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torque simulation gets multi results with different fixtures

Question asked by Jing Liu on Jan 16, 2015
Latest reply on Feb 4, 2015 by Mike Pogue

I am trying to run a simulation on this small assembly: a copper stud inserted into a plastic housing (nylon 6/10), with no other restrains. Apply torque on the stud and run the simulation to see how much stress is generated by the stud on the housing.

assem.pngassem section view.png

 

1. I set a global non-penetration contact

2. these following two surfaces are set as pin connectors

stud face.pnghousing face.png

3. 3.5 Nm torque is applied on the stud as:

torque.png

Now here comes the questions:

when I set the fixtures like the following (the 4 side surfaces and the top surface of the plastic housing):

fix all surface.png

I got the result as the following (the max stress is about 197MPa):

fix all result.png

 

when I fix only the top surface of the plastic housing, like this:

fix top surface.png

I got the result as the following (the max stress is 350MPa):

fix top result.png

 

 

which one makes more sense? is there any other problem with my simulation input?

 

thank you!

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