Stuck? 
support@mecway.com
support@mecway.com
Mecway
FEA
Victor
About
- Username
- Victor
- Joined
- Visits
- 4,659
- Last Active
- Roles
- Administrator
Comments
-
For beams, you might also want to reverse their longitudinal (U) axis, which is Mesh tools -> Invert.
-
Yep, that looks fine except GPa/m. That formula makes the elastic layer between the parts roughly 10 times stiffer than the part whose thickness you used.
-
Transfer displacements from solution should be OK. Just set the time slider to the step you want before using it.
-
I think you have to use *SURFACE BEHAVIOUR for that but I've never used it so not sure. *TIE (Called *TIE (CCX) in Mecway) is a hard connection made with MPCs, similar to the default bonded contact. PRESSURE OVERCLOSURE=TIED (called Elastic (*CONT…
-
That's gone, sorry. Some of its use cases can now be done with formulas in Loads & Constraints -> element orientation.
-
The web and flanges of the stiffener are only connected together at a few discrete points instead of continuously. This is partly because the meshes aren't compatible. You can see the gaps with View -> Open cracks. Refine most of the web elements…
-
The mesh for the stiffener has some incompatible parts where the outer edge is refined separately from the rest. I recommend deleting the whole outer row of elements because it's going to be difficult to repair. There are two ways to have multiple…
-
That's a limitation that it doesn't work when it's displaying multiple variables together, sorry. Here's an example of a formula for absolute value of longitudinal stress in MPa.
-
Version 10 will probably have max and min functions added to the formula tool so you'll be able to create a new plot that way. To set the contour plot range to fit a selected component, right click one of the selected elements and choose Fit contou…
-
Do you want to show the maximum value of normal+bending stress over the cross-section of the beam? I can't think of a way to do that, but you can at least see both sides simultaneously using any of the 4 "point #" stresses in the older version of yo…
-
They have to add up to 360 degrees or the solution will be wrong (internal solver) or fail (CCX). There is some redundancy there and in principle, it could estimate the number of segments from the mesh. But there may be ambiguous cases like the node…
-
With the internal solver, the number of output segments is only used for modal vibration. In other analysis types, the results are identical for each segment so it would mostly be cosmetic to show them. I agree that this should though, it's just mis…
-
The internal solver can be very slow when there are lots of constraints. If you can use CCX instead, that would be faster. Sergio - the inefficient writing of some BCs is a tradeoff in complexity of Mecway's code vs complexity of the resulting .inp…
-
I don't see that you need the at-origin beam or the constraint equation coupling it since the 3 sensor beams on the plate also show the same 90 degree rotation. I would also use a soft material for those beams to ensure they don't artificially stiff…
-
This dot product stuff is for measuring rotation in the solution, not prescribing it. It doesn't let you specify the displacement amount as a formula in terms of position. Do you really want to leave them free to move radially and axially as oppose…
-
Yea, Mecway can't calculate the center of rotation. Sorry if it looked like I was explaining basic maths. I wrote out those formulas in Mecway's formula format so you can copy and paste them in to get a feel for its capabilities with minimum frustr…
-
Yes, the formula gets calculated for each node and can be a function of that node's displacement and position. I don't completely understand what you mean by the center of rotation being displaced. If you know the center of rotation then you can us…
-
The display shows the midplane in the same place the solver will see it, So being offset like this can have a significant effect bending moments, depending on how it's loaded. Since the mesher can't find the midplane, you could either move the CAD …
-
I see. Yes, that would save you redefining components every time. I don't have any more suggestions, sorry. You can reverse shell elements with Mesh tools -> Invert, though it will be lost when you remesh it.
-
I use Gmsh 2.16 and 3.06. Some STEP files make it crash doing a volume mesh but others are OK and surface mesh is more often OK. I'm not sure why. How does different thicknesses prevent you merging them in CAD?
-
Some options: * Merge the parts in CAD in advance. * Use bonded contact to join them. * Try Gmsh which seems to be more consistent at keeping same-shaped faces having the same mesh.
-
1. Yes, rotation constraints won't work on solids, and yes, you could use bonded contact to join a beam to a solid then use its rotational DOF with the internal solver. However, it doesn't look like a rotation constraint is appropriate here. The gea…
-
The reason for specifying shell/membrane is just an organizational thing to enable the thickness parameter and disable all the irrelevant beam parameters/etc. The CCX solver expands shell elements to solids so it's not really using a shell formulat…
-
The cutting plane slider (see attached picture) hides foreground parts. If the assembly has different components, it can be easier to hide a component instead. Right click its name in the outline tree and then Hide. Bonded contact isn't automatica…
-
A point that might be confusing is that "orientation" here doesn't affect the shape of the mesh, just the direction that the composite material is aligned with. So disla's (0,z,-y) formulas would make the U axis in the circumferential direction des…
-
Hello Eduart 1. Yes, I think quad8 (quadratic, quad dominant) is best. Quad4 may be OK too. Yes, turn on Fit midside nodes to geometry. That's only off because it sometimes makes badly shaped elements which won't solve. 2. Yes 3. The default elem…
-
Some file types are not allowed so you can zip or rename them. Or sometimes the forum is just flaky and refreshing the page might help.
-
Every point behaves as if it's undergoing a temperature change from the reference temperature to the temperature that you specify for it, ie. ∆T = T - Tref. Internally, it calculates that ∆T, discards the other two temperatures, and uses a generaliz…
-
If the ends are fixed in the horizontal direction, then yes, nonlinear should have less deflection because the sheet would be stiffened by its tension, similar to a catenary. If one end is free to slide horizontally, then I'm not so sure but I woul…
-
The box that's initially stationary has 3 unconstrained degrees of freedom making it free to slide around however it wants in the XZ plane. It requires 0 force to do that, so it can easily be moved by anything. Adding a floor object with friction s…
