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Hi gscheffer, May I ask you which load would cause that displacement pattern? Are those strict displacement imposed for some theoretical validation?
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This is the expected result for Euler with my parameters
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Hi, @LHartley Main drawback with truss elements is that to work properly and do not become a mechanism they should only have two nodes. They may work fine for static, but two nodes are insufficient to give good result in buckling analysis. See fil…
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Gravity load shouldn't be inside the Buckle Step. I apply it in a previous step and then the Buckle is computed as a perturbation. That's because the self-weight doesn't scale, is always fixed no matter the external loads. I recall a buckling analy…
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Problem depends on how the contact is enforced in real world. BC must reflect that process. For example. If glass assembles on top of the mold in horizontal position, self-weight seems enough to make glass and mold to accommodate each other, and it …
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Nonlinear Dynamics with large rotations. Axis should keep aligned to the global axis after each rotation and it does. Angular momentum is nicely preserved. After some cycles numerical error acumulates and it starts to deviate but more than enough. …
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My bigest problem with my first small tests, is that the color coding of the bar stresses does not show up well on the screen. I experienced that too. Victor help me at this point. "On nodes shared by beams and solids, CCX averages the beam int…
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Glad to hear you have recovered. Of course, a little mecway can be a good rehab exercise to get you back Apart from increasing the number of increments as pointed by Victor, *Controls also allows some changes on the iteration parameters. I also mad…
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Thanks Victor . I will give it a try.
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Thanks JohnM, I have moved to Dynamic. I think I have dirty spark plugs but I‘m progressing.
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I have applied different combinations of the recommendations and hints contained on the attached files, but I found a big issue solving with NLGEOM Quasiestatic. Shaft bends with centerline offset properly but the system lacks from rotational inert…
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-One boundary conditions is repeated. -You can not apply BC on the Surface of the rigid body -Your Young modulus is very small. Don't you mean 100 GPa ?¿. -If you are willing to see some bending on your shaft you can't make it Rigid. -You probably w…
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You can also try to add the dummy load as pressure. Like "Squeeze" the truss along its longitudinal surface. Small enough not to alter the overall capacity. (10Pa) @Victor. Right. Large Strains require other strain framework to get realistic result…
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100% seems a lot for an Elastic material. If you don't mind triggering nonlinear analysis you could try with any hyperelastic material for the truss.
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Start with a much-reduced model to find the right contact parameters , mesh density and material model to get a better understanding of the problem. Other problems may emerge when going to the full model but big ones would be cleaned. The problem i…
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It's a bit of a pity that you have to keep one unused to put the dummy constraint on That's the one the user wants to release.
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Example attached. Mecway warning about “Rotational DOF do not apply to beam or shell elements with the ccx solver” is sorted out. Hopefully Victor finds a way to implement this.
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Thanks Victor
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https://we.tl/t-JKQM1dZVqb
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Not sure if it was @JohnM or Sergio who posted many years ago the idea of self-contact. It works very well in this case. One needs one contact for the initial Strip , Cilinder, and a second contact with itself once the first turn has roll. Don’t o…
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I have looked the textbook theoretical solution in more detail and noticed that the Maximum tangential stress was evaluated at the mean radius not the external face. I think it's worth to update the liml file taking that small difference into consid…
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Manual warns about the inacuracy of distributing across curved surfaces. It can be seen just by redefining the C_SURf_D faces to the ones shown on the picture.
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File in a second post so if there is some comment I can update.
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Regarding what options to consider for ADJUST I would say all the options mentioned by polymathic including suppressing the ADJUST parameter as it makes a big difference. (See attached file).
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Hello, I have edit and rewrite my previous summary. Hopefully, it is more clear and not so model specific and more accurate. It only refers to the creation of the contact itself and how ADJUST affects the result at the end of the first extra step. …
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If the attached file is representative of your model set up, I have a possible explanation of why the dummy force helps to progress. Even if the contact is achieved with ADJUST as mine (Number of contact spring elements=672) the convergence can fail…
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Could you try if adding ADJUST=0.1 solves with no more changes? That can be done with modify Keyword without the need to rewrite the contact. NOTE: That will affect all the contacts if you have more than one. I have two parallel contact stacks in…
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If I’m reading properly the manual, this would be the sequence. 1-Adjust. 2-Clearance/penetration evaluation. 3-Springs generation. Points 2) and 3) may loop as the model evolves. ADJUST response to Initial Geometric Penetration (TIED) If ADJ…
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Hi, Could the adjust parameter be responsible? I’m missing it specially with unilateral. I have been trying different configurations . File attached as example. Apart from finding some combinations of master and slave more suitable than others, if …
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** Generated by Mecway 24 *NODE 1,-0.1010898679595,-0.5279358078186,0 2,-0.1011483875011,-0.5310025307924,0 3,0,0,0 4,-0.1012028779094,-0.5340692537661,0 5,-0.04410311149671,-0.1385981326659,0 6,-0.100960740244,-0.5218023618711,0 7,-0.101299…
