volume change in quad elements

[Rubinsa]

Hi all,

In a 2d element test with a quad element, does the quad elemnts have constant value behavior? Is there a way to not behave like that?

[mhscott]

Your question is unclear. Are you using plane strain or plane stress?

[Rubinsa]

Thank you for your response.

I am using plain strain and PDMY02 constitutive model.

When I compress a single element horizontally, the horizontal and vertical strain values are exactly the same values (one is negative and the other is positive). It is like the element is in constant volume condition. I would like to know why it behaves in this manner and if there is a way to stop it?