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Sebastianmaklary
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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…
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@Sergio, introducing mesh imperfections can indeed be a way to obtain a more physically accurate result because reality isn't ever as perfectly straight as an FEM model can be. Years ago, i read an article on modeling failure of aluminum honeycomb c…
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@disla, My reasoning for seeing if I could force necking to occur in the center was that my first thought was that the accumulation of small numerical errors would be the only reason for seeing any necking at all in a uniformly loaded specimen. The …
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The oddity got worse. Expanding the kink in the center to be a wider band that is 5,01% smaller cross-sectional area (as the picture below) still didn't result in necking in the center. Removing elements in the center did force the necking to occu…
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I've looked a bit more into it and I'm becoming increasingly sceptical that the necking is the simple accumulation of numerical error in what is ideally a uniformly stressed specimen. With cubes with a sidelength of 8 elements and a timestep of 0,00…
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With the refined mesh and the small timestep, both behave similarly with necking initiating from around 1mm displacement (1st principal strain around 1,3) but they end up with slightly dissimilar levels of plastic strain in the necking. I don't trus…
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I noticed that the timestep was so great that the first timestep was beyond the linearly elastic region, which I thought might be the issue. Reducing the initial timestep didn't change much but reducing the maximum timestep as well to 0,0005 seconds…
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Awesome Congratulations on the new release. I'm especially excited for the compression only support being usable CCX as it makes sense to be used for pinned boundary connections when the stresses near the pinned hole aren't completely irrelevant…
