likask's picture

Corotational formulation for 3D solids

Pleas have look
This paper presents theory for the Lagrange co-rotational (CR) formulation of finite elements in the geometrically nonlinear analysis of 3D structures. In this paper strains are assumed to be small while the magnitude of rotations from the reference configuration is not restricted. A new best fit rotator and consistent spin filter are derived. 


Pradeep Sharma's picture

Two Openings for Post-doctoral Fellows at University of Houston

Two post-doctoral fellow positions are available in Sharma's research group at University of Houston. Potential candidates can visit the following website to get an idea of the kind of research projects undertaken in this group: The positions are for one year but renewable for a second year upon satisfactory performance. Candidates are expected to be familiar with both atomistic calculation methods and continuum mechanics. Potential research projects are somewhat open-ended and range from nanocapacitors for energy storage, atomistic calculations for slow events, to multifunctional materials. Please send a detailed CV along with a list of three references to

Aman Haque's picture

See while you Measure: In-situ Studies in Mechanics (September Journal Club Topic)

*Participation to this club is as easy as i) sending a reference/abstract of your paper if you are working in this area or ii) send a challenge concept/issue/expt if you are not experimentalist :)*  

The September 2011 journal club theme is “In-situ Studies in Mechanics”. The basic concept is to perform the experiments under a microscope, so that the typical quantitative information (stress, strain, crack length to name a few obvious ones) is augmented with real time microscopy output. The advantages are many-fold; (i) one can ‘see’ the deformation and failure process to reduce intelligent guesses in modeling (ii) experimental/boundary condition accuracy is enhanced, particularly for nanoscale specimens, (iii) access to various domains typically not considered by the mechanics community. The power of visualization actually goes beyond these three salient features, a vicarious example of which is the Journal of Visualized Experiments ( It is not really a mechanics journal, but the concept of expressing your thoughts and experiences with pictures and video boosts efficiency and liveliness in dissemination and learning instantly.

Ajit R. Jadhav's picture

Journals in Physics and Engineering, and Preprint Servers Like arXiv

Hi all,


1. In the past, we have had quite some discussion regarding both open-access and open-access journals. However the slant in this blog post is different. I am not concerned here much about open-access journals per say.

Here, I am concerned about the policies that the prominent commercial journals keep regarding posting preprints on the Internet before these articles are submitted to them. I would like to know about policies kept in this regard by the commercial journals in the fields of physics, mechanics, and engineering (including software engineering, computational science and engineering, etc.).


Dibakar Datta's picture

Future Directions in Mechanics Research @ Brown University

Dear All,

            Welcome to the NSF workshop and Freund symposium at Brown University to celebrate pioneering contributions of Professor L.B.Freund on mechanics research.

           Date : June 1-3 , 2011

           Website (Under Construction) :

           For any help, please feel free to ask the Help Desk members. 

           We hope to see you at Brown University.

Ajit R. Jadhav's picture

What would you choose as the Top 5 Equations? Top 10?

Equations are of central importance in all of science and engineering, but especially so in mechanics.

Even leaving aside algebraic equations, handbooks on PDEs alone list hundreds of equations. However, a few of these do stand out, either because they encapsulate some fundamental aspect of physics/science/engg., or because they serve as simpler prototypes for more complex situtations, or simply because they are so complex as to be fascinating by themselves. There might be other considerations too... But the fact is, some equations really do stand out as compared to others.

Jianliang Xiao's picture

SES 2011, Minisymposium on Mechanics of Adhesion

Adhesion has long been an important issue for mechanics and many other disciplines. Its influence spans macro-, micro-, nano- and molecular scales. When size goes down, adhesion plays a more and more significant role. Many important technologies attribute to adhesion, such as transfer printing for advanced microfabrication,  super adhesives inspired by gecko foot hairs, and self-assembly. Adhesion also has strong implications on the behavior of nanomaterials (such as nanotubes and graphenes) and biological system (such as cells). This minisymposium "Mechanics of Adhesion" is to provide a forum of discussion and communication, for researchers working on and interested in adhesion related subjects.

Xuanhe Zhao's picture

Postdoctoral Position at Duke Soft Active Materials Laboratory

The Duke Soft Active Materials Laboratory directed by Prof Xuanhe Zhao is seeking a highly motivated postdoctoral fellow to study mechanics of polymers and hydrogels with applications in tissue regenerations. The work will be carried out in close collaboration with the Duke Orthopaedic Bioengineering Laboratory directed by Prof Farshid Guilak.

What do we do?

Yesterday, as I was waiting for the rain to stop before I could walk home from work, a stranger accosted me in the lobby of the building.  He asked me what I did, to which I replied "Mechanics".  He mulled over the answer for a bit and asked me to be more specific, at which point I said that we were trying to design materials that could guide waves around objects.  He said "Water waves?".  I replied "All types of waves."  Clearly, common words can mean quite different things to different people.

Libb Thims's picture

Statistical Mechanics of Humans

Boltzmann style gas particlesThis week I am working on a chronologically ordering of the 400+ thinkers of the past and present who have applied thermodynamics, whether chemical or statistical, to the humanities. In this group, germane to iMechanica, a few have specifically applied statistical mechanics to explain things such as crowd behavior, exchange of goods via money on small islands, traffic patterns, among numerous other order/disorder speculations on the microstates of society schemed on Boltzmann entropy models. I use the gas particle icon (adjacent) to distingish this group. Some of these mechanically-minded thinkers take years to discover, so I thought I would post a quick blog note here to stir up some possible discussion as to thinkers along these lines I might have missed in my list.

4th International Conference on Mechanics of Biomaterials and Tissues - Abstract Deadline 15th April 2011

This conference will take place in Hawai'i, USA, 11-14 December 2011

 Themes covered will include: 

meguid's picture

6th International Conference on Mechanics and Materials in Design



6th International Conference on Mechanics and Materials in Design

Ji Wang's picture

Faculty Positions at Department of Mechanics and Engineering Science, Ningbo University

The Department of Mechanics and Engineering Science, Ningbo University, China, has multiple openings in Solid Mechanics and Fluid Mechanics for experienced and junior applicants.

The Department has been supported by Zhejiang Province under Center for Excellence program for broad subjects related to Engineering Mechanics research and education.  We also have special funds for the enhancement of the Fluid Mechanics program.

More details on the current research and education program  of the Department can be found at


Applicants and inquiries should be addressed to 

Markus J. Buehler's picture

Special issue on "Computational and Theoretical Materiomics" now published (J. Computational &Theoretical Nanoscience)

The special issue on "Computational and Theoretical Materiomics: Properties of Biological and de novo Bioinspired Materials" has now been published. A list of papers is included below. A sincere thank you to all contributors! Anyone interested in a reprint of any of the articles please send me a message.

Ji Wang's picture

Faculty Positions at Piezoelectric Device Laboratory, Ningbo University

The Piezoelectric Device Laboratory has immediate opennings for recent PhDs.  We are engaged in researchs in piezoeelctric acoustic wave resonators with supports from government and indsutry.  The Laboratory has been grwoing and we would like to have new members to accelerate the pace and expand collaborations with the fast growing piezoelectric acoustic wave device industry in China and other countries.

We are looking for new PhDs with background in Solid Mechanics with experiences on theoretical and experimental work in acoustic waves, computational mechanics, piezoelectric materials, sensors, acutators, resonators, and applications.

Ajit R. Jadhav's picture

Use Only the Angular Quantities in Analysis? Three Sample Problems to Consider...

A recent discussion at iMechanica following my last post here [^] leads to this post. The context of that discussion is assumed here.

I present here three sample problems, thought of almost at random, just to see how the suggestions made by Jaydeep in the above post work out.

Ajit R. Jadhav's picture

Are Linear and Angular Momenta Interconvertible?

To the best of my knowledge, the two momentum conservation principles, namely, the conservation of linear- and angular-momentum, operate completely independent of each other. For an isolated object, there is no possibility of conversion of one form of momentum to the other.

Today, when I Googled on this topic, I found that most pages agree with my position above. Yet, to my great surprise, I did run into a page written by an engineer here [^] claiming that the linear momentum is only a special case of the angular momentum... Here is the relevant excerpt (bold emphasis mine):

Jianliang Xiao's picture

Materials and Mechanics for Stretchable Electronics

A review paper on stretchable electronics written by Professors John A. Rogers, Takao Someya, and Yonggang Huang was published in a recent issue of Science . This paper gives a nice summary on the recent advances in inorganic and organic stretchable electronics. Materials, structures and mechanics of these systems are discussed. Many attractive applications of stretchable electronics are introduced, such as stretchable silicon circuit, electronic eyeball camera, and flexible LED display. 

Here is the abstract of this review:

Jianliang Xiao's picture

Mechanics of in-surface buckling of one dimensional nanomaterials on elastomeric substrates

In this recently published paper on Nanotechnology, we studied the in-surface buckling mechanics of one dimensional nanomaterials on elastomeric substrates.  Simple analytical solutions are obtained for buckling wavelength and amplitude, which can be easily applied to the in-surface buckling of different nanomaterials, such as nanowires and nanotubes.  It is shown that in-surface buckling of nanomaterials has lower energy than out-of-surface buckling, which explains the experimental observance of in-surface buckling of silicon nanowires.  However, single-walled carbon nanotubes (SWNTs) are reported to buckle out-of-surface on PDMS substr

Ajit R. Jadhav's picture

An Urgent Appeal for Your Support of My Job Application at COEP's Mechanical Engineering Department

Dear iMechanicians,

I have applied for the job of "Associate Professor" in the Department of Mechanical Engineering at COEP, Pune, India [^]---the same place from where I did my PhD (Mech.) research.

I most earnestly make an appeal to you to provide me with an informal support for my job application by way of a brief email recommendation. My resume may be found here [^].

Jianliang Xiao's picture

In-surface Buckling of Silicon Nanowires on Elastomeric Substrates

Buckling of thin layers or aligned arrays of stiff materials on elastomeric substrates has many important applications, such as stretchable electronics, precision metrology and flexible optoelectronics.  These systems show one common phenomenon, the stiff thin layers buckle normal to the substrate surface (out-of-surface buckling).  By contrast, we recently reported for the first time that silicon nanowires (SiNWs) on elastomeric substrates buckle only within the substrate surface, i.e. in-surface buckling.  Experimental process to obtain buckled SiNWs is described.

Xiangfa Wu's picture

18th Annual International Conference on COMPOSITES/NANO ENGINEERING (ICCE -18), Anchorage, Alaska,USA, July 4-10, 2010

The Eighteenth Annual International Conference on
ICCE-18 Anchorage, Alaska,USA, July 4-10, 2010

Message from ICCE Chairman

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