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Zhigang Suo's picture

Large deformation and instability in gels

I'm attaching slides of a talk that I gave yesterday at the Schlumberger-Doll Research Center.  In preparing the talk, I made liberal use of slides prepared by Wei Hong for his own presentations.  The talk is mainly based on the following papers:

Postdoctoral position at RPI in modeling respiratory motion during cancer radiation therapy

Brief description: There is an
opening for a postdoctoral research position in the Advanced Computational
Research Laboratory at RPI, Troy, NY to work on an ongoing R01 reesearch project sponsored by the National Institutes of Health on the modeling of respiratory motion from patient-specific 4D CT images.
In external beam radiation treatment, a lethal radiation dose is delivered through precisely conformed

Journal Club Theme of March 1: Measuring Cellular Tractions

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Cell tractions are the outcome of the complex process of cytoskeletal force generation that cell uses to maintain structural stability, to sense the physical environment and to propel itself.  We are only now beginning to understand the process of cytoskeletal force generation, and we cannot yet say much about the losses in transmission through focal adhesion/integrin complexes (attachment ‘islands’ at the cell-substrate interface), but we can definitely measure the tractions that result from cytoskeletal force generation.  The mechanics behind the measurement method might be of interest to the wider audience of iMechanica, as it involves an interesting inverse problem and different solution methods that have incited lively discussions in past years.

Seeking candidates for positions in Houston, also positions in Germany

Our agency, Reliability Analysis Associates, Inc., specializes in recruiting Reliability Engineers and related skills.   For a client in the oil business in Houston, TX we are seeking candidates for two positions that require knowlege of finite element analysis, crack growth, reliability, and low cycle fatigue.   The two job descriptions are attached.


Yanfei Gao's picture

Not just another pillar compression paper

We show that it is possible to distinguish between homogeneous and heterogeneous dislocation nucleation on the basis of differences in experimentally measured theoretical strengths. From nanoindentation tests, the critical shear stress for dislocation nucleation in two different Mo-alloy single crystals (Mo-3Nb and Mo-10Al-4Ni) is found to be ~1/8 of the shear modulus. The corresponding stress in uniaxially compressed Mo-10Al-4Ni micropillars is ~1/26 of the shear modulus.

I have trouble understanding the boundary condition in the famous soft tissue free swelling problem

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if you are familiar with the cartilage free swelling problem, you must have seen the boundray condition on cartilage-solution boundary where Mu=Mu*. Does this mean or imply that concentrations (or densities) of the components as well as the pressure on the boundary are the same as of those in the solution, i.e. does it mean that apparent density of water and ions are equal to the free solution and therefore are constant on the boundary. because that means the boundary is in equilibrium with solution and therefore the strain value on the boundary is set to zero.

Position in R&D with Schlumberger

Schlumberger, in relation with its R&D effort related to Co2 Storage
(, is looking for a highly innovative
and motivated individual with a background in geo-mechanics to join its
multi-disciplinary engineering team. A PhD in a field related to
geo-mechanics (Solid mechanics, fracture mechanics, civil engineering,
geophysics etc.) is necessary. No prior work experience is required. The

Differences between cohesive/interface/embedded process zone

I am PhD student and i'm working on the behavior of bonded joints under impact and i have one question :What are the differences between a cohesive element, an interface element and a embedded process zone element ?  Do they have fundamental differences or it's only a difference of the cohesive law expression.

New (Free!) Solid Mechanics Textbook

I have posted an advanced solid mechanics textbook on

It works on Internet Explorer, but may not work on all browsers. Topics include: mathematical descriptions of deformation and forces in solids; constitutive laws; analytical techniques and solutions to linear elastic and elastic-plastic boundary value problems; the use and implementation of FEA; fracture mechanics; and the theory of deformable rods, plates and shells.

Tian Zhi Luo's picture

on-line visualized experiments

Please visit

You'll find tons of video about biological experiments you might be interested in. It is very useful for most of mechanicians who lack this kind of knowledge and experience. Enjoy yourself!

Luoyu Roy Xu's picture

ASME Congress IMECE09 Topic on the Mechanical Behavior of Nanocomposite Materials

You are invited to present your research work on the mechanical behavior of nanocomposite materials (Nov. 13-19, 2009 in Florida ). This topic will be focused on systematic mechanics experiments, modeling and simulations to solve new challenging mechanics problems such the effect of nanofiller agglomeration on the stiffness and strength reduction; interfacial stress transferring and interface strength evaluation at the nanoscale.

Postdoctoral Scholar in Computational Fuel Cell Catalyst Design at IUPUI

A postdoctoral research position in first-principles based
multiscale modeling of catalysts for PEM fuel cells is available immediately at
the Richard
G. Lugar Center for Renewable Energy in Indiana University-Purdue University
Indianapolis (IUPUI). The candidate will work on a
project on developing low-cost yet high-performance low temperature fuel cells.
This project involves close collaborations with the experimental scientists.
The candidate should hold a doctor degree in a relevant discipline, such as Materials
Science, Mechanical Engineering, Chemistry, or Chemical Engineering. The ideal
candidate should have a strong background in atomistic scale simulations
(Density Functional Theory, molecular dynamics, and Monte Carlo methods) and scientific

ASME IMECE2008 Symposium on Multifunctional Materials and Material Systems

The ASME Multifunctional Materials Technical Committee of the Materials Division is organizing a symposium on Multifunctional Materials and Material Systems at IMECE2008 to be held in Boston, MA during Oct. 31-Nov. 6, 2008.


Abstract submission deadline: March 3, 2008 


ASME IMECE08 Minisymposium on Mechanics of Nanoporous Materials

This symposium will provide a forum for researchers to discuss the most recent developments in the synthesis, characterization and applications of various nanoporous materials systems such as nanoporous thin films and coatings, with a special focus on the various mechanics issues of this special class of materials.

When: Oct. 31-Nov. 6, 2008 in Boston, MA

Deadline for abstract submission: March 3, 2008

Konstantin Volokh's picture

Prediction of arterial failure

We enhanced a bi-layer fiber-matrix microstructural arterial model with softening and analyzed the artery inflation under the internal pressure. Numerical simulations lead to the following three findings. Firstly, it is found that the fiber strength dominates the strength of the media layer. Secondly, it is found that the strength of the media layer dominates the overall arterial strength and plays the crucial role in the load-bearing capacity of arteries. Thirdly, it is found that residual stresses can increase the overall arterial strength significantly. The pre-existing compression in arteries delays the onset of rupture like the pre-existing compression in the pre-stressed concrete delays the crack opening.

Fiber Composites Failure Criteria

  A new failure criterion has been formulated for fiber composite materials.  It is the anisotropic counterpart of a recently derived isotropic criterion.  The targeted applications are for carbon fiber, polymeric matrix (or equivalent) types of materials.   The complete treatment can be accessed at the new website:                                                       

Postdoctoral position in multiscale modeling at RPI

There is an opening for a postdoctoral research position in the Advanced Computational Research Laboratory at RPI, Troy, work on an ongoing project sponsored by the Office of Naval Research. The project involves the multiscale modeling of particulate composites under extreme loading conditions. This is a great opportunity to be involved in challenging
multiscale computational techniques based on meshfree methods. Encouraged to
apply are creative, self-motivated candidates with a sound background in
computational mechanics.

Ying Li's picture

Buckling behavior of metal film/substrate structure under pure bending

Many studies on the thin film/substrate structure and its failure mechanism were reported in recent years. The direct experimental results of thin film/substrate structure by scanning electron microscopy (SEM) presents an intriguing problem:there exists a buckling failure mechanism at the lateral edge of metal film under pure bending. The qualitative theoretical analysis has been done on such buckling failure of thin film/substrate structure.


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