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  1. amtrak17

    Knurled Interference Fit Analytical Analysis

    Thanks to all for the comments and answers. This is resolved for me now. Looks like testing will be the only way to have a reliable estimate.
  2. amtrak17

    Torque Required to Strip Aluminum Thread

    I agree with MikeC88's calcs and comments above. I changed my friction coefficients to give the same 0.52 K value and got the same. This is a more conservative assumption on the resulting pre-load due to torque. Ultimately the hardest part is going to be obtaining an appropriate K value that you...
  3. amtrak17

    Torque Required to Strip Aluminum Thread

    Right, friction coefficient is based on material surface properties alone, nothing else. Also note that friction coefficient and K (torque coefficient) are not the same thing. You will have to calculate K from friction coefficient based on JIS B 1803 or similar formula. Also keep in mind that...
  4. amtrak17

    Knurled Interference Fit Analytical Analysis

    Those are good ideas, and I think your understanding of the mechanics of the fit are correct. The operational loading is purely torque. I am performing a Monte-Carlo type analysis to simulate the range of shaft/bore diameters and come up with a statistical range of interference at that press-fit...
  5. amtrak17

    Torque Required to Strip Aluminum Thread

    There are pretty good friction coefficient tables out there. If you actually have the 2 materials on hand you could simply measure the true friction coefficient by placing a block of one on top of a block of the other and seeing at what angle the top block slides. Static friction coefficient =...
  6. amtrak17

    Torque Required to Strip Aluminum Thread

    I would approach this by the method outlined in MIL-HDBK-60 (Also found in Machinery's Handbook). You can solve for your applied load based on torque of 16 N-m and an appropriate k value. Be sure to factor in error for load accuracy based upon which method you are using to torque. A torque...
  7. amtrak17

    Knurled Interference Fit Analytical Analysis

    thread404-213125 I am looking for a way to analytically determine stresses on a knurled interference fit. The referenced thread above was seeking the same, but unfortunately no one actually answered the original question. I am not interested in whether or not a knurled press fit is a good idea...

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