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Cai Wei's picture

Journal Club Theme of November 2014: Catalyzed Growth of Semiconductor Nanowires - Multiscale Models

Introduction

Happy Halloween!

In this issue of the Journal Club, I would like to introduce the problem of catalyzed growth of semiconductor nanowires and ways to model it.  I would provide web links to only a few articles, hoping that you would download and actually read them so that we can have a more in-depth discussion. 

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Abaqus Unit Consistency (micrometer)

Hi All,

Am confused, and messy with a very basic thing, Units! I am modelling spherical with radius in micro-meters (1m~10^6 u m). The shear stress and pressure , in the problem is given in Pascals (N/m^2), 414 and 890 Pascals respectively. What will be my values for them in Abaqus, if units are to be consistent. Please help and thanks in advance my fellow bright researchers.

P M G B A

 

Orthotropic plane strain & plane stress Constitutive matrix for micropolar elastic media

Hi all, 

     Could anyone please help me  finding the constitutive matrix for orthotropic plane strain and plane stress in cosserat elastic continua ?  I have done searches with micropolar orthotropic 2D , cosserat orthotropic 2D/ Plane strain etc. But couldnot get it. 

Also, what all changes one should make if I try extending the orthotropic elastic plane strain and plane stress constitutive relations for classical mechanics to the micropolar media? 

Thanks in advance,

Nizanth

Pradeep Sharma's picture

Reminder (Deadline, Dec 5th): Call for Nominations for the Eshelby Mechanics Award for Young Faculty

It is my pleasure to solicit nominations for the "Eshelby Mechanics Award for Young Faculty". This award, launched in 2012, is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. While interdisciplinary work that bridges mechanics with physics, chemistry, biology and other disciplines is encouraged, the ideal awardee will demonstrate clear inspiration from mechanics in his/her research.

Aifantis International Symposium 2015 October - Antalya, Turkey

Dear Colleague,
We are sending you this message to let you know that the Aifantis International Symposium, dedicated to the life time achievements of Prof. Elias C. Aifantis, Emeritus Professor, Michigan Technological University, Houghton, USA and Honorary Professor, Aristotle University, Thessaloniki, Greece, will be held from 4-9 October 2015 in Antalya, Turkey.

Expectation of higher order moment (Bayesian Stats)

I am taking a course in Bayesian statistics, which is off my field. In the lecture notes, the instructor showed

E[X^2n] = (2n-1) σ^2n

and E[X^3 . Y] = E[Y^3 . X] = 3.ρ.σ^4  

where  σ = variance

E = expectation

X is a random variable.

ρ = cor(XY) = E[XY]/σ^2

Can anyone kindly explain how these equations were derived or atleast point me towards some text where I can understand this? Is this to do with the moment generating function?

XFEM in LS-DYNA

Hello,

Can anyone help me with some examples of XFEM implementation in LS-DYNA? Also, is XFEM in LS-DYNA currently applicable with shell elements only?

Thank you,

Prathyush

Wenbin Yu's picture

cdmHUB.org: Online Composites Community of the Future

I thought this might be of interest for some imechanicans, particularly those who work on composites (anisotropic and/or heterogeneous materials). Sorry if it sounds a bit infomercial. 

Imagine a youtube-like environment for you to deploy a cloud version of your code without any change to your original code. Your research code can be immediately shared with the global community. 

Behrooz Karami's picture

Computationally based Reduction of Dimensions of a Study

Dear All,

Just wondering how the dimensions of a scientific topic can be reducued just by using computatinal tools?

Where does lie its value and what would be the challenges? Any examples?

All the best,

Behrooz

Full Professorship on Computational Continuum Mechanics

open position: Full Professorship on Computational Continuum Mechanics at the Faculty of Civil and Environmental Engineering, University of Stuttgart, Germany

saberelarem's picture

PhD Research Projects offered for 2015

ParisTech Doctoral Institute and ParisTech local branch in China have launched a coordinated recruitment procedure in the framework of an agreement with the China Scholarship Council (CSC). This program is open to highly qualified Chinese students interested in carrying on doctoral training at ParisTech with financial support of the CSC.

http://paristech-china.com/content/phd-grant-china-scholarship-council

differentiation of Strain energy Function

Dear,
I am having problem to find "Cauchy stress(σ) " and " Spatial elastic Tensor (c)" from the "strain energy function (ψ)" using 2nd Piola Kirchhoff stress ( S) of transversely isotropic hyper-elastic material. as per the Mechanics the 

Speech of Acceptance of the 2014 Timoshenko Medal by Robert M. McMeeking

Applied Mechanics Division Banquet, Palais des congrès de Montréal, Quebec, Canada, November 18th, 2014.

Now I can say whatever I like in my Timoshenko Lecture and it won’t matter – because you will only remember Ken Liechti playing the bagpipes and, perhaps, the kilts.  Thank you Ken.

Modelling cartilage using Hyperelastic+Permeability in ABAQUS

Hi,

I am modeling a contact problem. I have chosen Hyperelasticity+permeabilty for catilage material. I apply a displacement over a short time and fix it over a long time to see the force relaxation procedure. during loading time we assume that the boundries ar impermeable but over long time are permeable.

there are some questions that I'm facing with:

1) Shall I use one step and put permeable Boundaries?

Postdoctoral Research Position in Structural-Scale Life Prediction of Aero-Structures Experiencing Combined Extreme Environments

The objectives of this project are to develop methods to probabilistically predict the life of aero-structures subjected to combined extreme environmentsand also to quantify confidence in the predicted margins of safety on the life.

MMAEatIIT's picture

Illinois Institute of Technology - Mechanical, Materials and Aerospace Engineering Department - Multiple Faculty Positions

Applications are invited for multiple tenure-track faculty positions at the assistant or associate professor level. The MMAE Department at IIT is seeking candidates with interdisciplinary research interests contributing to one or more of the department’s areas of strategic research emphasis, which include (1) mechanical design, (2) digital manufacturing, (3) computational materials science and engineering, or other research areas that enable strong collaborations.

Marginal Probability Density Function of Stochastic Process

I was solving the following question and I derived the Auto correlation function and proved that it is a WSS process. However, I am not sure how to go about finding the Marginal probability density function. Should I find joint probability of a and b and then find marginal probability of each random variable?

Limitations of using Reliability, Availability & Maintainability software applications for engineering asset management

Does anyone have experience in using RAMs software applications?

I am working on a paper that looks at the limitations of managing risk and improving reliability of engineering assets by using RAMs software applications but I have no experience in using any RAMs software application.

Carnegie Mellon University Department of Civil and Environmental Engineering

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Ettore Barbieri's picture

Extended deadline for abstract submission ESMC2015 "Micro and Nano Mechanics"

Fellow iMechanicians,

the deadline for submission for the next European Solid Mechanics Conference has been extended to the 30th November.

The conference will be the "place-to-be" next year in the Solid Mechanics community, with a truly outstanding line-up for the plenary lectures.

In particular, I am co-organizing with Nicola Pugno a mini-symposium on Micro and Nano Mechanics

http://www.esmc2015.org/_medien/_content/pdf/NicolaPugno_EttoreBarbieri.pdf

Helical Strand Mechanics Modelling

Some 2014 papers on the mechanics of helical strands: cables and electrical conductors

Converged, but to the right solution??

Hello eveybody,

I am confused in using numerical schemes: What can convergence of a numerical scheme tell us and what not??? lets assume that a numerical scheme does converge to "A result" or "A number", but how could we be sure that the scheme has actually converged to the "RIGHT solution" and not a WRONG one??

Any input is appreciated!

Setareh

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