Does anyone know how to define a J-R curve in abaqus for a ductile analysis? JR=JIC+C(delt a)^m. We know JIC, C and m, but dont know how to define them in Abaqus.

Thanks

hi all

i have a problem about abaqus a want to rotate a sheet and form it with a roller it sod rotate about axial but wen i want to rotate it hade a problem about ignored BC that rotated the sheet. i define Bc for to nod in sheet center and velocity rotation to all of sheet . 

plz help me to solve this problem

Hi all,

I'm using Code-Aster (FE solver) and I need to implement a UMAT subrouting to model a non-linear viscoelastic model in it.

The model is combination of viscoelasticity+ Ogden hyperleastic model. I was thinking of 2 approaches:

1. I wonder do you know where I can find such a subroutine?

2. I've seen linear viscoelastic subroutine and maybe I can find another subroutine for hyperlelastic part, I wonder how can I combine this two models to a non-linear viscoelastic model? 

I really appreciate your help

BME 

it's a basic problem. In LS-DYNA, with explicit or implicit method, one material model is only suitable for some element formulations/types, but not for all element types. There must be many deep reasons and some aspects to be considered.

why element formulation can not independent on material model?

could you tell me some detailed deep reasons or links about this? thanks!

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.

I have problem with linking the visual studio, fortran and ABAQUS. Is there anybody who can help me?

Hello every one.

I need your help. I am now learning ABAQUS, doing some practice with crack propagation. The example I am doing now is a gravity dam. I sincerely want to know some material parameters with concrete damage, for example, the Normal Mode Fracture Energy, Shear Mode Fracture Energy 1st direction and 2nd direction, etc. If anyone could provide them to me ,or recommand some books that share such parameters, I would be much appreaciated.

I am waiting for your help.

Thanks.

We are excited to announce the arrival of version 1.5 of FEBio (Finite Elements for Biomechanics). This new version can be downloaded at http://mrl.sci.utah.edu/software/febio. FEBio is an open-source finite element package, specifically designed for solving problems in the field of computational biomechanics. This new version includes some major changes and contains a number of new and exciting features. Some of the noteworthy changes and additions are listed below.

I have put a history output request of displacement of a set of nodes in my model but the history output request doesnt how up in the results tree. Please  help.

Thanks in advance ,

Saurabh

i am working to thermal ratchetting preaaure vesseles and pipes
and I'm doing with the software abaqus(combined hardening model)
but i have problem:
i use 2 step in abaqus
1-general-static for pressure

You can enrich your online articles by providing supplementary MATLAB figure files with the .FIG file extension. These files will be visualized using an interactive viewer that allows readers to explore your figures within the context of the article. The FIG files can be uploaded in our online submission system, and will also be available for downloading from your online article on SciVerse ScienceDirect.

For more information, go to http://www.journals.elsevier.com/journal-of-the-mechanical-behavior-of-biomedical-materials/journal-news/option-of-including-matlab-fig-files-now-available/

Dear colleagues,

 I am a beginner in using ABAQUS subroutines, and currently come into the problem of running ABAQUS subroutines written in Fortran.

I have installed ABAQUS 6.11-1, Microsoft Visual Studio 2010, and Intel Visual Fortran Studio XE 2011 on my computer. However, when I run the test codes, there are the following errors:

Hi all,

 I modelled a pile in sandy soil, the pile is subjected to a lateral load. I embedded the pile inside the soil. The soil if always over stiffened , can any one tell me why , why the soil is very very stiff, I used very small value for elasticity modulus. please help

When I analyze a quiet complex spatial structure, error information warn that: the direction of the beam element is
not correct.

From abaqus document 26.3.4 I know we can
nominate the direction of beam element by adding additional node.It is clear
that this node should be off the axis of the element,any additional constrians?

Dear Friends,

 I am going to simulate a wavy orthotropic fiber in an isotropic media with  ansys workbench. The fiber is solid and the material direction of fiber needs to be changed continously with the fiber direction. I attached the model. I will appreciate if any body can give me an idea?

 Kind Regards,

Saeed

Hi all,

I am making a little plugin for Abaqus but I am stuck. Can someone help me?

My plugin populates an AFXTable with some ID and Name, the user selects one of those rows and when he/she hits Ok, the Kernel script should receive the row that the user selected.

None of this is working!

I can populate the table, but when I select a row the kernel script receives an empty keyword! I can only fix that if I modify the text of a cell.

Even when I do that I get unexpected results.  This is the code:

from abaqusGui import *

from pysimplesoap.client import SoapClient

class CADECLaminateDB(AFXDataDialog):

Dear colleagues,

is there any technique to reduce a computational time in Abaqus/Standard like it can be done in Abaqus/Explicit using an increase of the loading rates and performing mass scaling???

Thank you in advance!

Best regards,

mlx22 

Good day to everyone....

Im new in the abaqus user... im here got some problem in my beginner stage:

 (i) what the units used in the abaqus? how can i ckeck it? 

(ii) what is means of the approximate size?

(iii) we can put the vertical load and horizontal load, but how i can put the load with the angle such as (10kN in 30o) 

(iv) how can i do if i want do the looping in my analysis, such as:

      after the intial boundary condtion stage, im obtain the stress and
strain result then i want continue my analysis until the final result
with equilibirum strain...    

      example:

Good day to everyone....

Im new in the abaqus user... im here got some problem in my beginner stage:

 (i) what the units used in the abaqus? how can i ckeck it? 

(ii) what is means of the approximate size?

(iii) we can put the vertical load and horizontal load, but how i can put the load with the angle such as (10kN in 30o) 

(iv) how can i do if i want do the looping in my analysis, such as:

      after the intial boundary condtion stage, im obtain the stress and strain result then i want continue my analysis until the final result with equilibirum strain...    

      example:

Hi

I want to modeling fatigue in composite with abaqus and i need a simple example in this subject.

can i help me?

tnx

hi , i wanna define a four-bar mechanism with matlab and optimal input that none of branch,circuit and order defect happen in my program . can someone help me how can i apply this conditions in my program???

I hava a problem regarding to solve the analysis of plates with transverse  loading with help of ANSYS.

plz help me how can i proceed becoz it's results are not maching with theoritically as given analysis methods  in " theory of plates" by s. chandrashekhra.

Dear all

I would like to model two non-linear material as shown in the pictures in ABAQUS. But I can model it with its non-linearities. The model has been created with beam element. I used the classical elastic-plastic model using calibrations but because of elastic non-linearities the calculated plastic strain comes negative. please help me howI can model it

regards

Hi,

What is the difference between the nodal force (NFORC) and Reaction force in abaqus. I applied some displacement in my model, when checking the Reaction and Nodal force at the same node, Nodal force is just half the reaction force. Then I did some experiment and applied some load on a node, after solution when i check the nodal force on the same node, it is half of the applied load. Why is it not  same as the load I applied? I am confused. Please help me.

 Thanks,

Anshul

Hi,

I have to perform thermomechanical analysis of turning process in ABAQUS as a part of my project.

Is there any documentation or tutorials available for it?

Kindly provide me with links if it is available.

Thanking in advance.