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  1. mmar2087

    FBD to match FEA

    Hi. The problem is solved. It was a boundry condition problem due to over constraining. Using reaction forces and minimum constraint gives expected result. Thank you for your advices.
  2. mmar2087

    FBD to match FEA

    Hello. I have a case, that probably is easy to explain, but that I'm stuck on for the moment. In picture below there are 3 plates connected to each other by guide pins. The left and right side of the 2 outer plates are fixed. Blue and red areas are cavities where a pressure is applied. In this...
  3. mmar2087

    Yield/start for S-S curve FEA?

    You are correct about the behaviour in SW Simulation regarding linear behaviour below the first point in the s-s curve. It ignors input for E-modulus and instead calculates this based on the first point in the s-s table. Your start point should, as TGS4 mention, be the proportional limit, where...
  4. mmar2087

    Load Distribution on plates

    If you use a remote load and connect it to the 4 plates, the loading will be spread evenly on them (that is if the center of load/mass is in the center of the 4 plates)
  5. mmar2087

    Load Distribution on plates

    I'm not sure if I understand your description. But one obvious thing when looking at your file is that the loading looks unrealistic. You put the load directly on the 4 plates which bends the plate's outer edges. In reality if you put a weight on your structure the stiffness of the weight will...
  6. mmar2087

    what FEA is

    There is a problem with overconfidence of FEA results from people using the softwares with low engineering knowledge and low knowledge of how FEA works. The cad-embedded softwares has increased this problem, not because they are bad, but because the education that the resellers give is quite...
  7. mmar2087

    Y shaped pipe with tricky boundary conditions

    Well, I'm no expert in Flow Sim. But i would set the mass flow at the inlet and the atmospheric pressure at the outlet. Then you look at the pressure at the inlet. Inlet pressure - Outlet pressure = pressure drop
  8. mmar2087

    validating simulation results

    lmrg5387: First you need to understand if it is "real" stress or singularity. Convergence methods are given above. If it is "real" stress, it converges, you just have to consider if it is a problem or not in your design. Do this stress peak go beyond yield in your simulation? Then if you do a...
  9. mmar2087

    Bolt analysis, applying preload

    Here you have some ideas on how to model bolts and their preload. http://blog.gxsc.com/graphics_systems_solidnot/2013/09/bolted-joints-in-fea.html
  10. mmar2087

    How can I verify that FEA analysis(like autodesk inventor and solidworks) match real world?

    1. I can see that each color represent specific value of stress. Does the red color mean it will break at that point? Of course not, it is just a visualisation of how stress developes in the part. Often the autogenerated "Von Mises" stress plot sets the red band to the highest stress level in...
  11. mmar2087

    Stress-Strain curve into FEA

    Thanks for your answers! rb1957: I made a mistake in my thought, where I considered the reported Rp0,2 as the yield point (and start point in my FEA material model) I importing the SS curve as it was, removing all values below 120MPa that is "linear", and then added load up to 180MPa, the...
  12. mmar2087

    Stress-Strain curve into FEA

    rb1957: You're right, I have all information that I need for the SS curve, but I don't understand how to use it correctly in FEA. The first point in my material file should be "yield" point, so 0,002 for strain and 182 MPa for stress according to result from the tensile test for sample 215. But...
  13. mmar2087

    Stress-Strain curve into FEA

    Hi. Perhaps a stupid question, but here I go.... How do I input stress/strain data from a tensile test into an elasto-plastic material model in FEA? The program states that the starting point should be the yield point. Attached You'll find the results and graphs from 2 tests bars. Result on...
  14. mmar2087

    Where is my neutral axis? Position differs in first and third principle.

    Hi. Not sure if I understands your problem. It would be easier if you uploaded a picture. But anyway, I believe that your problem is due to scale settings when you post your results. See the attached pictures. If you ignore the stress concentrations in the corners due to my bad BC:s, does this...
  15. mmar2087

    Roller Support & Part Interaction within Simulation

    Hi Perywinkle. If i interpret your pictures correct: - You have an assembly made up of solid elements only (no beams or surface elements). - You have two loads, gravity and an evenly distributed force. - You have 2 roller/slider fixtures. - The only contact is the global bonded one. If this...
  16. mmar2087

    "Nested" parts and no penetration

    You don't need to be in the non-linear module to handle contacts. In SW, contacts, large displacement and "in plane effects" (stress stiffening) are available in the static analysis. I would try to add a fixture on one node on the inner structure and lock it only in the axial direction to...
  17. mmar2087

    Boundary Conditions Simulation

    Well, I have Sim Professional and in the loading folder there are only force, pressure et.c. You have the remote load option, but this is not the same as a displacement BC. To put a displacement BC you go inte fixtures, select for example "on flat faces" and then set the "normal to face" to a...
  18. mmar2087

    Boundary Conditions Simulation

    Hi. Displacements are not found under loads, this is a fixture in SW. You can for example use the "use reference geometry" fixture and specify a translation.
  19. mmar2087

    Symmetry Error in Solidworks Simulation

    Hi Marty. I'm not sure why symmetry isn't working. But the easiest way to solve this is to use another fixture. You can use "on flat surface" and restrict movement in the normal direction, and this is will do exactly the same as the symmetry restraint.
  20. mmar2087

    "Nested" parts and no penetration

    It sounds strange. Do you have a picture on this setup? The global bonded condition (default) only works if the parts have initial contact so this shouldn't be the problem in your case. If you manually add a no penetration contact (also works with bonded) the part don't have to have initial contact.

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