, it just looks that way because it's unif…
