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The Fourth Biot Conference on Poromechanics

The Fourth Biot Conference on Poromechanics will be held from June 8 to 10, 2009, at Columbia University, New York City. The conference web site is located at:

We are now calling for abstracts. Please send the one-page abstracts by e-mail to (deadline: May 31, 2008).

PhD projects in computational fracture and computational/theoretical fluids at University of Melbourne

The Australian Mineral Science Research Institute (AMSRI) is a consortium of Australia's best scientists working in minerals industry-related fields. Research activities span the breadth of minerals processing, with major themes of the research being energy efficiency, frugal water use and efficient management of waste. The Mathematics program of AMSRI performs modelling and analysis research across multiple minerals processing areas, including comminution, flotation and waste treatment.

a question about ALE method

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hi, I'm a student studying ALE method. In the book of "Nonlinear Finite Elements for Continua and Structures" written by Ted Belytschko el, conservation equations which discribed in the reference configuration and current configuration are given out (see chapter 7). But how about Balance Laws in initial configuration?

Mike Ciavarella's picture

a review of a paper by HD Bui found in the internet !!

dear iMechanica friends

I came across a review of a paper by HD Bui who was somewhere in the internet, and I find it is very interesting. I could even have written this review myself !!  I don't think the reviewer exaggerates....


difficulties CONTACT problem with plasticity using ABAQUS FEA code.

Hello everyone:

1.  I have built a FEM model 2D plane strain using ABAQUS/Standard (CPE4R) elements,

2. I am  modeling the contact between a cylinder and a plate in 2D.

3. The Cylinder material is given is ELASTIC ISOTROPIC material with no plasticit E=310 GPa

4.  The plate is with a Ramberg-Osgood plasticity with a Young's modulus E=210 GPa.

5. The mesh at the the contact point is VERY refined element characteristic length is about 1 micron. (My model units are  (mm,N,sec)).

Dean Eastbury's picture

Michael Ortiz wins inaugural Rodney Hill Prize in Solid Mechanics

I am delighted to announce on behalf of Elsevier that Professor Michael Ortiz of CalTech has won the very first Rodney Hill Prize in Solid mechanics in reconition of his body of research during the decade 1998-2007. The prize will be presented at ICTAM in Adelaide on 27 August by Y.S. Chi, Vice Chairman of Elsevier immediately prior to Michael's Hill Prize lecture. For more details please see

Dean Eastbury


Two PhD positions available in the Netherlands

Two four-year PhD positions are available in the area of computational mechanics at the Materials Science and Engineering Department of Delft University of Technology. The job descriptions are attached.

Mike Ciavarella's picture

Rail corrugation: ”one hundred years of solitude”? or a true enigma?

You may remember that I promised some time ago to discuss each of the topics mentioned by Ken Johnson in his Timoshenko Medal speach. Here I take rail corrugation. Rail corrugation has been noticed at least for 100 years, but (particularly short pitch one in the range 20÷80 mm) has been considered an enigma because measured corrugation wavelength did not relate well with wear instabilitymodels.

Dean Eastbury's picture

Issue 2 of J. Mechanical Behavior of Biomedical Materials published

I am pleased to announce that Volume 1, Number 2 of the the recently-launched Journal of the Mechanical Behavior of Biomedical Materials ( has been published by Elsevier. All JMBBM articles can be accessed free-of-charge on ScienceDirect until September 2008 (

Li Han's picture

The effect of porosity on the stiffness and fracture energy of brittle organosilicates

Integrating porous low-permittivity dielectrics into Cu metallization is one of the strategies to reduce power consumption, signal propagation delays, and crosstalk between interconnects for the next generation of integrated circuits. However, the porosity and pore structure of these low-k dielectric materials also strongly affects other important material properties besides their dielectric constant.

Sam Daly's picture

"Experimental Multi-Scale Mechanics" Symposium for SES 2008

A symposium on Experimental Multi-Scale Mechanics is being organized for the 2008 SES conference at the University of Illinois at Urbana-Champaign from October 12th through October 15th. The conference website is located at

To submit abstracts to this symposium please use the abstract submission form and select the symposium title. The deadline for abstract submissions is April 30, 2008.

Deformation and Fracture of Functional Ferromagetics

Prof.D.N. Fang and his collaborators (Prof. Y.P. Wan, Prof. X. Feng and Prof. A.K. Soh) work on the functional materials, such as ferroelectric and ferromagnetic materials. Recently, he published a review article which presents an overview of recent progress on magnetomechanical deformation and fracture of ferromagnetic materials.

Mike Ciavarella's picture


Hello imechanica users: I launch a few ideas. Can we improve imechanica stealing ideas from successful web systems like google, amazon, wikipedia, myspace, youtube? Taking the best of the various worlds to improve our imechanica?

Position Available for Post Doc on Computational Bio-Nanomechanics

Job Description :Postdoctoral fellow position is available in Computational Biomechanics/Nanotechnology at University of Texas at Arlington. The candidate is expected to have a good education and research background in numerical modeling (Fortran/C++/Matlab). The candidate will use numerical methods to study biophysical phenomena in cells and biomolecules and micro/nanofluidic problems in BioMEMS/NEMS, from continuum to nanoscale. Candidate familiar with fluid/solid mechanics and atomistic simulation are highly encouraged to apply. If you are interested, please contact Dr.

How to deal with the singularity in calculation of a closed shell of revolution?

I want to numerical calculate vibration of a closed shell of revolution with double layers. There exists Coefficient cot(θ) in the governing equation, where θ is angle between the revolving axle and normal line. Therefore, cot(θ) will incline to infinity when θ is close to zero for the vertex point on the revolving axle. How to deal with the singularity? Can you give me some advices or reference article? Thanks.

Hanqing Jiang's picture

Finite Width Effect of Thin Films Buckling on Compliant Substrate

Buckling of stiff thin films on compliant substrates has many important applications ranging from stretchable electronics to precision metrology and sensors.  John Hutchinson, Zhiggang Suo, Rui Huang, Xi Chen et al. have developed nice theories for stiff thin film buckling on soft substrate.

Hanqing Jiang's picture

Yonggang Huang was awarded the Guggenheim Fellowship in 2008

Prof. Yonggang Huang of Northwestern University was awarded the Guggenheim Fellowship in 2008. Today, the president of the John Simon Guggenheim Memorial Foundation, Edward Hirsch announced that 190 new fellowships were choosen from more than 2,600 applicants (news ). Yonggang won the competition because of his achievement on atomistic-based continuum theory for nanomaterials. A complete list is here

Difference between Continuum Damage Mechanics approach and Fracture Mechanics approch

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Dear Friends,

What is the difference between Continuum Damage Mechanics approach and Fracture Mechanics approach?

With regards,


Pradeep Sharma's picture

How shell-like is a carbon nanotube?

(Carbon) Nanotubes have attracted considerable attention from the mechanics community; probably second to none when it comes to nanotechnologies. Although I personally have done very little in this particular topic, I have enjoyed reading about the many developments made by mechanicians in terms of modeling the behavior of nanotubes and the applicability of standard continuum mechanics notions. A post on this subject on iMechanica, which received a fair amount of attention from many mechanicians involved in this topic, may be found here .

Elastic solution for a hole in an infinite space

Dear All,

the solution of an elastic half space subjected to any generalized load may be seen as the solution of another elastic problem, that is elastic space with an infinite length hole when the hole radius goes to infinite.

Is there a "general" solution for that elastic problem? For general I mean a solution that can be used e.g. like a kernel in a convolution operation.

Mike Ciavarella's picture

A "crazy" theory to explain the Rubinstein, Cohen & Fineberg’s Detachment fronts of friction

Recent experiments in sliding friction are a major embarassment for all present understanding of friction using Coulomb or Rice-Ruina-Dieterich-Prakash rate-state dependent theories, which are the subject of large research programs. In particular, Rubinstein et al; (Detachment fronts and the onset of dynamic friction. Nature 430, 1005—1009. 2004) suggest that the contact area is not significantly altered by the fast fronts which perhaps are only precursors to the most important "slow fronts" travelling at speeds about 1/10 of the Rayleigh speed.

The Department of Engineering Mechanics, University of Nebraska-Lincoln, invites applications for a Research Assistant Professor

To enhance its leadership position and focus for the future, UNL CoE is now deploying a new strategic approach in biomaterials, focusing on novel experiments and ground-breaking research. UNL external research funding has tripled in the last decade. The investment of these funds enables the university to support innovative research projects, hire top faculty and provide them with equipment and facilities to achieve their goals. 

Pradeep Sharma's picture

Open Faculty Position at University of Houston in Nanomechanics, Computational Materials Science

University of Houston
Department of Mechanical Engineering
Cullen College of Engineering
Faculty Position-Nano Mechanics, Nano Materials

A question about electric displacement intensity factor of interacting cracks in piezoelectric materials

I am working on the problem of interacting cracks in piezoelectric materials. Due to the interaction of cracks, I found a non-intuitive phenomenon that the electric displacement intensity factor of the crack for some interacting profiles may be negative under some loading conditions (a tensile stress and an applied electric displacement). However, under the same loading conditions, the electric displacement intensity factor can never be negative for a single crack problem.


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