Super Hard Mesh
Super Hard Mesh
(OP)
Heloo,
So i must mesh a very complex model, formed by a lot of iron bars in contact (see image - onlye reprsent a piece of my model).
Be cause the diameter of the bar is so small (4mm) and there are so many small interactions, abqus need a very fine seed to generate the mesh. I´m using 15 as Aproximate Global size, 0.1* 15 as minimum, and 8 seeds per circle (mesh curvature control. If i enlarge this values abaqus wonté generate mesh.
I really need to genreate a more coarse mesh. Any ideas ? There are so many contacts to do partitions in every single one.
In ansys, the automatic mesh tools handle this problem very weel.
So i must mesh a very complex model, formed by a lot of iron bars in contact (see image - onlye reprsent a piece of my model).
Be cause the diameter of the bar is so small (4mm) and there are so many small interactions, abqus need a very fine seed to generate the mesh. I´m using 15 as Aproximate Global size, 0.1* 15 as minimum, and 8 seeds per circle (mesh curvature control. If i enlarge this values abaqus wonté generate mesh.
I really need to genreate a more coarse mesh. Any ideas ? There are so many contacts to do partitions in every single one.
In ansys, the automatic mesh tools handle this problem very weel.





RE: Super Hard Mesh
How about using beam elements and then general contact? Should give a much more realistic stiffness response and a quicker calculation time.
If you really need solids then maybe altering the geometry by sweeping a square along the current geometry to make it rectangular. That would make the meshing easier. Beware of the stiffness when using coarse mesh. Abaqus defaults to reduced intregration elements (hex) which have bad bending stiffness.
RE: Super Hard Mesh
Thank u for your answer.
I am new using abaqus. This model is just to perform a thermal analysis, so mechanical characteristics are not important.
How can i use beam elements ? What are they ? i can´t find much information about them.
Thanks.
RE: Super Hard Mesh
RE: Super Hard Mesh
I do not know how beam elements work when it comes to thermal models (especially thermal expansion). It was just an idea.
Here is information about beam elements: http://50.16.225.63/v6.14/books/gsa/default.htm?startat=ch06.html
Here is how you create beam sections: http://50.16.225.63/texis/search/hilight2.html/+/usi/pt03ch12s13s04.html?CDB=v6.14
Basically, if I remember correctly, this is what you do:
1 Create a material property
2 Create a beam section (round, diameter = x), assign material for beams
3 Create a wire at the center of your geometry (could be wrong on this one)
4 Assign beam property to wire
5 Assign orientation (very important) (In part display options, or something like that, you can render beams which allows you to see if they are correct. If they do not render it is usually the orientation that hasnt been applied.)
If you can live with many small solid elements, just try the general contact instead of finding contact pairs. You might also want to try this if it is hard to mesh: http://50.16.225.63/texis/search/hilight2.html/+/usi/pt06ch69s06hlb04.html?CDB=v6.14
RE: Super Hard Mesh
Abaqus Analysis User's Guide, Section 2.2.3 - Defining reinforcement.