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Recommend me some UMAT references for cardiac mechanical modelling

Submitted by Jason Liu on

Hi, everyone!

Now I am starting the research on cardiac mechanical modelling. The user defined function "UMAT" was used to implement  the anisotropic hyperelastic Fung-type model . Now I come across some difficulties to write UMAT subroutine. Can someone recommend me some useful codes that can let me know how to write it.

Postdoctoral Positions at Univ. of Texas at Austin, Petroleum & Geosystems Engineering

Submitted by Jinie2000 on

Dr. Mukul Sharma, Professor in Dept. of Petroleum and Geosystems Engineering at the University of Texas at Austin is seeking to fill two Postdoctoral Positions.

Post-doctoral Research Position at MIT: Development of Finite Element Methods for Nano-scale Structures

Submitted by Bathe on

A post-doctoral research position is available in my MIT research group for the Development of Finite Element Methods for

Nano-scale Structures. Experience in nonlinear finite element analysis and, ideally also, the analysis of multiphysics problems

is needed. Please contact me if you are interested,  Prof. KJ Bathe, kjb [at] mit.edu.

Truncation of Displacement boundary conditions in Abaqus

Submitted by lorenzoguiducci on

 

 

Hi everyone,

 

I've wrote a script in python to create a model in Abaqus, run the simulations and retrieve the results I need.

I use the Abaqus python build (on PDE).

 

I experience a strange problem with the following command:

 

myModel.DisplacementBC(... ..., u1=0.123456789, u2=SET; ur3=...)

 

which gets translated in the input file like this:

 

*Boundary

myNodeset, 1, 1, 0.1234

myNodeset, 2, 2

 

Cylinder inflation using Abaqus

Submitted by manz_0 on

Hi All,

 I am trying to model the inflation of an enclosed elastic cylinder. The only example I have came close to in the Abaqus support documentation is the air bag inflation test. However, even reading the documentation, I am still unsure on how to model the airbag before an inflation force is applied. Can someone help me with this? You can also e-mail directly: manpreet.puri [at] strath.ac.uk.

link abaqus 6.10 and intel fortran 11 to use subroutines

Submitted by eddie on

Hi everyone

 I did so much efforts but  I could not reach a successful link

between abaqus 6.10 and Intel fortran 11 and in abaqus verification it didn't

pass.  Is there any obvious way to solve this problem? I have not find any

suitable solution in the internet :(

 

Regards,

Eddie

Damping when using UMAT in Abaqus

Submitted by lizheng619 on

As it is known, when using UMAT abaqus, stiffness proportional damping can not be used. However, for the dynamic calculation it is neccessary to put some stiffness damping. So for approximate calculations, it is easy to use numerical damping instead.

 *Dynamic, application=XXX,

and using the key words *Dynamic, XXX, users can adjust the value for numerical damping. Althogh, there is no physical meaning for numerical damping, it can be a temperory solution for UMAT dynamic calculation.