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Tangent modulus of the Mooney-Rivlin based Neo-hookean - Could you check my derivation??



I study solid mechanics at a graduate school.


I tried to derive tangent modulus of the Mooney-Rivlin based Neo-Hookean material.


There might be no error in my derivation, but answer is wrong with referred right answer.


So, could you check my derivation?


I attached my derivation as a figure.




Thanks in advance.

Hyperelastic compressible experiment

Dear All,


I got confused on the hyperelastic experiment that the uniaxial, equibiaxial, and planar test are based on the material is incompressible. What if the material is compressible, are the experiment the same as incompressible material? Except for the volumetric mode, what is the different between incompressible and compressible material experiment? Thanks!






Attila Kossa's picture

Introduction of the hyperfoam model in ABAQUS

Dear Researchers,


I am trying to find out which was the first ABAQUS version, wchich includes the hyperfoam material model. I haven't found any version history about this. Could someone tell me the very first version of ABAQUS in which the hyperfoam model was included?


Thank You!

Kind Regards,

Attila KOSSA

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I am doing a project on rubber couplings and it is a bit difficult for me to decide between the material models availavle in Ansys 14. I am new to this field and want some assistance in choosing the material model. So, can anyone help me to theoroticall explain the difference between the different material models available in Ansys? 

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I have a doubt regarding the Hyperelastic and Viscoelastic material modelling in ANSYS using Mooney-Rivlin material constants.

ANSYS theory manual says that for large deformation and large strains, the material modelling (i.e. constitutive behaviour) is same for hyperelastic and viscoelastic. Is it so?

Generally,  Mooney-Rivlin material constants are used to model Hyperelastic behaviour (rubber-like materials).

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WhatDifference:same stress-strain curve for linear elastic material with nonlinear young's modulus and hyperelastic material

Hi everyone,

Now I am trying to implement Ogden model in Comsol Multiphysics, but I had some problem.

Then I realized that in Comsol, it's possible to implement a nonlinear young's modulus.

But I am a little confused.

If you have a nonlinear Young's modulus, in the stress-strain curve, E is the tangent of this curve.

For hyperelastic material, let's say Ogden material. It's usually a nonlinear stress-strain curve as well.

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