Stuck? 
support@mecway.com
support@mecway.com
Mecway
FEA
JohnM
About
- Username
- JohnM
- Joined
- Visits
- 2,646
- Last Active
- Roles
- Member
Comments
-
Plot your Z displacement on the top (non-impact) side of the sphere, I think you catch a higher order flexing mode of the sphere
-
I use TetGen for difficult STL. It identified two small areas with self-intersecting shells, which nothing will want to mesh. Once corrected it meshed fine.
-
You know the joke: The patient says, "Doctor, it hurts when I do this." Doctor says "don't do that". I have learned to avoid refining hex models that require making pyramids. I have seen things that make me suspicious of their behavior. I've not…
-
If you need the right answer, put a part in that mimics the feature that is transferring the load. In the example, the collared ring actually comes out of contact and concentrates more load at the extremity. Also be careful with your frictionless s…
-
The figure I shared bears out what you are saying - the cantilever with 4 layers is "almost" good enough.
-
@Sergio gaskets, bushings and o-rings can do okay with hex8 in compression, but for a membrane like a balloon or with mixed bending, we know that they are too stiff. Some of the examples are "really cool", but I'm sure I will never be able to share
-
@disla, @sergio, @victor - thanks for all of the input, here's update for what it's worth. We kept write frequency low, element count as low as possible, lowest reasonable contact stiffnesses, elastic support to keep things from "jittering". 14 hou…
-
@sergio I know this trick, but also be careful, the hex8 tend to be stiff, particularly in bending. I find hex8 good for o-rings but less useful for a bellows. There is a SimCommons video on this, but I just repeated something similar to remind me…
-
@victor, good suggestions, we do these! The model has rubber, I'll check the contact penetration on the last run, maybe we can back off some more.
-
@disla, good suggestion, we do this. @sergio, good suggestions, we do these. Thanks for at least reminding me this is not a trivial problem
-
https://www.alibre.com/buy-now/?utm_campaign=**LP Branded&utm_source=google&utm_medium=cpc&utm_content=408493471432 Alibre Atom&utm_term=alibre atom&gclid=Cj0KCQiAg_KbBhDLARIsANx7wAwbfAu8VMNWPa1Nt4-KjVzSoIKDKkib7w_CdTL3GZ2ehcDmqu…
-
Nice. look forward to that API add. that's the door to co-simulation.
-
@andreac91 see attached using method above. You should be able to delete any number of layers to achieve your desired result.
-
use the extrude command in mesh tools. you can extrude with a thickness and layers that will match your existing concrete.
-
In case you need solid fill of concrete in the middle, here's an extra trick you might need:
-
If the mesh is regular, you can use the select tool to directly apply to element faces. if that's not the case, consider creating a small regular shaped very thin block that you can constrain to your beam. this would also allow you to swap in and ou…
-
I have to admit that going from ANSYS to CCX made me abandon all those sticks and shells that we used to use in our models. For AXI models, I find it just as easy now to make a quick sector model and call it a day.
-
@Sergio definitely a reasonable option, but in many cases we are dealing with these things after the fact, as a STEP (from Solidworks or Inventor or Creo) so I would prefer a way to correct things "after the fact". What I find interesting is that t…
-
We use Solidworks/Creo/Inventor depending on the project, and unfortunately come across CAD like the attached figure more than we'd like. Meshes look awful from GMsh and Netgen just fails. I need to find a standalone like SpaceClaim without bloated…
-
6-8 processors, then significantly diminishing returns
-
If you name your CONTACT or TIE surfaces using "sequential" names, for example, S101,S102,S103,S104... such that the surface pairs are S101/S102, then S103/104.... The surfaces will be listed in the Named Selection in surface pair order. You can th…
-
@dculp - this is also posted in the Python API Scripts post Solve then Save: mw.solve() mw.save() Use: "C:\Program Files\Mecway\Mecway16\mecway.exe" aaa.liml script solve_then_save.py you can refer to a path if the python script is stored el…
-
For your time variant load, you can actually cut and paste fairly large files (time, value) directly into the table definition in Mecway. Another way to do this is to define a dummy unit load, write your CCX input file, then clip the load step into …
-
I have been using ccx_dynamic.exe in 2.20. it executes pastix unless you are doing modal, then switches to pardiso. I have found it to be more robust than previous pastix releases. it also lets you set to pardiso if you need, and can be done with a …
-
I have been using a solve_then_save.py script, runs and saves to original name, and you can do this externally without flipping a switch inside the Mecway database. works great.
-
Node pick center for Mesh Tools is great!
-
@prop_design, I'll keep you concerns in mind. I am finding that it is running faster, and also in cases where the older Pastix crashed, the 2.20 version ran. I can always override by using Mecway Modify Keyword on the *STATIC command, but so far so …
-
This is our 68 step process, similar to @disla. But I think that once the edge is selected, the end result could be automated with scripting, or maybe put on the "new features" list for @victor
-
I'm enjoying this thread, please don't skimp on the details We do gears, and I would consider us "non-ISO hacks". But some things I have learned: I take the time to make a good hex mesh. With some simple extrudes or slightly less simple sweeps f…
-
options 2 and 5 are probably your best best in post at top of this thread. Pastix is often the fastest, but can sometimes be flaky, so keep Pardiso around.
