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Mike Ciavarella's picture

Wikipedia on H-index ---- another excellent article, and also very interesting!

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This article is about the index of scientific research impact. For the economic measure, see Herfindahl index.

Uncertainty quantification in mechanics

Modern composite structures have a wide spread in their failure stress.  Advanced multiphysics codes can have a wide range of predicted behavior for nominally the same inputs.  How do we certify the design of such structures or the accuracy of such codes?

Mike Ciavarella's picture

Beyond nanoscales...

My friend Pugno is speculating beyond the nanomaterial strength.

 

Questions about dislocation souce

As our body, we birth, grow up and dead? Wil the dislocation souce be the same process, if it’s so, what’s the detail process.

(1):the birth of dislocation source

Sample postdoc research proposals, please !!!

Hi all,

It is very good to see postdoc jobs posted in imechanica .I want to apply for postdoc position in solid mechanics ,however, i have never written a postdoc research proposal.I dont know how it is different from statement of purpose that is required for a graduate research. 

I tried but could not find any sample postdoc research proposal on internet.

I would greatly help if anyone can send me his/her actual or sample postdoc research proposal 

Thanks and Regards,

Sonia Chopra 

On designing dielectric elastomer actuators

Subject to a voltage, a dielectric elastomer can deform substantially, making it a desirable material for actuators. Designing such an actuator, however, has been challenging due to nonlinear equations of state, as well as multiple modes of failure, parameters of design, and measures of performance. This paper explores these issues, using a spring-roll actuator as an example.

Mike Ciavarella's picture

Viagra and Mechanics --- Watermelon May Have Viagra-effect

I was reading this research from A&M Texas on Viagra and Watermelon. 

http://www.sciencedaily.com/releases/2008/06/080630165707.htm

I have noticed that it has made the front page news on many newspapers
worldwide in a matter of few days.  Maybe we should move to this field,
and because below I find that there are indeed interaction with aorta stiffness and elastic wave reflections.

Ken P. Chong's picture

STC FY2008 solicitation has cleared

Plans are underway to issue a solicitation for the Science and Technology Centers Program in July 2008. Please visit the STC website for updates: http://www.nsf.gov/od/oia/programs/stc/index.jsp

Mike Ciavarella's picture

PlosONE publishes secret of Stradivari violins in wood density

Research Article

Formal Correction: This article has been formally corrected to address the following errors.

How to develope a new potential function.

How to develope a new potential function.

For instance, if I want to study a new material system by classical MD, for which the existing potential force fields are not suitable.

I would like to know the standard procedure, how to use the first principle studies/ experimental data and how to select the basic functions...from the experts in this area.

Prasad MVD

User Element for muscle model, with static condensation

Hi all

 

I am in the process of developing my first user element in Abaqus, and finding it rather difficult. 

The
application requires modelling muscle behaviour. Hence a spring model
(linear at this stage) with 3 elements: 2 in series with each other,
and these 2, parallel to the third was implemented.

My problem involves static condensation of the stiffness matrix. (similar to mixed-methods)

Any advice/assistance would be great. Especially with regard to development of the user element in Abaqus.

 

Thermostating only a few atoms in MD

I am trying to apply Berendsen thermostat for CNT. When I choose to leave one third of the tube atoms to evolve freely with out distrubing the momentum, I am unable to acheive the target temperature and further temperature increases gradually over the whole simulation run (even with a thermostat parameter equals to the timestep i.e., like a simple scaling). How it is possible to acheive target temperature,by scaling only a part of atoms, using some scaling value which should actually scales all the atoms momenta.

Mike Ciavarella's picture

Science 2.0: Great New Tool, or Great Risk?

Welcome to a Scientific American experiment in "networked
journalism," in which readers—you—get to collaborate with the author to
give a story its final form.

http://www.sciam.com/article.cfm?id=science-2-point-0-great-new-tool-or-...

 

Review papers

One of the most important things every researcher does in the beginning of his introduction to a topic is review process. Most helpful papers in this regard are review papers. Review papers are important. They are primary and best way to understand the value of a work for the societyto award and grant. They help researchers to find out needs of people who use our research and goal functions of scientific society. Help researchers to find out good topics and also good solutions. And the final effect of a research on the society.

Modeling polyurethane

I've started to look into the modeling of polyurethane.  So far I'v found one paper that specifically looks into how to model the mechanical behavior of PU. It describes a possible constitutive model for PU:

Stress-strain behavior of thermoplastic polyurethanes, Qi,H.J.; Boyce, M.C., Mech. Mater. 2005, 37, 8, 817-839

Does someone know of any other resources on the modeling of PU?  Thanks, Andreas

Steffen Brinckmann's picture

Elastic deformation of substrate due to rotation of rigid pillar

Consider a ridig pillar ontop of a elastic substrate. Applying a moment to the pillar will lead to elastic deformation of the substrate. If the pillar is infinitly large in diameter, then this problem is the same as an infinitely sharp crack, considering the symmetry of the crack problem, i.e. there are square root singularities. However, the infinitly large diameter assumtion does not hold if the global rotation of the substrate under the pillar is of interest, because the both sides of the pillar interact.

Mike Ciavarella's picture

Engineering Happiness

dear imechanica friends

   the Grand challenges  for Engineering make clear that we should work for the good of our Society.  So, how much of technology really makes are happier?

I need help with ABACUS MODELLING

Hello there, I need your help if you can please email me as i can not log into imechanica all the time to check my blogs because the website jams most of the time ,i will appreciate your help.

I need to draw a normal rectangle using abacus and then mesh it and apply force on it and to be as beam???

i tried to do it but i keep getting an error message saying 4 elements have missing property definitions???

If any one can help this is My email is nl1422@hotmail.com

Thank you so much.

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