febiosoftware / FEBio

FEBio Suite Solver
https://febio.org/
MIT License
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Representing growth using the prestrain gradient? #55

Closed asrvsn closed 1 year ago

asrvsn commented 1 year ago

Hi,

From the docs it appears to me that the prestrain gradient (for incompressible materials) should have determinant 1. Is this correct?

When this is not the case, I frequently encounter negative Jacobian. I'm trying to represent a time-dependent growth process in an incompressible material. Is this possible to do via the prestrain gradient with determinant < 1?