Stuck? 
support@mecway.com
support@mecway.com
Mecway
FEA
disla
About
- Username
- disla
- Joined
- Visits
- 1,711
- Last Active
- Roles
- Member
Comments
-
This is the truss system with ccx and only compresion beams in the diagonals. It is nonlinear (I think it must be nonlinear for this kind of material) Final results are: (+ = tension) Side in Tension. Final Tension 8.999927E+01 N Side in Compresi…
-
Hi, Isn't tension and only compression materials nonlinear behaviors?. Is there a reason why the problem is not approach with ccx solver? Is it because there is not such a variety of beam sections.?
-
Yep, It is ccx. I have finally plot the integration points at the undeformed geometry as reference and interpolated the values known their coordiantes. Thanks
-
HI Victor, I'm comparing the SXZ value at the integration point with the SXZ value from the interpolation tool and they are different. ¿Should I assume the interpolation tool is made from the nodal values?. In case it is, ¿Would this be hard to do …
-
Take a look at he Gmsh manual. https://gmsh.info/dev/doc/texinfo/gmsh.pdf Prepomax has implement most of Gmsh commands in a really amazing way. It is even more friendly than the Gmsh GUI itself.
-
Thanks Victor, I will try that. There is a shell expansion in between so i will have to see how to manage that as new nodes are also created. I also found that unused nodes don’t show in the solution.
-
Sorry, Another question related to this. My main problem is that I'm interested in certain values at the integration points but only those close to a specific face. From the dat file it is puzzling to extract which are the int.points of interest. …
-
Gmsh has an option to mesh only the edges with nodes. It could provide a fast and light "node-mesh" just for reference. If Stp is too heavy to import all at once you could also try to import by parts (even separate files) before merging everything. …
-
Inp file.
-
More like this.
-
Hello, Just curiosity, what is the purpose of this device?. It does not appear to be used to attach anything other than itself to a tube. Normally one of the halves is prepared to be fixed but in this case it does not appear to have any rail or …
-
Right, as far as I have seen frequencies are fine.
-
CONCLUSION : Nowadays, B31 element isn't reliable for modal analisys (2024). DETAILS in the ccx Forum.
-
Files
-
If you are using ccx, beams can also be offset. I would test extensively cause i'm not sure if that's safe to use and how it does affect deflections, stresses, and if it will make any effect. EDITED: Internal also has offset from ver.25.Beam offs…
-
Only Mecway. Handmade. Start with very simple rectangles (10) and later custom refinement. Extrude only at the end.
-
I put in the Y rotation constraint on the advice of the CCX manual after it was failing without it That's weird. I didn't notice that because I always use PARDISO MKL and it has been working fine for me. You are completely right. Adding rot y con…
-
OH, That's new ¿isn't it?. I mean Rigid body definition through a set of nodes instead of surface. I'been doing this manually for a long time . I think y rotation should be free to be a hinge.
-
I have worked a little on the mesh. I have meshed the section and later extrude it. With a good mesh is much faster.(3 min) The FEA model will be better driven imposing a rotation. Be sure to evaluate correctly the forces needed to achieve that rot…
-
Give it a try to Straight. It should do the job. I have edit one of my previous posts: Straight allows the nodes on the line to stretch and change distances in between them while keeping them aligned.
-
This is the fastest rolling set up I can imagine. Not what you first ask as nodes are not enforced to keep aligned but could be valid for small displacements.
-
Hi, If you distribute the load over a certain surface below the plate you could use the rigid body as it is implemented (based on a surface and a REF node). Mecway have shortcuts for some elaborated BC but not all of them.
-
You need custom cards to do that. Reducing all DOFS of an aligned set of nodes to two, requires a rigid body definition of those nodes. (Good moment to remind Victor about this possible improvement ) To keep them in an axis and all body free to r…
-
Hi, ¿Do open radios also have eigen solver.? In that case, do you think it could be worth to use it know the actual limitations in Arpack.
-
Hi, I find the system more predictable using Initial position and velocity as BC. Force seems unpredictable to me as one usually doesn't know the time duration and shape of the initial impulse. Exact solution can be found as a function of x(0) and…
-
This are the You tube file and the simplified 3D Spaceframe file using the last refined set up. Its more work but the result is definitely worth it. Very accurate buckling loads compared to Euler. The buckling values obtained with LBA are those of …
-
Your buckling analysis won’t be right. All the beam and truss elements only have two nodes so the buckling load will not be extracted correctly. I suggest you start with much simpler tutorials and models like the YouTube one. It has a known solution…
-
Good news, Just comment that Victor has been working on this and found a much better and reliable approach than mine. It involves more work to set up the model but he is working to make it easier adding some internal coding. Results are consistent …
-
Would you share one of those models that are giving you issues in NLG?. Light version if possible.
-
I saw this yesterday. It immediately made me recall this post and the uncertainty of load distribution on a four rig scheme, especially close to the detachment point. I hope there were no casualties.
