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Bent F. Sørensen's picture

Time for registration for "Interface Design of Polymer Matrix Composites - Mechanics, Chemistry, Modelling and Manufacturing"

The programme for the 28th Risø International Symposium on Materials Science has now been finalized (see ).

 The Symposium is held at Risø National Laboratory, The Technical University of Denmark, 3-6 September 2007. 

 To sign up for the conference, please register up via the Symposium homepage:  


Henry Tan's picture

Forces and Newton's laws of motions

Newton's laws of motion

An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Carl T. Herakovich's picture

Dusan Krajcinovic has passed away

Dusan Krajcinovic, retired professor of mechanical and aerospace engineering at Arizona State University, passed away on August 10, 2007, after a long illness.  Dusan was active in the mechanics community.  In addition to his teaching and research activities, he was a past member and chair of the Applied Mechanics Divison of ASME.  He also served a term on the U. S. National Committee on Theoretical and Applied Mechanics. He authored the book Damage Mechanics published by North-Holland in 1996.  He will be missed by all those who knew him.

L. Roy Xu's picture

Power of iMechanica during job hunting

In July 2007, my friend of a consulting company contacted me for recruiting a computational mechanics engineer. I told him that all my graduate students found jobs, and there are not many mechanics students in our small department. So, I posted his ad at iMechanica. Only after one week, he asked me to withdraw this ad! Why?


Adrian S. J. Koh's picture

Size & Strain Rate MD Study on Metallic Nanowires

Thank you for your interest shown in my previously posted work.  Here's a post-print for an article of an extension to my previous work.  Extension in the sense that the MD simulation was performed on "larger" metallic nanowires (2.0 nm to 6.0 nm), and the behavior of gold (Au) nanowires were studied.  The mechanism behind strain-induced amorphization was explained and the phenomenon of multiple necking was observed, implying the presence of "localized" amorphization instead of a "globalized" one observed in shorter nanowires.

Nathan Wicks's picture

Structural Engineer Position at Schlumberger

See attachment for announcement of a Structural FEA Engineer position at Schlumberger's Sugar Land Product Center
 in Sugar Land, Texas.  If interested, please respond to Sepand Ossia (

Liying Jiang's picture

A cohesive law for carbon nanotube/polymer interfaces based on the van der Waals force

A cohesive law for carbon nanotube/polymer interfaces based on the van der Waals force (JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 54 (11): 2436-2452 NOV 2006)

Authors: Jiang, L.Y., Huang, Y., Jiang, H., Ravichandran, G., Gao, H., Hwang, K.C. and Liu, B. 

Mechanical threshold stress model for 6061-T6 aluminum

Our paper on the Mechanical threshold stress (MTS) model for 6061-T6 aluminum has been accepted by JoMMS.  There are several things of interest in the paper:

1) The use of a phonon drag model to predict the sharp increase in flow stress at strain rates above 10,000 /s.  This behavior is seen in a  number of materials and is hard to fit using standard power law plasticity models.  Our model does a good job in this regard.

shirangi's picture

Interfacial moisture diffusion using cohesive zone elements

Hello every body,

As most of you know, fracture mechanics of polymer materials needs a special consideration of the viscoelastic material properties. Especially under thermomechanical loading the role of glass transition temperature T_g is very important. That is why people try to characterize the material with different methods including stress relaxation based on Time-Temperature superposition or DMA test.

Naming the SI Unit for Fracture Toughness (KIC)

To: Engineers, Fracture Analysts, Mechanicians, Physicists...

In science and engineering, we have an excellent tradition: naming a physical unit using the name of a prominent personality from the concerned field. For example, in SI system, we measure force in newton, work in joule, power in watt...

But the unit of fracture toughness, i.e. KIC, is too lengthy to pronounce: (mega) pascal-underoot-meter. Further, it has also been in use for something like half a century by now, perhaps more. So, how do you like the idea of giving a name to this unit?

Zhigang Suo's picture

Essays and books on writing well

  • G. M. Whitesides, Writing a paper. Advanced Materials 15, 1375-1377, 2004.  This three-page essay by a prolific professor at Harvard advocates a process:  start writing a paper at the same time you start a research project.  Every thinking person should read this essay, and give the process a try.
Carl T. Herakovich's picture

Achenbach Receives National Medal of Science

Jan D. Achenbach, Walter P. Murphy Professor and McCormick School Distinguished Professor at Northwestern University was presented a 2005 National Medal of Science by President George W. Bush on July 27. Achenbach, who  is well known in the mechanics community, was honored for his seminal contributions to engineering research and education in the area of wave propagation in solids and for pioneering the field of quantitative non-destructive evaluation. Previously, Achenbach received a 2003 National medal of Technology from President Bush.

MichelleLOyen's picture

Mechanics in the news

Since I am an alum of the University of Minnesota, when I was a PhD student I lived only a few blocks from the site of yesterday's catastrophic bridge collapse in Minneapolis.  The statics analysis of a truss is almost the first thing learned by every undergraduate engineering student, and appears to be relevant here.  It is interesting to see words like "fatigue crack" and "vibrations" in the news .  In light of such events,

House Passes $600 Million Increase in National Science Foundation Budget

House Passes $600 Million Increase in National Science Foundation Budget July 27, 2007 --The U.S. House of Representatives passed an appropriations bill that would increase funding for the National Science Foundation (NSF) by nearly $600 million or 10 percent to $6.5 billion in fiscal year 2008.  The bill would put NSF on track to double its budget in less than 10 years.

The Batchelor Prize

Cambridge University Press and the Journal of Fluid Mechanics are delighted to announce the launch of The Batchelor Prize, sponsored by the Journal of Fluid Mechanics, to be awarded in recognition of outstanding research in fluid mechanics.

Demitris Kouris's picture

Faculty Position in Experimental Mechanics of Materials


Andrew Norris's picture

Sci & Engng Publication Output and the Research &Publication Environment in the US: NSF Reports

Within the last two weeks the US National Science Foundation (NSF) published not one but two studies on (a) the attitudes of scientists and engineers to the changing world of publication, and (b) the relative global productibity of US science & engineering as measured by journal publication.    

These are not dense 500 page reports, but short, readable (10-15 min.).  I think iMechanica readers will find them relevant and interesting:

Tips for short presentations

I've been to two conferences this year and I've again seen the same annoying features in many talks that have been warned against by numerous people over the years.

Here are some tips that might come in handy :


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