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Sebastianmaklary
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Yes, that is very simple to do, if I understand your inquiry correctly.
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Hi Disla No, I did not know about that, but I will definitely look into it as 1E-35 is approximately zero for all intents and purposes, so it would definitely help me better aproximate the contacts of gear faces. I'll try that out soon and see what…
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I usually go with this procedure: Enter some value that seems reasonable and check the penetration depth after running it and then reevaluate if the stiffness should be increased. A lower stiffness is usually better for converging and I'm usually do…
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You're welcome
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If "Quasi static" is deactivated, it will apply loads as a scaling from 0% to 100%. When quasi-static is activated, it will apply loads as they are dependent on the time t, so if your load is not defined as a function of t, it will then try to apply…
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I always love when there's a new Mecway update. Memory use improvements are always welcome and meshing improvements too. As for the bug fix of errors with laminates with more than 40 layers.... I do not envy the worker who has to manufacture a lam…
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As far as I've understood, it just means that the meshing algorithm was trying with a too big element size for the edge length. h refers to the element size as "h-refinement" is the name used for improving analysis accuracy by increasing mesh densit…
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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…
