deal with strain gradient by abaqus

 dear everyone,

I want to ask if anyone deal with strain gradient proposed

by fleck eat. in 1994 and 1997, using subroutine in ABAQUS ?

I have read the manul of abaqus for a couple of days.Here

is my problem. It does not provide extra freedom for user

except 12 freedom booked in the abaqus,such as 1 ,2 

representing x-displacement and y-displacement,

is that ringht ?  if I use the rotation freedom ,

it need extra force such as blending ,if not ,the stiff matrix

will not be symmetrical. when I put strain gradient into SVARS

options ,strain gradient will not be coupled into control

equation which means it will not be coupled into Virtual

power ? I do not know is that any way to solve the problem . 

can you fix a way for me ?

gary