hyperelastic

Online finite element analysis of nanoindentation (indentation)

Dear All, 

 

We (the NanoBIO Node at Illinois ) have a preliminary release of an online finite element analysis of nanoindentation (indentation) tool using FEAP

This preliminary release is limited to linear elastic material, axisymmetric geometry, spherical rigid indenter, and various boundary conditions. 

We are currently working on adding viscoelasticity (Prony series), cylindrical and conical rigid indenters, and loading functions. 


Difference between different material models for Hyperelastic material

Hello,

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? 


Hyperelastic and Viscoelastic material modelling

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).

But can I use Mooney-Rivlin material constants, which we get from curve fitting the test data, to also model a  viscoelastic material which has large deformation and large strain (10-20%)?


azadpoor's picture

Call for special issue papers: Mechanics of cells, tissues, and biomaterials

The paramount role of mechanics in life has recently been the center of attention of many researchers. This special issue will be focusing on the role of mechanics in the life of cells and tissues and their interactions with biomaterials. Original research and review papers are solicited for review and publication in the journal Mechanical Sciences . Mechanical Sciences is an academic open-access journal sponsored by the Library of Delft University of Technology and The Netherlands Organization for Scientific Research (NWO). Thanks to the generous financial support of The Netherlands Organization for Scientific Research, all manuscripts will be processed and published free of any charge.


ADINA Support's picture

Virtual Heart Surgery

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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.

My problem is, even if you can get some function for E young's modulus for the linear elastic material, and this stress-strain curve can be fitted to Ogden stress-strain curve in order to get the same shape of curve.


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