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Dear all,

I have several questions about how to use existing constitutive law of material to code UMAT in Abaqus. I have carried out experiment for several powder materials, including metal, ceramic, polymer powders. The powder aggregate is compacted in a cylindrical die. After the compaction, relationships between axial stress and axial strain, radial stress and axial strain are obtained. The material under such condition is always treated as elastic plastic material.

Hi my friends,

in Mohr-coloumb plasticity model in abaqus program, there is hardening table,this table includes both cohesion yield stress and absolute plastic strain.

the question is this cohesion yield stress is calculated from the stress -strain diagram, or this cohesion is estimated from the shear test, you know when you draw a relationship between shear stress and normal stress you can get both cohesion and friction angle.

the second question is :- how can i see the model while it is running, i am using abaqus 6.6.

thanks alot.

Gamal

I'm trying to better understand the 3-noded triangular element with drilling rotations.

I think that the 3-noded triangle with drilling rotations is derived from the 6-noded linear strain triangle by, for mid-side nodes, constraining out-of-plane dof & converting in-plane dof to nodal rotation.

In particular, I'm wondering about the following:

Hi all,

 I need some help with MIMICS software please. I have a CT scan images for the whole body and i need to create 3D object for the shoulder model to each part Humerus and Scapula and then perform some measurments then Export it to ABAQUS. Does any one have any idea. Please help.

My email is: ninaall08@gmail.com

Thank you with my regards

Nina

Hello.all!

Is anyone doing the work on the modeling of  constitutive equation of Grey cast iron in large deformation?

Recently i read  Holm Altonbach's paper "on the Elastoplastic deformation of Grey cast iron" ,  i wonder how to convert the relation (stress-strain) into (stress-hardening parameter). I'm also not sure if the constitutive model can be used in large defomation simulation. 

 thanks in advance!

Y.T.

Hello everyone,

I'm working on a linking project between two software: Forge2008 and Abaqus.My goal is to transfert output datas ( nodes,elements, stress tensor) from one software  as input datas for the next one.

In order to realise this task I have to understand the output format .unv of Forge 2008  (Universal I-deas format) and convert this file to .inp ( Abaqus)

And use the subroutine Sigini in Abaqus to put initial conditions.

So to sum up  do you have informations about .unv file (description of elements)

Dear all,

I'm not an expert in using Abaqus. I need an example for modelling delamination with VCCT technique. My model always excited with errors and I dont understand the meaning of them. I posted a blog before, its still that problem. In Abaqus UsersManuel I do not find the right answers. Is it even possible to simulate delamination of a 3d-shell girder with VCCT?

Because VCCT is based on XFEM and I have read somewhere in the Manuel that XFEM is not for 3d-Shell elements. 

Thank you

Kind regards

Grischa

Hi everybody,I am a senior student in mechanics and I need an example of wave propagation in a thin plate to conduct my project. At now,my main problem is how to model it in Ansys or Abaqus.

Thanks in advance,

09132865471(mehran)

We are looking at implementing a non-linear model with friction, and at least in the first place for statics. We haven't found much in the literature on non-linear models for friction in FE.

 Anyone any advice on key papers to read ?

Thanks,

Chris

Hi all

I want to do a transient analysis in ANSYS or ABAQUS software.

 but the material has a frequency dependent damping. 

how can I simulate this property in FEM software?

Dear all,

I am considering using OpenSees software in plane strain SSI analysis
under cyclic loading. I have understood, roughly, how the structure of
the input file and the Tcl scripting language work. Nevertheless, I
would like to know; I understand that to model a rigid body, in
OpenSees, you can tie the horizontal and vertical displacements of the
nodes of the rigid entity. Is there any other way? Or did I
misunderstood?

Hi

I have some problems in using  heat effect and temprature gradiant in Sanders shell theory

I will be very appreciated if anyone can help me

thanks a lot 

Hi Every body,

I know that the crack propagation energy release rate G is by defination the release of elastic energy and potential energy of loads per unit area of crack extension and for a linear body loaded by a single load P is given by :

G=P^2/(2b)*dc/da

Any body know if instead of load P, moment M is being used what would be formulation?

I really need this one

Thank you,

Parisa