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Debugging standard user subroutines of ABAQUS

Submitted by Hamid.Mirkhani on

Hi,

I managed to find a way to debug UMAT step by step. I tested it on ABAQUS 6.9 using intel fortran 11.0 which is integrated with Visual Studio 2005 or 2008 running on Win 7/x64. The process is the same for other versions and other user subroutines (The same process should also work in linux, but with different debugger).

Using VGETVRM to compute strain in VUSDFLD ( abaqus explicit subroutine)

Submitted by arash_n on

hi everybody.

I've used vgetvrm in vusdfld to calculate strain.

I have two question.



1- what's the differences between tensor strain and engineering strain?

I read user subroutine manual and it says"The shear strain components returned from utility subroutine VGETVRM are tensor components and not engineering components."



2-I want to calculate PE11 and PE22 with vgetvrm. but my results are strange.for example PE11 change between -11.14033 and 75.25797.

and PE22 change between -1.5974975E-04 and 4.7500171E-03

Graduate Student Researcher Position in Biomedical Device Development Research Seeking Ph.D. Degrees

Submitted by yjchun on

The BioManufacturing and Vascular Device Laboratory at the University of Pittsburgh seeks a dedicated Graduate Student Researcher, interested in developing novel manufacturing processes and realizing advanced biomedical devices (http://www.pitt.edu/~yjchun/home.html). 



abaqus superelastic ( Auricchio's model)

Submitted by samo on

good morning,

im PHD student in france working in stent problems,

i want to simulate only superelastic model of nitinol in ABAQUS (   

Auricchio's model)

some doc are available in th internet, but still confused



how can i idintify this material in Abaqus?

do i have to code this model and write subtoutine in fotran  or it 

already exists in ABAQUS ?

what is in summery  the steps that i have to do??

thanks 4 giving some of ur time 4 this question

ALTNJI.

BEST REGARDS.

Hysteretic damping in modal analysis using ANSYS

Submitted by saeed_11 on

Hello,

I want to do modal analysis of a structure with viscoelastic material. The viscoelastic
material has a complex youngs modulus E= E (1+i*g), where g is the loss factor. In ANSYS, modal analysis ignores all
nonlinearity, so how can I perform modal analysis with viscoelastic material?

OR

How can I perform modal analysis in ANSYS considering hysteretic damping (complex Young’s
modulus  E= E (1+i*g) as input).


Cheers

 

viscoelastic in abaqus

Submitted by damasolo on

HI all,

sorry my bad english,anyone could help me?

I' am a begining in abaqus, why the data in abaqus viscoelastic model are entry with shear test? and not with uniaxial test?

 How introduce they for polymers materials?

 

 thank you

J Plastic Calculation

Submitted by nsanteb on
Dear All:
 
I completed calculating my stress-intensity factors by  modifying the verification test case  in ANSYS 
I need to calculate the J-plastic values for  Ramberg-Osgood type material using isotropic hardening for various n values . 
Does ANSYS have a Ramberg-osgood material model built in ?