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  1. tonyel

    Nonlinear elastic orthotropic axisymmetric model - any ideas?

    Dear Esteemed Eng-tippers I'm trying to model a device made of stiff, nonlinear elastic filaments wound around a mandrel, then potted in epoxy. I blithely assumed that this would be a doddle, using one of the dozens of Ansys material models, but I'm actually struggling to find an appropriate...
  2. tonyel

    tyre coefficient of friction vs speed

    The way I see it, there is a straightforward chain - the force created by the friction of the pad on the rotor, multiplied by the difference in radius, must equal the force created by friction at the tyre/road interface. Since (using the simplified friction law) the force is just proportional to...
  3. tonyel

    Modeling hardness variation in core developed steel via FEA

    You can do the FEA with no problem assuming it to be homogenous material. The only material properties that you need to put into a (linear) FE analysis are the YM and poisson ratio. The stress results will be fine, because none of the heat or other treatments will have any effect on the Young's...
  4. tonyel

    tyre coefficient of friction vs speed

    This question has been bugging me since I did a 'driver training day'. It was stated with great authority by the trainer that, contrary to standard practice (and what I had always done) it was more effective to brake harder (ie, more pedal pressure) at the start, when the car was travelling...
  5. tonyel

    Ansys thermal contact not working

    Yep - set Keyopt 1 to 2. I've tried this all sorts of different ways, and sometimes it seems to work and other times not. The strange thing is that, although at first glance it seems to have worked fine, the results are not correct. There is some heat flow across the contact layer, but the...
  6. tonyel

    Ansys thermal contact not working

    Yes - keyopt 12 set to 5, which I believe should mean that they are always bonded.
  7. tonyel

    Ansys thermal contact not working

    I've made a model with conta174 and targe170 elements to tie together layers with dissimilar meshes. I thought it had worked fine, until, as a check, I compared it with a simplified model which had the layers glued together and meshed as one. The results were totally different. Has anyone any...

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