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hyperelasticity

How to get the update the local material coordinate in large deformation for hyperelasitc rubber-like materials?

Submitted by Jiang Chen on
education
hyperelasticity
large deformation
material coordiante
anisotropic hyperelasitc

Hello, 

I want to ask things about the updation of local material coordinate in large deformation. 

Does there exist two ways for this?

1. Polar decomposition of Gradient Deformation Tensor F to get the rotation tensor.

2. Update each basis vector of local material coordinate system using modified Gradient Deformation Tensor F_bar = F*J^(-1/3).

What I cared about is the second method, is the second method available?

Wish someone could help me, : ). Thanks!! 

Required - Verification test for Incompressible hyperelastic models

Submitted by Ashesh Sharma on
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hyperelasticity
finite elements
incompressible

Hi,



I am working with a finite element code implemented in C++ in my research group. Recentl I implemneted an incompressible finite strain element.

 Currently I am making use of verification tests to check whether my element runs accurately for various hyperelastic strain-energy models. I have succesfully completed a verification test using the Mooney-rivlin strain-energy density function. However, I have been unable to find verification/benchmark tests which I may use to test other strain-energy density functions.

Anisotropic plasticity and hyperelasticity in Abaqus

Submitted by Richard.Pauck on
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ABAQUS
hyperelasticity
anisotropic plasticity

I am trying to model a polymer that has been processed in such a way that it has oriented (orthotropic) material properties and undergoes very high strains (>100%) before break.

3rd International Conference on Material Modelling incorporating the 13th European Mechanics of Materials Conference

Submitted by mmazdz on
conference
nanomechanics
hyperelasticity
atomistic simulations
modelling

Dear Colleagues,

During the last decades material modelling has become a field of central

scientific importance. Although there exist many workshops, meetings,

colloquia, etc. on specific materials, and particular applications, here a

single conference dedicated to material modelling with all its various

facets is intended. To this end, the aim of the ICMM conference is to bring

together researchers from the various fields of material modelling and

materials characterization. The intention here is to cover essentially all

Constitutive models for rubber

Submitted by Italo Persechino on
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hyperelasticity
Constitutive modelling
rubber
stretch ratio

Hi.

I found a very useful explanation about hyperelasticity here: http://en.wikipedia.org/wiki/Hyperelastic_material#cite_note-Ogden-1

 In the proof3, there is a good explanation (I can't found anything better than this one) of how we can express the Cauchy stresses in terms of the principal streches.

I am interested to incompressible material, so this is the equation:

 

Jacobian matrix of Mooney-Rivlin model

Submitted by augustus on
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Nonlinear elasticity

Hi,

does anyone know where I can find the analytical expressions for the components

of the Jacobian matrix of the Mooney-Rivlin model.

I know the compact form of the matrix, with the tensor products, deviators etc,

but I'm looking for the explicit expressions of each component of the matrix.

 

many thanks!

 

 

 

anisotropic hyperelastic ansys subroutine

Submitted by adrianall on
research
hyperelasticity
anisotropic

Recently i work on finite element model of a human vertebral body, and focus on intervertebral disc.

Based on its structure which consist of collagen fibers i have to use anisotropic hyperelastic model with reinforced fiber, and i derived the coefficients of strain energy function.

but i have some troubles to modeling this material in ansys v.10 or v.12, because i have to use user material subroutine and i have not enough information about how to define material with macro in ansys

Hyperelastic material characterization: why they call it the pure shear specimen

Submitted by wvmars on
education
hyperelasticity
elastomer
constitutive modeling
characterization
pure shear

Many people puzzle over the nomenclature of the pure shear test. They rightly point out that 1) the Pure Shear test piece is loaded in tension by extending the specimen in the axial direction, and 2) a shearing deformation, by definition, involves the lateral motion of parallel planes. They wonder where is the "shear"? and what does it mean to say that the shear is "pure"?  Here, we review the origins of the terminology. 

hyperelastic or elastic skin model in Abaqus

Submitted by Izabela on
research
biomechanics
materials modeling
hyperelasticity

Dears,  I am quite new in the area of Abaqus models and biomechanics. My background is related with textiles. However I am a post doc in Belgium at the moment and my new task is to model a fingertip skin section under the influence of contact with different objects.

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