User login

Help with curved specimen and mechanical loading

Rib fractures in infants are highly suggestive of child abuse. I am performing mechanical testing and finite element analysis on pig ribs with the aim of characterising the behaviour of ribs under anterior-posterior (from end to end rather from the side) loading.

Help needed:

Julien Yvonnet's picture

Multiscale method with model reduction

Model reduction based on Propper Orthogonal decomposition is widely used in Computational mechanics to reduce the number of degrees of freedom in systems. In the attached papers, we introduced a POD-based model reduction in a multiscale framework to significantly reduce the computations.

Dr. Michael Nosonovsky's picture

PhD at the University of Wisconsin-Milwaukee

I am looking for a PhD student (RA) in Mechanical
Engineering to start in Sept. 2010. The topic is in modeling in tribology
(biomimetic surfaces, contact mechanics, adhesion). The initial support (RA) can be
provided via INSIC TAPE grant and other sources. Interested persons should send
their resume to me at nosonovs AT The admission criteria for the PhD
degree can be found at

A very basic doubt in Strength Of Materials

Hi Members,

                   This may seem a very basic or even stupid question to you all , but it still leaves me with a doubt regarding the concept behind the WHY and HOW of this. So however trivial this may seem Please bear wiith it and Help me Clearify my concept and getting the right idea.

 This is regarding the " Seperation Of the Beam at the Internal Hinge"  during the solution for S.F.D and B.M.D. in any general example involving a beam loaded with point loads and moments.

ruzzene's picture

Short Course on Wave Propagation in Periodic Linear and Nonlinear Media

Short Course on

Wave Propagation in Periodic Linear and Nonlinear Media

will be held at CISM, in Udine Italy (June 21-25, 2010). See course brochure attached

Massimo Ruzzene

Eran Bouchbinder's picture

Postdoctoral/PhD position

A postdoctoral/PhD position in various non-equilibrium problems in solid mechanics is available at the Weizmann Institute of Science. Candidates should have a strong background in physics and/or theoretical mechanics, as well as experience with analytical and computational methods for solving partial differential equations. More details can be found in For information about specific research projects, please send CV, a publications list and a statement of research interests to Dr.

Arash_Yavari's picture

Finite-Temperature Atomic Structure of 180^o Ferroelectric Domain Walls in PbTiO_3

In this letter we obtain the finite-temperature structure
of 180^o domain walls in PbTiO_3 using a quasi-harmonic
lattice dynamics approach. We obtain the temperature dependence of
the atomic structure of domain walls from 0 K up to room
temperature. We also show that both Pb-centered and Ti-centered
180^o domain walls are thicker at room temperature; domain
wall thickness at T=300 K is about three times larger than that of
T=0 K. Our calculations show that Ti-centered domain walls have a

Temesgen Markos's picture


This month's issue of SIAM news had a beautiful story of how one hard problem in mathematics was solved in less than six weeks using online collaboration. SIAM's story is not online yet, but here is another link to the same story .   SIAM news refers to a "super-mathematician" coming out of several individual mathematician spread all over the world.

Rubber fatigue testing. Displacement Controlled tests vs Force Controlled test


 I need some advice about the next topic. I've been asked to develop a Haigh Diagram for Natural Rubber as André et al.{1} or Saintier et al. {2} do, and from it, be able to predict the fatigue life of a train suspension. This authors carried out the fatigue tests under displacement control and they considered that the sample had failed when a 1mm crack appeared, because they were studing the crack initiation.

Axisymmetric mesh in ANSYS Workbench

Free Tags: 

Hi everybody,


I am trying to investigate a biaxial membrane inflation experiment of human aortic tissue by the help of ANSYS Workbench. Before examining the actual anisotropic tissue I however am trying to create a model based upon a hyperelastic, but still isotropic, material. I have chosen the pre-listed neoprene rubber in ANSYS Workbench.


Mike Ciavarella's picture

Suresh's group Fighting Malaria: Understanding the Biomechanical Properties of Red Blood Cells

Suresh's group Fighting Malaria: Understanding the Biomechanical Properties of Red Blood Cells

Subra Suresh with Quinn

MIT Dean of Engineering Subra
Suresh with graduate
student David Quinn. Photo: L. Barry Hetherington


NANOVEA's picture

Nanovea Chosen by TUM of Germany to Further Research

 Nanovea is proud to announce the installation of a Nano/Micro Mechanical Tester at Technische Universitat Munchen (Technical University of Munich, DE). The instrument was installed in the Department of Civil Engineering & Surveying at the CBM Center for Building Materials.

Zhigang Suo's picture

Crack Bridging. Lecture 2

These notes belong to a course on fracture mechanics

Lecture 1 introduced the crack bridging model. The model is also known as the cohesive-zone model, the Barenblatt model, or the Dugdale model. The model consists of two main ingredients:

Post-doctoral position in atomistic modelling

The School of Mechanical and Aerospace Engineering in Nanyang Technological University, Singapore, is looking for a highly motivated researcher for a three-year Post-doctoral Fellowship in the area of atomistic/molecular dynamics modelling.

The research project is computational based and will focus on the atomistic modelling of lubricant and diamond-like carbon. The work will include molecular dynamics simulations, code programming and publications of research papers. The successful candidate will also have to work closely with scientists from A*STAR.


N. Sukumar's picture

Linear scaling solution of the all-electron Coulomb problem in solids

In this manuscript (available at, we present a systematically improvable, linear scaling formulation for the solution of the all-electron Coulomb problem in crystalline solids. In an infinite crystal, the electrostatic (Coulomb) potential is a sum of nuclear and electronic contributions, and each of these terms diverges and the sum is only conditionally convergent due to the long-range 1/r nature of the Coulomb interaction.

Bo Li's picture

How is the entropy of polarization in dielectric material

In the study of thermoelastic actuation of dielectric elastomer, we can write the Helmholtz free-energy as a function of stretch ratio, nominal electric displacement and temperature (T).

The entropy (S) is the negative partial differential coefficient of W with respect of temperature (T). And we can see the change of S is due to three components: deformation, heat conduction and polarization. In an isothermal state, the deformation part has been fully investigated by Arruda and Boyce in 1993, but the polarization-induced entropy (Sp) has not been clearly stated.

A PhD student position is available on nonlinear multiscale modeling of materials


A PhD student position is available on nonlinear multiscale modeling of materials for Fall 2010. Please contact ASAP

 X. Frank Xu, PhD, Assistant Professor
Dept of Civil, Envir & Ocean
Stevens Institute of Technology
Hoboken, NJ
201-216-8739 (Fax)


Failure criteria for fabric composite or woven composite

Hi All,

Most exisiting failure critera delevolped for fiber composite laminates and they are rough estimations for fabric composite. I want to know if there is a suitable failure criterion for fabric composites.



Workshop on Discrete Differential Geometry for Multiphase Flow Problems

23rd - Saturday 24th, April 2010

BS 2003, Indiana University Purdue University Indianapolis

Bent F. Sørensen's picture

Open position: Senior Researcher in the area of processing of polymer matrix composites at Risø DTU, Denmark

The Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, is seeking candidates for a Senior Researcher position in the area of processing of polymer matrix composites to develop innovative strategies and to improve current methods of manufacturing polymer matrix composites for the energy and transport sector. 

Risø DTU has close collaboration with the leading wind turbine blade manufactures such as LM Glasfiber A/S, Vestas Wind Systems A/S and Siemens Wind Power A/S.   

Manoj Krishna Majumder's picture

Regarding thermo mechanical simulation of Hot rolling

Hi ,

    I have to do a thermo mechanical simulation of rolls (which is used for hot rolling process). I did plain starin cold rolling problem using 2-d analytical rigid surface. But I am quite confused to do the same for hot rolling process. Since during hot rolling thermal load also comes into play. Now how to solve this thermo mechanical coupled problem is an utmost question to me. I have tried to understand the heat transfer problem from given examples of friction brake disk. But it was not cleared.

Opening for a Post-doc poistion


Professor Wing Kam Liu's group at Northwestern University is looking for a postdoc or a research associate who is good at multiscale methods development, nonlinear finite elements, and has good knowledge of plasticity with some knowledge of high performance computing.  Interested applicants please contact:





Subscribe to iMechanica RSS Subscribe to iMechanica - All comments

Recent comments

More comments


Subscribe to Syndicate