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I used ANSYS, a long time ago (and for many years). Before their Workbench product was created, there was DesignSpace. DesignSpace was nice. I wasn't that big of a Workbench fan. However, at first, Workbench was just a renamed DesignSpace. However, …
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thanks victor, that gave me something to google and it makes more sense now
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Hi Victor, What do you mean by "incompatible mode hex8 elements" and later "incompatible type with CCX". The word incompatible is what is new to me here. Since you say that "They are hex8 elements but using the standard formulation from textbooks…
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it's probably a ccx expanded shell model. if so, you have to use the output=2d option to output the midplane. the issue there is the stress won't be correct. so ignore any stress when using output=2d.
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Honestly, I'm not a fan of github and don't want to create an account there just to suggest stuff. It would be better to do it some other way, in my opinion. A way that doesn't require us to create more accounts.
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@protontim Mecway has had the capability to do composite layups for quite some time.
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I'm with @Sergio on Mecway internal nonlinear solver coming back. Especially for shells and beams. The ccx shell expansion does cause issues, in model setup, a lot of times. I did find solids were better than shells though. shells don't capture the …
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@c3d10 thanks. bolts are rather interesting. the fact that they are installed near their failure point had made me wonder why they don't break as soon as an external load is applied. you're explanation makes sense.
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@cwharpe lol, thanks. It sounds crazy, but work as long as you can. Mecway has helped keep my mind active for many years. I don't think engineers can ever really retire. Even when your body stops, your mind keeps going. So many of my coworkers cam…
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oh, i forgot. besides the methods in the old mecway manual, i also used cyclic symmetry to model axisymmetric. i also ran the full model. all of the models yielded the same results. it was for a solid model though. i never tried with shell or beam. …
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that's good to hear about the bug fixes. the way the version on the ccx website works is it has spooles and pastix embedded and if you copy the pardiso dll files into the ccx.exe folder it will also run pardiso. it would be nice if the ccx.exe file…
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Thanks for clarifying Victor. Everything makes sense to me now. I recall being confused as to how axisymmetric worked in Mecway, because there wasn't a menu item for it. So this seems a lot more clear. Or how the user would expect. You are right, th…
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"Symmetry boundary condition." I haven't used Mecway in awhile (I think v19 was the last version I used, due to retirement). However, I still like to read the forum. I'm confused as to the 'new' symmetry boundary condition. I recall doing symmetry …
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@JohnM interesting. I wonder if @Victor could make that the default behavior. Then if you wanted the file to be located in a different folder, use the in program dialogue. One thing that has always frustrated me with changing the step locations is i…
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hi, i had the same question you did. i did a lot of tests and it didn't seem like it hurt results any. i was surprised that the high aspect ratio expanded shells perform well. i use them for laminates as it's the only way i can model those with thi…
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@victor the last time i tested solids, you couldn't change the element orientation. if you did, it just used global axes as it normally would. i haven't tested it in several years though. did something change? update; did a quick test with the curr…
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some other notes that are related. using shells is necessary for composites, because that's the only way you can assign element orientations. they are ignored for solids. the other thing i have found very useful is the ccx shell expansion method out…
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one thing to keep in mind is ccx expands shells into solids. if you really want to use shell elements, then you would have to use the mecway internal solver. unfortunately, that currently doesn't have a nonlinear option. most of the stuff i do uses …
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i accidentally found a really nice view of the results. if you look at the tensile stress, and reduce the max contour plot value in the legend, you get a plot that looks just like text book but with more detail. this is a cut plane view, so there a…
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Below is a link to the latest version of this example. As the OP of this thread found, it serves as a pretty good performance benchmark, also. The mesh size will max out 16gb of physical memory. So if you have less than that, it will most likely cra…
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I updated this example again. Since others started using it as a benchmark, I went ahead and ran it with PARDISO and PASTIX. There is a spreadsheet that has the results for my laptop. The mesh is set to the highest that will solve with 16gb of memor…
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here is a link to the latest versions; https://1drv.ms/u/s!AubMNYNIQyqKgnffPAZOPcudy2Lc?e=CdDdPt i took the old link down to save online storage space. i updated all of the files except for the solve time spreadsheet. one thing that occurred to me…
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that's really weird about your pardiso issues. you should be ok to run them with pastix though. i would turn mixed precision off via the environment variable. in some of my files you would have to change PARDISO to PASTIX in certain places. i'll wor…
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@disla @hooshsim i redid the fan model, to make it smaller, so that i could solve it the way i wanted. once i did that, the results of the full rotor make a lot more sense. so some of the tricks: model one sector in cad, then mesh that sector in …
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@hooshsim. i didn't know that was possible. so you can model your asymmetric model with cyc sym then? sorry if i caused confusion on that. i thought the model had to be symmetric.
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great find @disla. that's something that could really benefit @hooshsim
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oh wait, i think i get what you mean now. yes that's clever, as victor says.
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i don't quite understand your process there. if you rotate one side to the other, isn't it still misaligned? you mention bonding that side i think? you can message me on here if you want, to explain further. the last thing i wanted to try was too b…
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i believe my ccx cards of ok. i double checked them though. it looks like on the a400m model the extra modes are just the nodal diameters. it sorts by frequency for the full rotor. i think the results are the same as for the cyc sym model, once you …
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i ran the fan model by rotating one sector and using bonded contact, as @disla suggested. unfortunately, that didn't have any effect on the unexplained modes, when compared to the cyc sym model. there is one other thing i want to try. however, i'll …
