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triaxial test external stress and boundary load

Posted 14 sept. 2016, 20:15 UTC−4 Computational Fluid Dynamics (CFD) Version 5.2a 0 Replies

Haoyu Shi
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I want to make a triaxial test for cylinder sandstone sample, The confining pressure is about 150MPa. In the solid mechanics mode, should I use external stress or boundary load for 150MPa? When I use boundary load, the mode is not symetrical in terms of strain or displacement of top and bottom. When I use the external stress, it can only works with lower confining stress,less than 10MPa.

So what is the different between external stress and boundary load?
triaxial test example, but it use triaxial stress:
www.comsol.com/model/triaxial-test-9702
www.comsol.com/model/triaxial-test-9702
0 Replies Last Post 14 sept. 2016, 20:15 UTC−4
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Hello Haoyu Shi

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