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3D FEM modeling of composite

Xuanhe Zhao's picture

Finite element mesh of 3D composite

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Do you use the free method to mash the composite? What's the ball in it?

Henry Tan's picture

is this composite subject to loading?

Xuanhe,

You might find some of the work that I did on 3-D finite element modeling of particulate composites of interest. The meshes were generated with ANSYS.

You can take a look at my poster here and my unpublished paper here .

Biswajit

Henry Tan's picture

Dear Biswajit,

Good meshes generated.

I saw that half of the meshes are inside of the particles.

However, in your computations the stiffness of particles are much higher than that of the matrix (~10000:1); therefore, why not treat them as rigid so that computations inside the particles can be avoided?

Henry,

I did consider rigid particles in some of my earliest simulations.  However, I don't think ANSYS had any convenient means of specifying rigid materials at that point.  The alternative is to apply displacement constraints at the nodes which lie on the surface of each rigid particle.  I couldn't figure out how to do that either for the general three-dimensional case.  Given that, I am still interested in knowing how ANSYS deals with rigid materials.  Any experts out there?

Also, even though the particles are rigid compared to the binder, the stiffness of the composite is determined essentially by the stiffness of the particles.   Rigid particles tend to give effective properties that are at least an order of magnitude higher than actual (as some simple two-dimensional microstructure suggested).  However, that observation cannot be generalized for lower volume fractions and different geometries because I tested only very specific microstructures.

Biswajit 

 

Roozbeh Sanaei's picture

 I did some analytical work in composite structures with ellipsoidal particles. this work is availabale in journal of computational mechanics. i compared that's results with an adaptive finite element code.

Henry Tan's picture

Dear Roozbeh,

where can I find your paper?

I also got some analytical solutions for a particulate composite material with ellipsoid inclusions.

Debonding of the interfaces between particles and the matrix was accounted for in that analysis.

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