Biphasic material in Abaqus Explicit

[VMSam]

My goal is to use a biphasic poroviscoleastic material model for cartilage. But the C3D8P element type is only accessible via the implicit analysis. If I were to use VUMAT to code the biphasic behavior, the fluid pressure term won't be provided or accessible like it is in UMAT.
So my question is: Is there a way to use a biphasic element in Abaqus Explicit and access the fluid pressure term via VUMAT?
Any thoughts on why this element type is not accessible in the explicit and what to do instead would be appreciated!

 

[FEA way]

In addition to VUMAT, you could write VUEL to create your own element with pore pressure DOF.

Just in case you haven't heard about it - there's an open-source FEA software called FEBio. It's meant for biomechanical applications and supports biphasic materials. Perhaps it could be useful for you.

 

[VMSam]

Just in case you haven't heard about it - there's an open-source FEA software called FEBio. It's meant for biomechanical applications and supports biphasic materials. Perhaps it could be useful for you.

Thanks for the suggestion. I have looked into using FEBio, it has a very good and straightforward way of implementing biphasic materials. But our model is developed in Abaqus and it has too many pieces for us to be able to port it at this point.

In addition to VUMAT, you could write VUEL to create your own element with pore pressure DOF.

Do you think defining an element in VUEL would solve the problem, or are there any other conditions that I should also meet for being able to do a Biphasic analysis in explicit? The fact that Simulia excluded the elements with a pore pressure term from explicit makes me wonder if there is a fundamental/mathematical/mechanical reason for not doing a biphasic analysis in explicit!