Hello everyone,

 I am implementing a uel user subroutine in ABAQUS. This uel is for modeling contact in X-FEM framework. Thus, it's a nonlinear problem and I need to store some solution dependent variables during each iteration. I know I can store SDVs in SVARS. But this vector will update at the end of each step, and not during iterations. Anybody knows about this problem?

 I really appreciate if anybody can help me with this.

    Thanks

    Ehsan 

(Closing date:

15 December 2011) £24370 - £28251 per annum (Grade 5), £29972 - £35788
per annum (Grade 6). 3 posts
http://www.cardiff.ac.uk/jobs/engin/research-assistants--research-associ...

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We are looking for a Post-Doctoral Fellow in the area of Computational Mechanics. The position is available within the Institute of Structural Mechanics, chair of Computational Mechanics at the Bauhaus University Weimar, Germany. The key research areas of the chair of Computational Mechanics are Multiscale Modeling of Materials and Isogeometric Analysis.

Qualification
The candidate must have a PhD and M.Sc. in one of these disciplines: Mechanical Engineering, Applied Mathematics, Computational Physics, Computational Materials Science or Structural Engineering. 

Imperial College London
Department of Mechanical Engineering

Applications are invited for a research studentship in the field of Advanced Tomographic Microscopy for Damage Modelling in Steels, leading to the award of a PhD degree.  The post is supported by a bursary and fees (at the UK/EU student rate) provided by EPSRC.  The studentship is for 3.5 years from October 2011 (or to start soon after) and is available for UK and EU candidates meeting the Research Council criterion of having been resident in the UK for the previous three years. The student will benefit from collaboration with Tata Steel, a leading global metal processing company. Tata Steel will also provide a bursary top-up; the total bursary will be approximately £19,000 per year tax-free. The student will also benefit from use of the Diamond Light Source, and interactions with scientists at both the Diamond facility and University of Manchester.

Please read attached advert for further details.  

Hi everybody,

I am anurag working on damage mechanics of 2x2 twill woven composite, i will conduct the carbon/epoxy laminates under various regimes of service loas (quasi static  loading, low velocity impact, fatugue, post impact) and will also model crack propogation of the same using XFEM.I have studied FEM at graduate level.

Initially i will calculate mechanical properties of woven composite using unit cell method by applying homogenization process.

Now please guide me how to handle the above modelling procedure. Please give basic idea in terms of any research paper or any useful handout or any website. Your any useful comment or help will relax me mentally. plz send me any reference if possible

Thanx and Regards

Anurag 

Hi all,
I 'd like to ask whether anyone has applied XFEM for a user-material (UMAT). What is the process to do that? Could anyone provide some advice, documentation or guidelines?

All the best,
            
Panos

p.s. I 've heard that a UEL code is needed to couple XFEM with UMAT.

Dear Colleagues,

I would like to invite you to submit an abstract to the XFEM session of the  
SES 2011 Annual Technical Meeting of the Society of Engineering Sciences which will be held this October 12-14, 2011, at Northwestern University in Evanston, Illinois. 

11th US National Congress on Computational Mechanics

July 25-29, 2011. Minneapolis, MN

A mini-symposium on Meshfree and Generalized/Extended Finite Element Methods

Abstract submission deadline: January 31, 2011 (minisymposium 3.5)

Call for papers

I would appreciate it if you could tell me the analytical soluton of strain energy of infinite plate with an inclined central crack under tension.

Thanks so much.

I am working on crack propagation analysis of lamellar microstructures using XFEM. everything is working fine but i have an annoying observation that whenever i change the damage stabilization parameter let say from 1e-5 to 1e-6 then the force-displacement curves changes abruptly and the force which i am measuring on a reference node of my indenter varies two to three times. i tried to see if damage stabilization parameter effect the F-D curves and i observed that crack length and F-D curve changes. I had a look in abaqus documentation but there no creiteria is given for the selection of the damage stabilization parameter. Can anybody explain who to select the right damage stabilization parameter as it really changes the whole results.

Dear colleagues,

Apologies for cross postings.

The second ECCOMAS Thematic Conference on the eXtended Finite Element
Method (XFEM) will take place in Cardiff (Cardiff University) in the
period 29 June - 1 July 2011. [see http://www.xfem2011.com for
details]

We would like to invite you and your students to submit original
research contributions in the area of partition of unity enrichment.
In particular, we welcome contributions to the following topics:

-         Mathematical foundations, a priori error estimates, modified
XFEMs, cut-off

Hi,

     Is it possible to use 2-D finite elements capable of accurately predicting all stresses (three dimensional stress state) for 3-D crack growth simulation?

Subramanian

A PhD position is available at Centre Henri Tudor (Luxembourg) and Cardiff University (UK) on the simulation of crack propagation with adaptive extended finite element methods.

Candidates from any country are eligible. 

Please contact me for details.

Stephane

A fully funded PhD position is immediately available in the area of multi-scale modeling of geomaterials within the research project "Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE" at Laboratoire Sols, Solides, Structures - Risques (3S-R), Université Joseph Fourier, Grenoble, France.

A fully funded PhD position is available in the area of multi-scale modeling of geomaterials within the research project Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE at Laboratoire Sols, Solides, Structures – Risques (3S-R), Université Joseph Fourier, Grenoble, France. 

Hi all,

 I´m traying to simulate a low-cycle fatigue crack growth in Abaqus 6.9 using xfem. My problem is to add the low cycle method to the xfem solution. 

I believe that the only current option for this would be to manually
create the loading curve and to do the analysis by a brute force
method but i may not be correct in this assumption however.

Please could someone explain a brief method.

i appreciate in advance.

I think a non-zero entry in the stiffness matrix doesn't necessarily imply dependence of ith DOF on the jth DOF. This is the case also for standard FEM (without any enrichments). For example for a quadrilateral 2D element the x component of displacement has interaction with y component at each node, but as we know, two independent values of translation in x and y directions can

There is a basic problem in NATURE of approximation of discontinuity in element using XFEM.I tried to illustrate that below:
for example, If you consider an element with strong discontinuity( like fracture or contact) which usually we use heaviside function as enrichment function. we expect two parts of element deform independently because of nature of problem.