Hello everyone,
The strain energy of Abaqus neo-Hookean material is:
U = C10 * ( Ibar1 - 3 ) + ( 1 / D1 ) * ( Jel - 1 ) ^ 2
If D1 = 0, then stress values will become infinite. But, there are examples in Abaqus Documentation that D1 is assumed to be zero.
What happens when D1 is set to be zero in Abaqus neo-Hookean material?
Does it change the strain energy function to avoid infinite stress?
What does it mean when D1 is zero?
Hi, Saeed Torbati
From Abaqus 6.13 Theory Guide, 4.6.1 Hyperelastic material behavior:
"The Di values determine the compressibility of the material: if all the Di are zero, the material is taken as fully incompressible. If D1=0, all Di must be zero."
From Abaqus 6.13 Analysis User's Guide , 22.5.1 Hyperelastic behavior of rubberlike materials:
"If D1 is equal to zero, all of the Di must be equal to zero. In such a case the material is assumed to be fully incompressible in Abaqus/Standard, while Abaqus/Explicit will assume compressible behavior with Poisson's ratio of 0.475."
For incompressible neo-Hookean material in Abaqus/Standard
U = C10 ( I1 - 3 ).
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