Stuck? 
support@mecway.com
support@mecway.com
Mecway
FEA
prop_design
About
- Username
- prop_design
- Joined
- Visits
- 14,263
- Last Active
- Roles
- Member
Comments
-
well a perfect cube is the ideal fea element shape. if you meshed the surface with 4" quads then the shell model would be 4" thick. i'm not sure of your geometry. but seems like something you could do in mecway directly. the other option would be to…
-
interesting. i have been wondering if scotch was better than metis. so scotch is slightly faster it seems. the difference from pardiso was 1.3x. much more reasonable than what the ccx website had said.
-
there is this; https://www.salome-platform.org/ i've never used it and don't really know anything about it. however, it is open source. the website says it can be used to make cad models for simulation. perhaps others know if it is a viable option …
-
I don't know of any good open source CAD software. However, for low cost CAD software, I really like MoI3D. It's not too expensive. Like Sergio said, Alibre is really good if you need parametric CAD. MoI is strictly a NURBS modeler. So if you need t…
-
hi hooshsim, i have been trying to find the formulas i was referring to. unfortunately, the stress stiffening effect is hard to find good info on. the ansys manual has a good explanation of the spin softening effect. i updated your example to incl…
-
hi, i'm not 100% sure, but I don't think so. i do the stress first then save the file with a different name and do the modal analysis with stress stiffening. the stress i have been doing is nonlinear. the modal analysis uses a linear stress. there…
-
sure, here you go i updated the download again; see post below
-
yw. i added one new example to the download. when making it, it reminded me of something. if you have custom scripts/cards etc for CCX you will most likely need to delete those too. the modal analysis doesn't like/need them. all of the examples star…
-
when you add the 'New Stress Stiffening' it runs the static analysis then the modal analysis. so it does it for you. what i usually do is just save the static analysis as another file with a different name. then switch the solve to modal analysis 2d…
-
ok, here are the examples i have. due to the large size of the download, i had to clear the solutions from the examples. if you want to see the results, you will have to re-solve the files. update; added one additional example https://www.dropbox.…
-
yes it's possible. just setup a regular modal analysis and add the 'new stress stiffening' load. obviously, fix the model and apply whatever loads you want. i'm looking for some old models to post. be a few minutes.
-
hi vmh, mostly it just took too much time. there were maybe 20hours of videos or so. all done in one take. i have probably remade them 3 times already. most people were only viewing maybe 6 mins or less of a 40min video. so it just doesn't make sen…
-
i can't edit my previous post, however, I deleted the YouTube channel and video today. so the link provided is no longer valid.
-
I deleted the YouTube channel today. It's a lot of work to make the videos and the utilization of them didn't justify the time needed to create them. They become obsolete with time and require re-creating them over and over as well. So just not wort…
-
lol at sergio and JohnM. same thing with me as well wrt Spooles. yes, i'm curious about PaStix as well too. i hope it will become easier to have a windows version of it. right now it looks to be a bit of a pain to get it going. Guido is saying he sa…
-
thanks victor, there was a useful post there about version 2.17. guido is saying the PaStiX solver is up to 4x faster than the Intel MKL Pardiso solver. also, if you have nVidia graphics card with CUDA support that can go up to 8x faster. not a lot…
-
hi sergio, i haven't used any ccx feature that isn't built into mecway. i just listed some of the interesting things, to me, from the release notes. i have tried various cfd programs that are out there and wasn't impressed with any of them. i doubt…
-
in the notes it says he implemented mortar contact. that might be useful. not really sure. it looks like it helps with contact and dissimilar meshes.
-
i added more chamfers where needed. decreased the min chamfer size to 0.2mm. 0.4mm was too big for the new locations. the min mesh size is still 0.4mm. pretty much the same results. however, the model is huge now. it took 25mins 57secs to solve. so …
-
i think i found the problem. i re-checked the source file i had for dimensions and the fillet radius is not clear. one dimensions indicates .85mm, which the fea showed was way too small. another callout says 3mm, which is geometrically too big. i us…
-
I experimented more with contact stiffness. 1.2e4 GPa/m seems a bit soft. 1e6 GPa/m and 2e6 GPa/m work equally well. However, you start to get some of the splotchyness back. So you can set that value as you see fit. Not too much diff on results. 1e6…
-
So this is interesting, I guess. I made a different model of just the bolt. The the bolt without the head but still had the chamfers. This changes how the fixed bc operates. Then just the shank. So pure tension of a 16mm rod. The only one that match…
-
Below is the latest version of the files. I made some updates to the standalone bolt file and the Mathcad file. The difference from bolt calculators is around 3-8 depending on single part or assembly, as well as how the assembly is setup. Updates b…
-
here is the latest version. once i changed the stiffness for all contact inputs to '1.2e4 GPa/m' I also changed the plate materials. The goal was to bolt an aluminum plate to a stainless steel plate. I was able to do that. One nice thing with the Me…
-
so in the original model i used '1.2e4 GPa/m' for all contact stiffness inputs. That seems to work very nice with the updated model too. I'll post an update soon. But no more splotchy results. Nice stress and displacement contours through the parts …
-
Thanks John, I'll take a look. I am definitely being limited by mesh density. I tried numerous models before I arrived at the one with chamfers. That's about the best my computer can deal with. I experimented with contact stiffness last night and …
-
I was looking at this file recently and noticed that it is sized twice as big as it should be. The radius inputs where supposed to be diameter inputs. The tightening torque was off by a factor of 10. I had the decimal place moved over by accident. …
-
Hi, I made this example awhile ago to answer a similar question. It shows how to model a bolt in the simplest way possible, using a solid model. I don't have any insight with trying to do something similar with beams. http://mecway.com/forum/discu…
-
i believe that is a new behavior for v13. it lets you apply loads to the outside surfaces, since ccx does the solid expansion. if you want to apply a load to the midplane, like the old versions, you can do an element selection i believe. so it's a b…
-
you can get the intel mkl from here; https://software.intel.com/content/www/us/en/develop/tools/math-kernel-library.html you do have to sign up to get it. i don't know what 'EX studio' is anthony
