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plane stress incompressible neo-Hookean hyperelasticity

Hello, 

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? 

 

 

 

 

 

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Frank Richter's picture

 

Subscribe to and seek assistance from the
ABAQUS mailing list
https://groups.yahoo.com/group/ABAQUS

Search the archive before posting.

For an intro to subroutines get the file
http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf

 

also:

https://www.researchgate.net/post/Spatial_Tangent_Modulus-UMAT_for_near_...

 

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.

 

Frank

 

 

 

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