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UMAT non-associated Drucker Prager

Hello,

 

I am looking for a UMAT or some sort of reliable piece of code to implement the non-associated Drucker-Prager plasticity. I appreciate your help.

 

Setareh

Perfectly matched layers

Hello,

 

I am looking for a practical reference/example on how to implement the perfectly matched layers for mechanical problems in a Finite Element code. I want to model a plate where it is surrounded by the PML from all sides, like a piece of earth crust surrounded by the land. The sources which I see for PML, are mostly in the area of electromagnetics.

 

Your inputs are appreciated.

Setareh

Drucker Prager Plasticity model

Hi All,

I am trying to code the Drucker prager plasticity model for the 2D plane strain case using consistent tangent modulus. I am using C++, therefore I would appreciate if anyone could share relevant materials which I could use and preferrably for the 2D case so it is not unnecessarily complicated.

 

Drucker Prager Plasticity model

Hi All,

I am trying to code the Drucker prager plasticity model for the 2D plane strain case using consistent tangent modulus. I am using C++, therefore I would appreciate if anyone could share relevant materials which I could use and preferrably for the 2D case so it is not unnecessarily complicated.

 

Mohr Coulomb plasticity model

Hello everyone,

 

I am trying to implement a Mohr Coulomb plasticity model(no hardening at the moment) for the plane strain case. However, the results are not making so much sense.

I was wondering if any of you have tried to code this material model successfully before, or if you could provide me with some algorithm or reference which you know works properly.

 

Thank you.

Setareh

Single Element Test(boundary conditions)

Dear All,

 

I want to do some single element tests for a plane stress quadratic element with bi-linear shape functions(like the plane 42 element in ANSYS).

 

What I am not sure about is what boundary conditions should be applied to the single element in this case. I also want to apply a prescribed displacement as the loading. (I would like to first try to do these single element simulations in Ansys and then with my own developed codes, hopefully the results will conform, as sort of a basic validation of my own developed code)

 

Career perspectives in the field of "porous media"

Hi everyone,

 

 I was wondering what the career opportunities would look like after getting a PhD in numerical simulation of porous media. Besides a research job in universities, what other possibilities are there? Would industry also be interested in such specialization and if yes in which sectors?

 

Thank you for your opinions.

Setareh

Career perspectives in the field of "porous media"

Hi everyone,

 

I was wondering what the career opportunities would look like after getting a PhD in numerical simulation of porous media. Besides a research job in universities, what other possibilities are there? Would industry also be interested in such specialization and if yes in which sectors?

 

Thank you for your opinions.

Setareh

3D FEA of stress concentration

Dear all,

 

I am simulating tensile specimens with an elliptical pore(representing a flaw in the material) in the mid-cross section of the specimen. What I am looking for is the stress concentration caused by this pore.

I am simulating this as a 3D specimen under tensile loading only, with 3D, 8-node linear brick elements(1st order). Now my questions are:

1- Is there any analytical solution for such problems(3D with elliptical pore) with which I can compare my FEA results?

Creating a path in python for Abaqus

Dear all,

I want to write a python script for ABAQUS in which I can define a path for post-processing purposes. Getting the nodes which lie on the path is easy because they all lie on one edge, so with

myNodes=myEdge.getNodes()

I get the list of nodes.

 

Now the problem:

Converged, but to the right solution??

Hello eveybody,

I am confused in using numerical schemes: What can convergence of a numerical scheme tell us and what not??? lets assume that a numerical scheme does converge to "A result" or "A number", but how could we be sure that the scheme has actually converged to the "RIGHT solution" and not a WRONG one??

Any input is appreciated!

Setareh

Converged, but to the right solution??

Hello eveybody,

I am confused in using numerical schemes: What can convergence of a numerical scheme tell us and what not??? lets assume that a numerical scheme does converge to "A result" or "A number", but how could we be sure that the scheme has actually converged to the "RIGHT solution" and not a WRONG one??

Any input is appreciated!

Setareh

Stress intensity factor vs stress concentration factor

Hello everyone,

Can someone please explain the difference of these two?

Thanx

Setareh 

 

 

Discontinuous Galerkin FEM

Can some of you recommend a source to learn about Discontinuous Galerkin FEM?? I am specifically interested in its application in geomechanics but I need to learn the basics first!

Industry-level journal about FEM applications

Hi dear mechanicians,

I am about to publish the results of my MSc thesis in a journal. The thing is, my project was carried out in industry about multi-scale FE simulation of impact in composites. So it is merely an industry-level application of available methods.

 I want to ask if any of you have any particular journal in mind, in which publishing such a paper is rather easy (doable) and does not have a long waiting list for review??

Looking forward to your suggestions

Thanx a lot

Setareh

impact damage due to laminar construction??

Hi everyone,

 

According to a book chapter written by NL Hancox, 'Laminar construction of composites which is required if the reinforcing fibres are to be used efficiently and anisotropy reduced, can be a reason why composite laminates are vulnerable to impact damage.'

Now I have three questions;

1-What is meant here by the specified 'laminar construction to reduce anisotropy'?Does it mean to use different orientation for fibres in each ply to have an isotropic material at the laminate level?

mesh dependence of continuum damage mechanics approach

Hello Everyone,

I am a beginner in FEA of composites under impact in commercial explicit code Pam Crash.I want to know why the behaviour of composite plies with CDM approach show mesh dependency?Or a more general question for me is that what makes the FE simulation of a material with strain softening behavior mesh dependence(If this conclusion is right)? Does it make any difference with regard to mesh dependency if one uses implicit codes??

Thanks

Setareh 

 

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