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Recent content by Simfinite engineering

  1. Simfinite engineering

    Trouble Meshing Imported SolidWorks Part in Abaqus – Need Help with Hex or Hex-Dominated Mesh

    Your geometry is a repeating segment as far as I can tell. Easier to just do one part (as I do here) and repeat it. If I try to partition all in one go there are problems because of small inaccuracies, which is why I first partitioned over the middle, and then only did one turn. Maybe it's...
  2. Simfinite engineering

    Typical dynamic loads generated by vehicle engine, driveshaft, and dynamometer

    Get the relevant norm (e.g. ISO 8528-9 for gensets, for sure there is an ISO / EN or other for your specific application) which gives the maximum allowed vibration, and use that one for your layout. You should have the allowed vibration in function of frequency of the sensitive equipment, and...
  3. Simfinite engineering

    Radiator Cooler Design

    Don't cool it in the same loop, get a cooling water loop and use water heat exchangers with a thermostat & bypass. The radiator manufacturer should be able to tell you how big you need to size it depending on the temperatures and location.
  4. Simfinite engineering

    Journal/Sleeve Bearing Clearance

    Yes and yes. A typical value is 0.001 of the shaft diameter. But this can vary widely depending on: - application: passenger cars will have less clearance, heavy power pumps will have larger clearance. - oil used & oil temperature - rotational speed & load - ... And yes, journal bearing...
  5. Simfinite engineering

    Help On Lowering Suction Air Temperature

    What is the increase in charge air temperature? 15% derating is high. 102F is not that high, so it seems mostly to be a cooling issue because of the high humidity? If your engine has knock protection and you can follow up on everything, I'd just derate less (depending on charge air temp, ~ 5%...
  6. Simfinite engineering

    Are constitutive models of stress-strain relationships true values or engineering values?

    Depends on your settings, most notably NLGEOM and your element formulation. I've dug up the relevant page in the manual for you: Stress and strain measures The stress measure used in Abaqus is Cauchy or “true” stress, which corresponds to the force per current area. See “Stress measures,”...
  7. Simfinite engineering

    Yield Criteria

    From my understanding of your question, the conclusion that you should make is that you do not know what von Mises stress is. Unless you are performing a uniaxial FE test, why would you be surprised that the von mises yield criteria is not the same as the maximum principal stress theory? Which...
  8. Simfinite engineering

    The best way to protect a bolt from loosening?

    Cheapest solution (similar to your welding solution): Take a hammer & pin punch and hit (in between) the threads of the bolt & nut after tightening (i.e. a DIY deformed thread lock nut).
  9. Simfinite engineering

    Tapped Thread Yield Limit

    If I understand you correctly, you just want the yield strength of whatever material your hole is tapped in? And for shearing, just divide by sqrt(3).
  10. Simfinite engineering

    Frequency analysis with beam and solid elements

    are you looking at stress or force? how refined is your mesh?
  11. Simfinite engineering

    Frequency analysis with beam and solid elements

    The beam elements should EXACTLY match the solutions by hand. And if this is a simple supported structure and your model is good, the solid elements should give a more precise answer. But, as mentioned, if the beams are slender, difference should be small. For thick beams, eg. check with roark...
  12. Simfinite engineering

    Ngleom option

    when you want to incorporate non linear effects ... so all large strain cases, all non linear material cases, etc.
  13. Simfinite engineering

    needle insertion into a soft tissue

    What you want to do is put a slender beam in a (relatively) soft material: search for deep pile foundations: eg. http://www.simulia.com/download/pdf2009/Qiu_SCC2009.pdf
  14. Simfinite engineering

    Latex material

    Depends if you want to take into account the time (rate) dependent behavior or not ... Steel is also viscoelastic. Anyway, if you are going to have large deformations, a hyperelastic material law will probably be better for all purposes.
  15. Simfinite engineering

    Modelling a rope/chain connection

    Model the rope as truss elements without compressive strength, there's a checkbox in either the material or section widget.
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