Eliminating Elements in Commercial FEA Solvers

[pukb]

I want to why actually elements are eliminated in commercial fea solvers.
There is a criterion like stress or strain at which elements having acheived that state are eliminated.
Wouldnt it lead to wrong results because, the material at eliminated elements place has become null.

 

[AlephZero]

What type of analysis are you talking about here?

"Eliminating elements" could mean different things in different contexts.

 

[pukb]

I was trying to understand ball impact on a steel plate. So we can take it as explicit, impact analysis.
I am talking about elimination of elements of plate on impact of the ball.

 

[Mech_Engineer]

The only context I can think of where elements are "eliminated" in an explicit FEA solve would be in an explosion or destructive impact event where material is being destroyed.

 

[AlephZero]

The only context I can think of where elements are "eliminated" in an explicit FEA solve would be in an explosion or destructive impact event where material is being destroyed.

"Destroyed" isn't quite the right word, but if the material in an element is deformed or damaged so much that it can no longer transmit any loads (e.g. the compressive stress exceeds the crushing strength of the material) deleting the element from the model is a simple way to represent that behaviour.

 

[Mech_Engineer]

As you said AlephZero, it all depends on what he means by "eliminating elements."