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shahram's picture

ABAQUS 6.11.1 and suitable version of FORTRAN for writing a VUMAT subroutine?

I need to write a Vumat subroutine in ABAQUS 6.11.1, and I dont know where should I begin from exactly? can anybody help me with the suitable version of Fortran for this version of ABAQUS and the steps I need to take for writing a SUBROUTINE in ABAQUS?

 Thank you guys 

Shailendra's picture

Minisymposium on "Plasticity: Bridging the Scales from Micro to Macro" at IWCMM XXII, Baltimore, MD, USA (Sept. 24-26, 2012)

Dear friends and colleagues,

This is to inform you of the minisymposium

Plasticity: Bridging the Scales from Micro to Macro

to be organized at the 22nd International Workshop on Computational Mechanics of Materials (IWCMM XXII) and request you to consider submitting an abstract. The workshop will be held in Baltimore, MD, USA during September 24-26, 2012.

ansys problem

Free Tags: 

i am working on autofrettage process in a cylinder with end caps . and i have problems with it. which material model is better to be used , what is the proper element to model it .  what is the best  number of substeps ? and there are errors when i am trying to apply pressure load.

FEAP - user element subroutines

Choose a channel featured in the header of iMechanica: 

Hi all,

my question is about the history data storage in FEAP.

I am writing element subroutine (elmt01) in FEAP 8.3  for a history dependent problem (crystal plasticity).

Jonathan Zimmerman's picture

Submit an abstract for IMECE-2012 sympoisum "Multiscale Perspectives on Plasticity in Metals"

My co-organizers and I invite you to submit an abstract to the upcoming symposium “Multiscale Perspectives on Plasticity in Metals” at the ASME 2012 International Mechanical Engineering Congress & Exposition (IMECE), to be held November 9-15, 2012 in Houston, Texas. This symposium will explore the unique challenges to understanding plastic deformation in metals and formulating material models that can accurately predict thermo-mechanical deformation.

Postdoctoral positions in statistical modeling of fracture and plasticity

We anticipate the opening of four postdoctoral positions in 2012 to work on statistical aspects of fracture and plasticity,  and in particular on size effects in the fracture of  disordered media and in microplasticity.  The positions will be funded by the ERC Advanced Grant 2011, SIZEFFECTS.

Notes on thermoplasticity

I've recently had the opportunity to take another look at plasticity in the large deformation context.  I've avoided going into geometric and other issues involved with multiplicative deformations (points stressed in earlier blog posts by Giovanni (node/11545), Arash (node/11623)  and Xiabo (node/11599).  Attached are some old notes that I'd prepared some years ago to help me with the details.  I hope they're of use to other students of mechanics.

-- Biswajit

Siamak60's picture

Linking error for Abaqus and Fortran




Oden Warren's picture

EXTENDED ABSTRACT SUBMISSION: Nanobrücken II: A Nanomechanical Testing Workshop, March 22-23, 2012, INM Saarbrücken, Germany

Dear Colleague:

You are cordially invited to attend Nanobrücken II:  A Nanomechanical Testing Workshop, jointly presented by INM - Leibniz Institute for New Materials and Hysitron, Inc., with co-sponsorship from the JEOL company. This is the second workshop in the Nanobrücken series. The workshop's scope has been broadened, and the abstract submission deadline is now February 19, 2012.

Postdoctoral postion in Computational Crystal Plasticity at RPI

There is an immediate opening for a postdoctoral research position in the Advanced Computational Research Lab at RPI, Troy NY to work on Crystal Plasticity Finite Element Methods. Currently we are working on interesting advances in the areas of radiation damage and high strain rate loading conditions. Encouraged to apply are creative, self-motivated individuals with a sound baclkground in computational mechanics, CPFEM and materials science. RPI is home to the CCNI, one of the most powerful university-based supercomputational research facilities in the world.


What is the basic difference between Deformation theory and flow theory of plasticity ?

I am familiar with the flow theory version of the plasticity theory but still quite confused with the deformation theory version of the same.

When a material is modeled using a non-linear elastic model to predict its plastic behavior with no distinction between the elastic and the plastic strain, is it a deformation theory in that case?

Any elaboration in this regard would be really helpful.

Thanks in advance. 

ABAQUS VUHARD subroutine problem


I am working on the simulation of ring rolling. I have written the subroutine for the plasticity part in the subroutine VUHARD and have set the PLASTIC part in material definition to USER.
I dont have HARDENING PROPERTIES so i have set it BLANK. i have set the path of the subroutine in the job defintion part too. But abaqus crashes whenever i try to do DATA CHECK
It says ABAQUS KERNEL EXITED WITH AN ERROR.I dont know why this problem arises?. I am stuck.

Designing copper–zirconium based nanowires for improving yield strength and plasticity via configuring surface atoms

Following our previous work on Cu-Zr nanowire system, in this paper we have shown improvement in various thermo-mechanical properties of nanowire via manipulating the surface atoms. The paper titled "Designing copper–zirconium based nanowires for improving yield strength and plasticity via configuring surface atoms" by Vijay Kumar Sutrakarand D Roy Mahapatra has been published in Journal of Nanoparticle Research. The paper can be downloaded from

Amit Acharya's picture

Anisotropic yield, plastic spin, and dislocation mechanics

(This paper is to appear in the IUTAM Procedia on "Linking scales  in computations: from microstructure to macro-scale properties," edited by Oana Cazacu)

Amit Acharya, S. Jonathan Chapman

Manaliac's picture

Tensile test under LS-DYNA

Dear all,

I would like to run a tensile test under ls-dyna of a mild steel  and
apply a 7000 N load to the dog bone specimen on a explicite scheme.

Unfortunately, I
have wild deformations ( and an error) on the nodes on edges where the
load is applied, so can you please tell me what are the importants
constants (like time termination, mass scale,...) and how to perform a
perfect run?


Have a good day,


Thank you


PhD position at Loughborough University: 'Plasticity in small length scales'

As one of the biggest Departments of its kind in the UK, the Wolfson School of Mechanical and Manufacturing Engineering has an international reputation for being at the forefront of technological innovation and for maintaining extensive links with industry.

Hisham's picture

Literature for Multi-surface plasticity

Dear all,


Can someone please guide me to comprehensive literature for implementing multi-yield surface plasticity in numerical codes. I am not sure if I, properly, understand the algorithm.


Thanks in advance

Best regards,




Hi all,

         My system got shutdown while running a job in Abaqus.15 Gb odb file was generated and now I am not able to open the odb file.It is saying some error about the format.Have anyone came across such a problem.

Pls help me


Zhiqiang Wang's picture

Abstract deadline extended: August 15. ISCM III, Taipei, December 2011, Minisymposium of "Multiscale Methods in Plasticity"

Abstract deadline extended to August 15, 2011 for ISCM III-CSE II in Taipei, Taiwan, December 5-7, 2011. Please submit your abstract to the minisymposium of "Multiscale methods in plasticity".



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