Learning Forum

[Andreyteston]

Hello, members.

I am modeling a circular concrete-filled steel tube. Based on this topic, I have read this sentence: "The mesh has only one element through the thickness of the steel. At least four elements are required."

Thus, I have applied four or more elements through the thickness, and I have received this warning: "Shape testing revealed that 640 of the 640 new or modified elements violate shape warning limits.  To review test results, please see the output file or issue the CHECK command."

Based on this, I have tried:

1) I have changed the element from SOLID185 to SOLID186;

2) I have changed the element from SOLID186  to SOLSH190;

3) I have read posts to change the geometry of the element, from rectangular to square. However, changing this way I will increase significantly the number of elements because I would like to maintain coincidence elements in the faces between the steel tube and the concrete. 

4) Does any member have advice if I increase the number of elements in this region, I should solve this problem? If the answer is yes, I should make this only creating new segments of the semi-circle in this region and generating new elements, or have different ways to make this using Mechanical APDL?

5) Does any member have one advise that be different of increase the elements?

I would like it if any member could help me.

Regards.

 

[peteroznewman]

Option 6 is to ignore the warning.

You don't show how long the element in the steel pipe is. What is the aspect ratio? Maybe the solution results don't have a large gradient along the axis of the column. If they do, then you should increase the number of elements along the length.

[Andreyteston]

Hello, Peter. Thank you for your answer.

I was erringly worried about the ratio between the length of the circumference and the thickness, in this picture, for example, the length of the circumference has 5.60 mm while the thickness has 0.75 mm.

However, you are right about the elements along the length, I have been increasing the number of elements in this direction and the shape testing are approved.

Best Regards.