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Abaqus User element UEL

Issues with the implementation of Strain gradient plasticity framework of Niordson and Hutchinson (2003) in ABAQUS UEL

Submitted by Suman.Guha on
research
strain gradient plasticity
Abaqus User element UEL

I have implemented the rate-independent strain gradient plasticity framework of Niordson and Hutchinson (2003) in UEL. I was able to validate the results of the shear of infinitely wide thin layer between two rigid surfaces (Niordson and Hutchinson, 2003). However, the UEL subroutine fails to converge for the more complex problem of the shear of finite width slab. I suspect the convergence issues are arising out of internal elastic-plastic boundary conditions and the yield criteria. I have few doubts in this regard.

 

1073741819 error code in ABAQUS

Submitted by ashkan khalili on
Abaqus User element UEL
ABAQUS
user subroutines
Abaqus error

Dear all,

I'm using UEL in ABAQUS. The UEL works perfectly as far as I have 256 time increments (each 1e-6 sec). When I'm trying to increase the time increments (let's say 512 with the same 1e-6 sec per increment) Abaqus gives me error code 1073741819.

I'm running Abaqus 6.14.2 with Intel Fortran Composer XE 2013 on a Windows 7. CPUs are 3rd generation.

I would appreciate if you could help me to figure it out.

Best Regards,

Abaqus UEL for coupled diffusion-deformation theory for elastomeric gels

Submitted by shawnchester on
Abaqus User element UEL

We have a new paper in IJSS that discusses details about Abaqus user elements, in the context of polymer gels, that may be useful to the community. The supplemental material of the paper provides the UEL code, some input files, as well as a short tutorial that should be helpful to others in their own research projects, even if not related to gels.

The link to the files is: http://web.njit.edu/~sac3/Software.html

One time calculation in UEL

Submitted by ashkan khalili on
Abaqus User element UEL

Dear All,

I'm a new UEL user. In my UEL I have a big Matrix which eigenvalues and eigenvectors of these matric is needed. the matrix is not changing during the time and it has constant elements. As you may know, calculating eigenvalues and eigenvectors is a time consuming procedure. In every time incerement, ABAQUS calculating eigenvalues and eigenvectors with bunch of other things in UEL.

Calling a File inside of the UEL

Submitted by ashkan khalili on
ABAQUS
User subroutines in ABAQUS
Abaqus User element UEL
UEL

Hi everybody,

I'm writing a User Difined Element (UEL) for my research.

Would you please let me know if it's possible to call a file (txt, dat, etc) inside of the UEL or not?

Example:

    IF (LFLAGS(3)=1) THEN

        OPEN (UNIT = 10, FILE = "AAA.dat", STATUS = "OLD")

        READ (10, *), StiffnessTable

        AMATRX=StiffnessTable

    END IF

Thanks in advance,

User subroutine in fortran 90 for abaqus

Submitted by BrianBak on
Forums
Computational Mechanics Forum
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fortran 90
Abaqus User element UEL
abaqus 6.10
f90
user subroutines

Hi Abaqus experts



I am hoping that you can help me getting a element user subroutine writen in fortran f90 to work in Abaqus. I have made the simplest 8 noded brick element element that i can think of. I has a zero thickness and only has some simple definitions of the parameters ESTIFF,RHS,SVARS and PNEWDT. I have made a model with one single element of this user element where the upper part is displaced from the lower part which are fixed.



When I try to run the model I get the following message in the log file:



User Element for muscle model, with static condensation

Submitted by YKajee on
research
Abaqus User element UEL

Hi all

 

I am in the process of developing my first user element in Abaqus, and finding it rather difficult. 

The
application requires modelling muscle behaviour. Hence a spring model
(linear at this stage) with 3 elements: 2 in series with each other,
and these 2, parallel to the third was implemented.

My problem involves static condensation of the stiffness matrix. (similar to mixed-methods)

Any advice/assistance would be great. Especially with regard to development of the user element in Abaqus.

 

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