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How to study a inverse problem? Know the orbit, solve the constraint condition.

Dear all,

Now I face a noval problem, and I do not know how to deal with it, even cannot begin the first step.

As we know, the formulation of a classical mechanical question  is given the initial condition and the constraint condition, and solve the unknown orbit. Now I face a inverse problem. I know the initial condition and the orbit, and would like to solve the unknown constraint condition.

Is there anyone could give some seggestion, I don't know how to do it. Thanks.


Selection of element bsed on the location in abaqus using python script.

I'm facing problem while writing a script for a parametric study.
After changing the each parameter the model changes and and the loaction of the interested element changes based on those parameters.
Also the element number changes.
Is there any command in python script to choose the elements based on the location ? 

Thank you in advance

Rajesh Kumar

Master’s (Research)/Ph.D position available in Aerospace Engineering at Texas A&M

A Ph.D. position is available at Texas A&M University in the Aerospace department to work on interactions between fatigue and creep (permanent deformation due to a constant mechanical stress applied) at high temperature in a superalloy. More information are in the attached file.

Shiva Rudraraju's picture

University of Michigan Continuum Physics and FEM lectures available online


Open.Michigan is a University of Michigan initiative that enables faculty, students, and others to share their educational resources and research with the global learning community. As part of this, Continuum Physics and Finite Element Method lectures offered by Prof. Krishna Garikipati are now available online on youtube and

Arash_Yavari's picture

The Geometry of Discombinations and its Applications to Semi-Inverse Problems in Anelasticity

The geometric formulation of continuum mechanics provides a powerful approach to understand and solve problems in anelasticity where an elastic deformation is combined with a non-elastic component arising from defects, thermal stresses, growth effects, or other effects leading to residual stresses. The central idea is to assume that the material manifold, prescribing the reference configuration for a body, has an intrinsic, non-Euclidean, geometric structure. Residual stresses then naturally arise when this configuration is mapped into Euclidean space.

Masters/Ph.D position available

 On behalf

 A fully funded Masters or Ph.D student position is available @ Monash University, Malaysia Campus. The project will be supervised by Dr.Ean Hin OOI ( ). Kindly email your enquiries to

Implementing XFEM in ABAQUS using dynamic implicit step

Is there anybody who has implemented XFEM in ABAQUS using dynamic implicit step? My model runs fine when I use 'static, general' step but when I change it to 'dynamic, implicit' I get following error message"The following XFEM cracks are failing to correctly generate and says crack domain contains invalid element shape." Please let me know what do I need to change in the model to fix this error. 

Thanks so much for your help,


Vinod Kushvaha 

Fan Xu's picture

Bridging techniques in a multi-scale modeling of pattern formation

Bridging techniques in a multi-scale modeling of pattern formation

F. Xu, H. Hu, M. Potier-Ferry, S. Belouettar

International Journal of Solids and Structures (2014), doi:



Simpleware: Application Engineer (CAD, FEA, CFD) Opening - UK

Ref: SL0105 
Salary: competitive (depending on experience)
Location: Exeter, UK

Simpleware is currently looking for a motivated applicant to join the technical support team of our rapidly expanding company. You should be passionate about working with clients by providing technical knowledge and sales support. You will also be responsible for contracted projects throughout the project life cycle which will require you to work very closely with the R&D departments of a range of blue chip corporate companies. 

Simpleware: Regional Technical Sales Manager USA

Ref: SL2003-US 
Pay: Excellent basic and OTE 
Location: USA (different locations possible)

Lecturer / professorship opportunities in Mechanical Engineering at University of Cape Town

The Department of Mechanical Engineering at the University of Cape Town is seeking applicants for the following permanent academic positions:

 Solid Mechanics at the Lecturer / Senior Lecturer level :


Thermo-Fluid Mechanics at the Professor / Associate professor level: 

Multiphysics Simulation Engineer

Veryst Engineering has an opening for a Multiphysics Simulation Engineer to work on problems involving fluid flow, structural mechanics, heat transfer and/or acoustics. Responsibilities include engineering analysis and design. Ph.D. or Masters Degree in mechanical engineering, biomedical engineering, aeronautical engineering, or physics with some industrial experience preferred. Strong academic record and references necessary. Experience with COMSOL Multiphysics, ANSYS, and/or Abaqus is desirable.

generat initial stresses ?

Hi everybody

I am a geotech engineer, I use a program Abaqus, I want to know 
when I use tow layers of soil, each layer with their properties, when i use the contact between these layers

my question is; How i generat initial stresses without discontinuity between the two layers ?


Davide Bigoni's picture

Stress concentration near stiff inclusions

Do singular stress fields exist close to rigid corners?

See the photoelastic investigation at

Jie-Hua Zhao's picture

Intern Opening at Apple

You will be working on stress simulation of electronic components and sensors with a group of brilliant minds here in Apple’s Headquarters. You are a graduate student with good academic standing majoring in Mechanical Engineering, Engineering Mechanics or similar engineering fields. You are a good programmer and familiar with Python. You must be authorized to work in US. The intern position is open immediately. Send your resume to Jeff Zhao (jhzhao at

Acta Mechanica Sinica, Vol.30, Issue 3, 2014 is online now!

Dear everyone!

The third issue in 2014 (Volume 30, Issue 3) of Acta Mechanica Sinica (AMS) is now online.

Welcome to this SCI-indexed journal for rapid publication of your exciting results.


Phase-field modeling and simulation of fracture in brittle materials with strongly anisotropic surface energy

Crack propagation in brittle materials with anisotropic surface energy is important in applications involving
single crystals, extruded polymers, or geological and organic materials. Furthermore, when this anisotropy
is strong, the phenomenology of crack propagation becomes very rich, with forbidden crack propagation
directions or complex sawtooth crack patterns. This problem interrogates fundamental issues in fracture
mechanics, including the principles behind the selection of crack direction. Here, we propose a variational

Problem in steel connection model using abaqus

Hello Everyone,

I'm trying to model an extended shear tab connection using ABAQUS 6.13-2, I've tried to model 4 connections and I compared the results I've got with the experimental work, and I noticed that the FEA is way stiffer that the experimental work, I have only one warning and it says "If significant clearance/overclosure exists between surface pair (assembly__pickedsurf579,assembly__pickedsurf580) and the master surface does not have rotational degrees of freedom, adjustment is recommended for correct enforcement of the tie constraint"

Workshop on Microfluidics : Nanofluidics : Multiscale CFD, Registration deadline extended

Please join us for a national workshop on Microfluidics and Nanofluidics near Delhi, India during 14-16 July 2014. We are happy to have some higly accomplished academician in multiscale CFD domain. Prof. Suman Chakraborty, Bhatnagar Awardee 2013 will be principal instructor and speaker in the event.

Linking between MKL, LAPACK and ABAQUS

Hi everybody,

I'm an ABAQUS UEL user. I have Intel Parallel Studio 2013 installed on my computer with Visual Studio 2013 and ABAQUS 6-12.3

I'm almost a begginer in this area. I realized that Intel Composer XE 2013 (which has been intalled on my machine) contains MKL which has BLAS and LAPACK libraries in it.

I tried to use some of their functions (let's say eigenvalue solver and SVD solver). When I'm
trying to run it (abaqus job=test user=test1 int) I'm getting this error

Compression buckling of polymeric beam/column


I have a problem with a stacked colum of elastomeric membranes (natural rubber or silicone).

I am looking for a compression buckling criterion that applies for hyperelastic materials in presence of large deformations (up to 400%).

I've read about Haringx formula, that should apply for these materials, but I suspect that it is valid for small strains only.

My question is:

- is there a suitable buckling criterion for this case?


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