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Sebastianmaklary
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No worries. The simulation seemed to run fine but I was just confused about why it kept warning that there were initial penetration in the contact assignment.
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This looks so cool but I'm not sure I understand how you do it. Can you upload a .liml file that I can inspect?
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Welcome Jachym I've had a similar experience when starting to use Mecway and continue to be grateful. I used ANSYS as a student but when I graduated and came to a small company, I was met with that we couldn't afford it and I was stuck doing FEA wit…
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We can't see the geometry in the file because we don't have the STEP files. The geometry isn't included in the .liml file until you've meshed it, so please do so.
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I timed the time to open. The old 20 Gb file was 6 min 30 sec to open while the new 7,8 Gb file was 1 min 45 sec.
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You need a model for hyperelastic behavior. I did a model some time ago of polyurethane bushings used in vehicle suspension. The material model was a Mooney Rivlin model and the solver used was CCX.
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The file that was 20 Gb in version 30 is now 7,8 Gb after being rerun in version 31. So it is true that the single precision results takes up about half as much space as the double precision results and that this is on top of the 20-25% reduction ac…
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A 20 Gb file reduced 25% in size to 15 Gb by opening and saving. I will rerun it and report back what the resulting file size is.
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I'm glad to hear that. I don't think I will rerun the files just to save some space but it is good to know that the space savings are higher from rerunning the analysis. Single precision is half the size of double precision, right? If it halves the…
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OOooh, Great! I see that you did multiple things to reduce the file size and I am very grateful for that as the file sizes for the OpenRadioss crashbox simulations I did before christmas was huge and it gave me issues when opening the files. The f…
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Victor, could you clarify what this would change for us who use Mecway? If the CCX and OpenRadioss solvers have each their own strain measure, then this doesn't change what they use, does it? If it doesn't change what those solvers use as a strain…
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I must admit that I am not entirely sure what the benefits are of green-lagrange strain. I'm a fan of Hencky strain (logarithmic strain) because the definition being that it is the integral of infinitesimal strains seems to me as being the "correct"…
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You can also use constraint equations for tying nodes together but that is a very manual process.
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Wohoo! I especially like the self-contact thing because then I can more easily suppress it for debugging than when it is in the custom model definition.
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I just tested this with a simple but asymmetric box shape, which has 6 faces. The .liml file has triangle surfaceid from 2 to 7 and I can confirm that triangleid 2 is the face number 1 in netgen mesher, so the .liml file is off by 1 compared to Netg…
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Hi Heather 1) The only way I have found to find the particular surface is to download netgen and open the part and in the geometry tab select "edit face mesh size" and then click up until the face number is selected as it is then highlighted. This i…
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Oh right. I had completely forgotten about that one.
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I found out how to make the general contact type 24 detect edge contact by adding the line "0 1 " (29 spaces. I don't know why the forum truncates it to one space) on line 4 in the contact definition in custom model defin…
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I think you forgot to attach the file. Not that I have yet tried used composite shells in Radioss, so I don't know if I can locate the error, but it will be easier to help if the file is attached.
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@disla I is not a welded piece but aluminum plates which are bent, bonded and riveted. I guess that the individual pieces could theoretically go through a heat treatment to anneal and reapply the T6 artificial aging after bending but it is not somet…
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The results of using extended single precision is almost identical to the results running double precision but the speed increase was not incredible at only 3-6% reduction in computation times. This might be because the majority of the computing ti…
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Wow, that was really easy! The executables for single precision is in the downloaded OpenRadioss folder with that name, so the renaming is just in the options tab in Mecway to change which executable it points to.
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@Victor , Is it possible to change how Mecway runs the OpenRadioss executables? I want to test running it with single precision to reduce the runtime for the first part of the simulation when I'm going for a quick iteration through design modificati…
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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…
