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Ken Welch

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Everything posted by Ken Welch

  1. Ken Welch


    This creates local washer bonded regions around the bolts at the faces of the bolted parts. Otherwise (left unchecked) the entire face between the parts is bonded and this can over stiffen the model.
  2. Not at this time. Today, SimSolid only reports the final fully stressed state.
  3. Couple of things: Wrong boundary condition. You were using elastic foundation. Better just to apply sliding on 3 surfaces Under converged. When looking for stress, better to use 4-passes and check on Adapt to features. See results below. Now stress are located in the slot as expected. Note: due to the fact SimSolid uses a fixed results plotting grid for contour display, stress distribution can appear more fragmented in narrow slots as compared to FEA. This is an artifact of the viz and not of the solution. Here is one more plot with the legend adjusted close to that used in FEA.
  4. Automatic detection of contact is based on two tolerances -- max gap and max penetration between the parts and one resolution setting -- Standard, Enhanced, High. If your parts are badly misaligned, you may need to adjust these a bit. As an alternative, you can use fillet welds. Try to group select a number of parts and find all edge welds. With Bolts and Nuts may apply tightening loads. The restriction is that there must be a hex head on both. See the training guide for more details or contact customer support.
  5. Yes, we agree. Already on the road map
  6. Would have to see the model, but I believe the issue may be the local coordinate system is not propagating between design studies. You may need to recreate it in the second study.
  7. Wow, many questions. Probably best to talk to an Altair technical representative directly but I will try to answer a few: Spots are found in the Project tree under the part that they are defined on Not possible to create spot patterns at this time Cannot suppress a spot, just don't apply any BC to it and it will be ignored in the simulation Use Add/edit part connection to create connection between two specific parts Right click on a part and select Review part connection. this will only show you the connection to the specific part you selected In the project tree use CTRL and SHIFT to select multiple sub-assemblies then right menu select and Hide/Show
  8. There are a number of resources to look at. There are 2 white papers – one more general, one more technical. There is also several pages of concepts in the Fast start training guide. Look at slides on pages 5 through 10.
  9. The remote force will create the moment.
  10. The latest build, now has a new RMB menu that should do what you want. See the HIDE>Parts of different material menu. Regards, Ken
  11. Good idea. We do not do this currently. You can view parts by material in the Assembly Show menu (right mouse select Assembly in the project tree) but you can’t save the selection at this time. Have to think how to do this easily in the UI. Will add this to the enhancement request list.
  12. It most likely depends on the shape and density of the connections. For example two parts can be oriented such that (within the connection tolerances specified) they only connect at one or two points. This may be sufficient to satisfy the initial rigid body checks, but when the polynomial order get raised in the 3rd pass it becomes ill-defined. Go back at look at the connections, especially along thin edges or where very small parts are located.
  13. You can do the following:– this problem is a 2D or axis-symmetric problem. You can create a slice of the geometry and apply sliding to the sides of the slice– the lid is fixed, the ridge is in contact with the gasket. Apply vertical displacement to the ridge. The displacement is equal to the gap between spacer and the lid.– apply NL material to the gasket– watch the reaction force vs displacement at the ridge bottom
  14. Today, SIMSOLID does not have a point mass concept. You can set any part to “rigid” and then specify the mass explicitly, say 100 kg. That said, you would need to have to general shape of the component that your are modelling the mass for.
  15. We do not need even the CAD model, just share the ssp any way (Drpbox, google drive, etc.).
  16. The reasons for numerical instability can be: – insufficient contact resolution. Particularly important in case of large frames when the global size is much bigger than size of beams cross-sections (may result in internal hinges). Remedy: increase the resolution in Find Connections dialog – significant part overlaps which makes connections not physical – significant distance between connected parts (reduce gap tolerance) – invalid geometry (you can check geometry quality by launching diagnostics from Assembly toolbar The best way is to send us the model for investigation.
  17. If I understand you correctly, here what you should do: – open existing Simsolid project. This project has one baseline design study, and, perhaps, some other design studies – bring into the project revised assembly from Onshape. The assembly will be placed into new design study. For parts in new design study which are the same as in the baseline all loads, constraints, and connections are automatically inherited as they are in the baseline. – due to the geometry revision some boundary conditions and connections may become incomplete and set in red in the project tree – be careful to check them You can assign any design study as a baseline. Then next time you bring revised geometry in, new design study will inherit boundary conditions and connection from the new baseline.
  18. What do you mean by “posed”. In static analysis you need to remove rigid body motion of the structure. There must be sufficient boundary constraints to do this. “Immovable” removes all motions, “Sliding” removes normal motion, but allows movement along a face (tangitial directions), etc. For a structura resting on ground, the easiest method is to just pick the surfaces that touch the ground and set them to immovable. If you want a “soft” connection, you may consider using an spring support (sometimes called and “elastic foundation”) constraint as well.
  19. Just hover the cursor over the Clip plane button, the detailed tip will pop up with all the explanations.
  20. For moment application, use the SIMSOLID remote load dialog. Open the dialog, pick a set of faces (or optionally spots) to apply the moment to, Specify the location of the moment and the moment values.
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