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What is incompressible solid?

Submitted by Breslavsky on
research
poisson's ratio
incompressible elasticity
strain invariant

Dear Colleagues,

 

In the literature two definitions of incompressible solid can be found. The first one is: Poisson's ratio =0.5, and the second is: the  third invariant of the Cauchy-Green deformation tensor J=1. I wish to understand the connections between these two definitions. To me, here is something strange.  Poisson's ratio relates strains to stresses,and J as the combination of strain tensor components, doesn't depend on Poisson's ratio. I'll be grateful to you, if you explain me how these two definitions are connected.

Enhanced thermal characterization of silica aerogels through molecular dynamics simulation

Submitted by Jingjie Yeo on
research
molecular dynamics
silica
Simulation of nanoporous material
phonon
Molecular Dynamics (MD)
Silica aerogel
Thermal conductivity
phonon density of states

http://iopscience.iop.org/0965-0393/21/7/075004/ 

 

megagrants in russia! who whould join me in preparing one application?

Submitted by Mike Ciavarella on
research
megagrants

Dear colleagues!

The Ministry of Education and Science of the Russian Federation has opened a call forapplications for the Russian Federation Government support of scientific research, carried outunder the supervision of leading researchers in Russian higher education institutions, research organizations of state academies of sciences and state research centers of the Russian Federation.

Underlying Material Response for Lüders-Like Instabilities

Submitted by Julian Hallai on
research
ABAQUS
steel
Shape Memory Alloys
finite elements
SMA
localization
Lüders Bands
Propagating Instabilities
Material instabilities

► The underlying material response of partially unstable materials is measured. ► This is done for Lüders deformed steel and a shape memory alloy. ► They both exhibit an up-down-up response. ► The extracted responses used in numerical models reproduce the structural responses.

[Abaqus] How to assign surface properties to all elements?

Submitted by cooljoon78 on
Forums
Fracture Mechanics Forum
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research

Dear All,

Anyone know how to assign surface contact properties to all elements in Abaqus?

i.e. all elements have contact (cohesive) properties on each boudary, so a crack propagates following those boundaries without defining pre-known crack path.

Does Abaqus support those automatic insertion fuction since manually inserting properties to all elementary boundaries is non sense...

Thank you in advance,

Joon

where to find the datum of plastic-damage model of concrete??

Submitted by Jing_Yang on
research
concrete plastic-damage model abaqus

Dear all,

Where can we find the datum of plastc and damage evolution in uniaxial case for concrete of some specfic strength? It seems that datum associated with plasticity or damage can not be found in concrete code. But when you use the damaged plasticity model integrated in ABAQUS, these datum are indispensible.

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