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xalan001
Posts: 1
Registered: ‎04-27-2012
Message 1 of 2 (337 Views)

Simulating Torque in Autodesk Inventor or Autodesk Multiphysics

337 Views, 1 Replies
04-27-2012 01:58 PM

Hello Everyone,

 

I'm currently modeling a screw for a spinal implant for my Senior Design project and I am trying to analyze the amount of torque that it can withstand before breaking. I would like to simulate the screw being inserted into bone and see the pressure that the thread undergoes, however, I've only been able to apply forces along the Z and Y axis.

 

I would appreciate any help regarding this issue. Thank you very much for your time and help.

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henderh
Posts: 650
Registered: ‎06-07-2007
Message 2 of 2 (322 Views)

Re: Simulating Torque in Autodesk Inventor or Autodesk Multiphysics

04-27-2012 05:47 PM in reply to: xalan001

Hi xalan001,

 

  You can apply a torque load instead of a force, it is labeled as moment.

 

  I'm not that familiar with bone material, but I assume that the screw threads do not undergo plastic deformation.  It is non-trivial to do a non-linear analysis on threads...as only 2-4 threads hold most of the load at least when we're dealing with metal on metal.

 

  If you need to include the compliance of bone, I suspect bone may have a non-linear stiffness [Edit: or it is considered a brittle material].  Therefore, this may require Autodesk Mechanical simulation.

 

Hope this helps...



Hugh Henderson
Simulation QA Engineer
DLS
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