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Finite Element Method

Wei Hong's picture

Inhomogeneous swelling of a gel in equilibrium with a solvent and mechanical load

Submitted by Wei Hong on Wed, 2008-05-07 20:45.

A network of polymers can imbibe a large quantity of a solvent and swell, resulting in a gel.  The swelling process can be markedly influenced by a mechanical load and geometric constraint.  When the network, solvent, and mechanical load equilibrate, the gel usually swells by a field of inhomogeneous and anisotropic deformation.  We show that this field in the swollen gel is equivalent to that in a hyperelastic solid.  We implement this theory in the finite-element package, ABAQUS, and analyze examples of swelling-induced deformation, contact, and bifurcation.  Because commercial software like ABAQUS is widely available, this work may provide a powerful tool to study complex phenomena in gels.


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N. Sukumar's picture

Postdoctoral Position at UC Davis in Computational Materials Science

Submitted by N. Sukumar on Tue, 2008-03-04 20:16.

Update: The position has been filled; thanks to all who responded.

A post-doctoral position is immediately available at UC Davis. The individual will work on a joint project led by myself and John Pask at LLNL on the development and application of a new finite-element based approach for large-scale quantum mechanical materials calculations.


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RaminBabaei's picture

Need help about nanocomposite materials

Submitted by RaminBabaei on Tue, 2007-11-20 07:38.

I am Ramin Aghababaei , new PhD student at Mechanical Department of National University of Singapore.


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Ajit R. Jadhav's picture

Why not use FDM in solid mechanics?

Submitted by Ajit R. Jadhav on Sun, 2007-05-27 10:40.

Finite Difference Method (FDM) and the related techniques such as FVM, are often found put to great use in fluid mechanics. See any simulation showing not only streamlines but also vortex shedding, turbulent mixing, etc.

Yet, when it comes to solid mechanics, Finite Element Method (FEM) is most often the method of choice. Actually, FEM is probably the *only* computational method used in solid mechanics. Most books on solid mechanics and structural analysis do not even mention FDM. A few that do, restrict FDM only to the Laplace's equation and the bi-harmonic equations--not to the general stress analysis problem in 3D.

Why is this so?


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Roozbeh Sanaei's picture

Open Source Finite element packages

Submitted by Roozbeh Sanaei on Tue, 2007-02-27 18:07.

Open Source Finite element packages

For more Information:

HTTP://WEBLOG11.GOOGLEPAGES.COM 

 

 


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Robert Gracie's picture

A new finite element method for dislocations based on interior discontinuities

Submitted by Robert Gracie on Wed, 2007-01-10 20:19.

Comments and feedback of the following paper would be appreciated.

Abstract:

A new technique for the modelling of multiple dislocations based on introducing interior discontinuities is presented. In contrast to existing methods, the superposition of infinite domain solutions is avoided; interior discontinuities are specified on the dislocation slip surfaces and the resulting boundary value problem is solved by a finite element method. The accuracy of the proposed method is verified and its efficiency for multi-dislocation problems is illustrated. Bounded core energies are incorporated into the method through regularization of the discontinuities at their edges. Though the method is applied to edge dislocations here, its extension to other types of dislocations is straightforward.


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N. Sukumar's picture

FEM in one dimension

Submitted by N. Sukumar on Wed, 2006-12-20 07:41.

A very short blurb on finite elements in one dimension.


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