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Sebastianmaklary
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Hi I'd like to share some settings I've found to control the timestep size in order to limit runtimes. For context, I'm primarily using shell elements currently. The first step is to mesh and run the simulation and as soon as it has written one "…
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@JohnM The numbering is the order that they appear in the tree, so to make sure that that doesn't change as you're adding more named selections, it is a good idea to add the number 1 to the start of the name of the named selection and 2 to the next …
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Applying the constant-volume assumption (nu=0,5) is how the area is obtained for calculating the true stress from the engineering stress, when tensile test data is treated, so it makes sense that that assumption is also applied to the plastic strain…
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The approach of applying 99,9% damage and only deleting elements if the strain is above 400% was successful. As far as I can tell from inspecting the element time steps, it didn't delete any elements but the highly strained elements have been damage…
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Element deletion does bring more trouble... This simulation was expected to run for about 8-9 hours but after 41 hours, it still had only simulated a quarter of the wanted displacement. The deleted elements had completely exploded but the issue seem…
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Oh.. I hadn't noticed that the deformation scale factor was not 1. I had initially set the movement as scaled by the time (as I usually do when doing static nonlinear analysis with CCX) but then later turned down the simulation time to a small num…
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EDIT: It does work. The attached file is removed and the working one is attached further down. Original text: I've tried to mess a bit around with type 11 contact to test it but unfortunately, it doesn't work to use the edge selection tool in Mecwa…
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Here is an implementation of Law 27, which is the Johnson-Cook elastic-plastic model and with a brittle damage model, which linearly decreases the stress and also includes element deletion. It could probably be tuned so the curve would be even more …
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Aweswome! Thanks! I'll use this information to make my model better. I'm also working on tuning a material model as I have found that the predefined aluminum model AA6082-T6 deviates a lot from our tensile test data. By entering a custom model, I …
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How do I see which contact types Mecway applies? I get edge-edge penetration of faces that are assigned to contact itself, which in the Altair PDF is stated as being a drawback of type 7 but that type 11 is capable of this, so now I need to find ou…
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Duplicate comment. Deleted
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Edit: This question was about how to get Openradioss to run on more threads and now I finally noticed that there's a thing in Options in Mecway to do that. Great! Original text How do we get Openradioss to use more of the computers processing …
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@disla Thank you for that input. It does make sense that the structure will be stiffer if some deformation modes are suppressed by the imposed symmetry, so this morning, I tested it by running the same geometry as a half model and a full model. Th…
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I'm also experiencing that one has to be very careful in applying bonded contacts. Some bonded contacts have been unable to be applied as a tie connection and some elastic contacts have reduced the timestep size by two orders of magnitude. An impor…
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It's starting to look promising! I think I have the model set up as it collapses sort of as expected and I can read out the force from the impactor. I'm still a bit confused as to why it reports the warning "incompatible kinematic conditions in mo…
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Adding /ANIM/SHELL/VONM worked to add the von mises stress as an output. I'm encountering some errors that I don't understand though. I'm trying to crush a box and want to get it to do simple stuff before I make the model more complicated by addin…
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Hi Victor The download link does not yet show version 29 Edit: Now it does.
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Hi I'm about to start a project of simulating a crash of a sheet metal structure using OpenRadioss after having wasted a week and a half with not succeeding in doing it with Calculix. I intend to use shell elements but is it correctly seen that Open…
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@Tao, I've had that issue too, since september 2022 and have kept @Victor informed of whatever things I've noticed. I am also using an Nvidia graphics card (Nvidia Quadro RTX 4000). It seems that the issue is with Direct3D as trying to print while t…
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I used ANSYS as a student from 2015 to 2020 and I must say that I was very happy with many things but it can probably mostly be summed up to that it was fast. Being able to read native CAD formats, meshing sheet metal parts as SOLSH190 elements (con…
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I've done a bunch of analysis of gears where I've used the method that Victor proposes with a time-based rotation constraint on a node. Works fine.
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@sofien_73 Tying all others to one or tying them to each other in series could be a common method. When, in CAD software, I apply constraints such as equal size, parallelism or similarly to multiple selected entities, the software will apply the con…
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@Victor When I occationally do Topology optimization using the BESO Python code, it changes the loads as applied in Mecway to being individual nodal loads so when the resulting file is loaded back into Mecway for visualization, it will have those ma…
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Awesome! I'm especially happy with the inclusion of node-surface connections being added to the internal solver so the rigid spider elements can be retired from this use.
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@German That's really cool! (Semi-) Automatic mesh refinement is a great feature. Will you upload the improved script as well?
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Ooooh, that teaser for Mecway 23 is very interesting! Looking forward to it!
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Cool! Congratulations on the new release.
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Oh this is great! I've never really used the inbuilt solver in part because it seemed so incredibly much slower than CCX (and because I often need nonlinearity) but that may be caused by me often using bonded contacts as most analysis consist of mu…
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I do recall learning about the crack element which creates a singularity due to the interpolation function used within it when the nodes are mapped "incorrectly" compared to the isoparametric parent element, so that it can model a sharp crack withou…
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(Sorry for reviving an old topic) I have done very simple fracture mechanical analysis by modelling a crack in CAD at different crack sizes and then running multiple analyses to be able to plot the potential energy versus crack size and thereof cal…
