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Bridgman Paradox?! Masters thesis

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Old   May 26, 2014, 07:56
Default Bridgman Paradox?! Masters thesis
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Kjetil
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Hello!

Im working on my masters thesis, where Im looking into something that some would say is an unexpected answer.

The setup is very simple:
Arnfinn Solution.jpg

Step 1: Faced with the seemingly trivial physical problem with a pressurized chamber with a bar protruding the chamber walls through sealing glands, most people opts for solution 1; no resulting axial force; T =0.

Step 2: By reversing the pressure, there is 100% agreement that solution 2 gives the right answer. A compression force corresponding to the overall pistion effect.

Step 3: Most people agree that lowering external pressure to negative gives a suction force and corresponding tension in the piston of T =∆pA.
Then, the question is: Is not step 3 identical to step 1?

And here are some screenshots from Openfoam:
sigma xx.jpg

sigma yy.jpg

sigma zz.jpg

Von Mises.jpg

So, Why is there no axial force in the rod when pressure is applied from inside? The rod will fracture. Do you have an idea about why?

Any ideas and/or suggestions are appreciated!
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Old   May 30, 2014, 04:40
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I hope I posted in correct subforum?
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Old   June 3, 2014, 10:30
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Bump......
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Old   June 6, 2014, 05:52
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No ideas? no opinions?
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