[Geoqus] Applying pressure

[LUEKE Jens]

There is a specific procedure in Abaqus that iteratively establishes an initial geostatic stress field that is in equilibrium with applied loads (e.g. surface tractions, gravity) and boundary conditions. This procedure can be used with or without accounting for pore pressure and temperature degrees of freedom, and in many cases this stress field can be established while keeping resulting displacements close to zero. The procedure is outlined in chapter 6.8.2 - "Geostatic stress state" of the Analysis User's Guide for Abaqus 6.14. See also e.g. Chapter 10.1.3 - "Axisymmetric simulation of an oil well" of the Example Problems Guide. Maybe this procedure could be helpful in achieving a stable/balanced internal stress state, if you haven't used it already.

Dr.-Ing. Jens Lüke
Simulia Central CSE Technical Sales Specialist
Dassault Systemes Deutschland GmbH, Aachen


[Geoqus] Applying pressure
Kevin Smart ksmart at swri.org
Thu Nov 21 18:08:49 CET 2013

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Depending on the complexity of your model boundaries, you may be able to achieve the desired internal stress state with the "surface traction" load option.  If you select the "general" traction type (rather than the default "shear"), you can specify loading vectors that are oblique to the surface.  I've used this approach successfully for relatively simple models but it can be a bit tedious specifying all the necessary surface loads to achieve a stable/balanced internal stress state.

--Kevin

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From: Geoqus [mailto:geoqus-bounces+ksmart=swri.org at lists.ruhr-uni-bochum.de] On Behalf Of Coblentz, David
Sent: Thursday, November 21, 2013 10:11 AM
To: Geoscientific Abaqus User Group
Subject: Re: [Geoqus] Applying pressure

I've only used the pressure boundary condition for applying stresses and I've had to add a margin with sides at a particular angle to apply rotated stresses.  Not very convenient, to say the least.   I'm interested to hear if any other users have a been method.

Regards,
David Coblentz

From: Hani Farouq Abul Khair <hani.abulkhair at adelaide.edu.au<mailto:hani.abulkhair at adelaide.edu.au>>
Reply-To: Geoscientific Abaqus User Group <geoqus at lists.ruhr-uni-bochum.de<mailto:geoqus at lists.ruhr-uni-bochum.de>>
Date: Wednesday, November 20, 2013 4:41 PM
To: "'geoqus at lists.ruhr-uni-bochum.de<mailto:'geoqus at lists.ruhr-uni-bochum.de>'" <geoqus at lists.ruhr-uni-bochum.de<mailto:geoqus at lists.ruhr-uni-bochum.de>>, "'abaqus at yahoogroups.com<mailto:'abaqus at yahoogroups.com>'" <abaqus at yahoogroups.com<mailto:abaqus at yahoogroups.com>>
Subject: [Geoqus] Applying pressure

Hi All

I am trying to apply pressure as boundary conditions to simulate the principle stresses in Abaqus
Is it better to use pressure as the load or there is another way of doing it?
Can I assign the load as a pressure in angle?

Kindly if anyone can help I appreciate it

Regards

Dr. Hani Abul Khair
Research Fellow
Structural Geology / Geomechanics

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