Nonlocal Damage implementation using ABAQUS UEL

Hi everyone,

In order to simulate nonlocal damage in trabecular bone structures in
ABAQUS, I need to implement the constitutive laws into the user element
subroutine (UEL), since it is not possible to implement nonlocal FE in
UMAT, as far as I know!

I would be very much grateful if someone, who has experience in this
regard, esp how to implement 3D elements, e.g. C3D8, into a UEL code,
shares some knowledge.

Best,

Hadi