Hi everyone, I have a question about C3D4H element in abaqus.

The C3D4H element is a 4-node hybrid('mixed') element. The element has a linear displacement and hydrostatic pressure behavior. There are 4 degrees of freedom at each node: 3 translations and 1 hydrostatic pressure, so this element uses both displacement and hydrostatic pressure as primary unknown variables, and the pressure can't be condensed on element level.

The final stiffness matrix has the format of​​​​​​​:

I want to know how to output the value of hydrostatic pressure at each node, and what's the meaning of pressure at integration point now, thanks!