General Mechanical

General Mechanical

Untightening of a bolt

    • BharanKumarA
      Subscriber

      I have done a simulation of untightening a bolt. I have applied a rotation and extracting the torque from the result. I have applied frictional contact with coefficient of 0.1 at the threads.

    • peteroznewman
      Subscriber
      It would help if you put an image of the geometry in your reply.
      I expect the oscillations are stick-slip behavior.
      Stick-slip behavior can be measured experimentally with the correct instrumentation.
    • BharanKumarA
      Subscriber
      the geometry has two contact regions, one shown in the fig. and the other at the threads, both having a friction coefficient of 0.1.

      Can I find any documentation for such a behavior? and also how can it be reduced?
      I have also run simulations for different friction coefficient values and for a value of 0.2 it appears to be reduced. Can you please explain this.
      /Bharan

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