Biphasic model in static analysis

[Hassan]

Hi everybody,

I want to model cartilage under load in static analysis. Does biphasic effects show themselves in static analysis or it is good enough to use incompressible material for cartilage, given that the solid and liquid parts of the cartilage are considered incompressible and the fluid does not have a chance to move in static analysis (I assume)?
Thank you for your help.

Best regards,
Hassan

[maas]

Hi Hassan,

In a static analysis, there are no inertial effects, but that does not mean the fluid can't move in or out of the biphasic material. That depends on how fast your loading is. If the time-scale you are interested in is relatively small so that indeed the fluid doesn't have time to move, then you may indeed model a biphasic material as an incompressible material. There is relevant paper on this subject that you may find interesting: https://doi.org/10.1115/1.2720918

Best,

Steve