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How to assign material properties to different elements after meshing?
Posted 11.02.2022, 03:15 GMT-5 LiveLink for MATLAB, Modeling Tools & Definitions, Structural Mechanics Version 5.6 7 Replies
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Hi, I'm a new-to-comsol. Now, I'm working on modeling, and here is the problem.
The above figure shows a FEM model built by other researchers using a structured mesh. The different colors mean that the elastic modulus vary with the element location. The values of elastic moduli follow certain distribution, for example, weibull distribution. I want to setup the same model in comsol multiphysics. Now, I have built a 3D structured mesh. But I'm not sure how to assign material properties after meshing and how to make material properties of elements follow weibull distribution. Livelink for matlab, I guess, may fulfil my thoughts. Need some matrix to be extracted and re-edited? Are there some similar cases available? Please, give me some ideas about it. Thanks a lot!
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If it is not necessarily tied to the elements but more to the geometry, it is worth considering that you can define material properites that vary with coordinates, a la density(x)=10*(x-2).
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
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I think this blog post may help you:
https://www.comsol.com/blogs/how-to-generate-randomized-inhomogeneous-material-data
-------------------Henrik Sönnerlind
COMSOL
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If it is not necessarily tied to the elements but more to the geometry, it is worth considering that you can define material properites that vary with coordinates, a la density(x)=10*(x-2).
Thanks for your reply. I still wonder that is there any chance that define element material properties by its location (e.g. the coordinate of the element centre)? Would you please give some ideas or methodologies? Thanks!
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I would think that applying material properties that are a function of the spatial coordinates such as rho(x,y,z) are the better alternative to assigning the property to the elements. Well, may be a matter of taste ...
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
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If it is not necessarily tied to the elements but more to the geometry, it is worth considering that you can define material properites that vary with coordinates, a la density(x)=10*(x-2).
Thanks for your reply. I still wonder that is there any chance that define element material properties by its location (e.g. the coordinate of the element centre)? Would you please give some ideas or methodologies? Thanks!
I don't really know to be honest. I would submit as a support case.
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
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The operator centroid() returns values at element centroid. Thus, centroid(X) should be useful here.
-------------------Henrik Sönnerlind
COMSOL
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I think this blog post may help you:
Thanks for replying. In the blog you mentioned, material properties are defined as functions varied with location. It is a good idea, but less suitable for me. Maybe extract some matrice related to material properties, element numbering and element coordinates, and then re-edit them in matlab is an acceptable way? Any suggestions are welcomed. Thanks!