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plane stress incompressible neo-Hookean hyperelasticity


I was wondering how is it possible to implement incompressible neohookean material in abaqus? 

With the incompressibility assumption c(3,3)=1/(- c(1,2)^2 + c11*c22), with c being the Cauchy-Green strain tensor. It also implies that S33=0 and it is possible to find the pressure directly. In addition, h=sqrt(c(3,3))*h0 with h and h0 being current and initial thickness, respectively. 

my question is that how is it possible to implement the last condition in umat? 







Frank Richter's picture


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For an intro to subroutines get the file User Subroutines with ABAQUS.pdf




and contact me privately to get a file
"A large deformation Neo–Hookean user material in ANSYS.pdf",
listing a code. I cannot find the button to upload it.






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