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New paper: Cloaking of matter waves under the global Aharonov-Bohm effect

Cloaking of matter waves under the global Aharonov-Bohm effect

Authors

De-Hone Lin and Pi-Gang Luan

Abstract

Obesco Gad's picture

Elastic-Perfectly Plastic in Abaqus Explicit

Dear Mechanical Engineers,

It's my pleasure to be one of your group. I have a question in Abaqus Explicit and all my friends recommended me to as iMechanica as the explicit Abaqus is more popular to you than us as civil engineers.

I’m trying to simulate a tensile test for an elastic-perfectly plastic material as a quasi-static analysis in Abaqus Explicit. I have solved the same problem in Abaqus Standard and the results were fine as follow.

Nonlinear oscillation of a dielectric elastomer balloon

This paper studies the dynamic behavior of a dielectric elastomer balloon subject to a combination of pressure and voltage.  When the pressure and voltage are static, the balloon may reach a state of equilibrium.  We determine the stability of the state of equilibrium, and calculate the natural frequency of the small-amplitude oscillation around the state of equilibrium.  When the voltage is sinusoidal, the balloon resonates at multiple frequencies of excitation, giving rise to superharmonic, harmonic, and subharmonic responses.  Whe

Xuxin_Tu's picture

geomechanics @ Northwestern featured in LiveScience

 

http://www.livescience.com/environment/090527-science-lives-andrade.html

LiveScience is a pretty cool initiative targeted to the general public,
specially the younger generations to communicate the impact and
value of science and the people around it.

Adrian S. J. Koh's picture

Maximal energy that can be converted by a Dielectric Elastomer Generator

Mechanical energy can be converted to electrical energy by using a dielectric elastomer generator.  The elastomer is susceptible to various modes of failure, including electrical breakdown, electromechanical instability, loss of tension, and rupture by stretch.  The modes of failure define a cycle of maximal energy that can be converted.  This cycle is represented on planes of work-conjugate coordinates, and may be used to guide the design of practical cycles.

Looking for a PhD Position in welding Engineering

I did my Master in Material Science from IIT Roorkee in year 2007. Worked on GMAW of steel to aluminum joint in ISF, Aachen University, Germany under DAAD fellowship. Joined in Tata Steel Research and Development Division, India. Working in the field of Welding and Joining. Work on Adhesive Bonding and Weld Bonding of Advanced High Strength Steel sheets for automobilr. Now working on MIG-Brazing of High Strength GA steel sheets for automobile and also work on Friction Stir Welding of EIF steel to steel and EIF steel to Aluminum alloy sheets. Now looking for a PhD position preferably in Europe to do research in Welding Area.

Abaqus 3D model and 2D meshed cross-sections

I have a 3D model in Abaqus of a wind turbine rotor, modelled with shell elements (S4R and S3). To use the same blade in an aeroelastic wind turbine code (HAWC2 from Risoe), I want to convert selected cross sections of the 3D model to Timoshenko beam elements.

Coupling Abaqus with an aeroedynamic code - PART 2

In a previous post some months ago (see here), I mentioned some of the questions I had considering the aeroelastic response of a wind turbine rotor. In this post I just want to give, for those interested, a brief status report.

Gibbs free energy and constitutive equations

I don't know if my understanding of the following is correct, so I would appreciate your comments. I have an expression for Gibbs free energy of a material G=G(σ,T,...). Is it correct to derive the equation for strain as ε=∂G/∂σ ?

Composite plate analysis using ansys. coding using matlab

hi friends,

 

 I  have coded for laminate  using matlab. for further analysis i want  code for composite plate simply supported at all 4 edges. 

 then analyse with ANSYS. and use optimization techniques for optimizing the plate.

material : Graphite /eposy

thickness of each lamina : 0.127

Seq [45 0 -45]

 

Please anybody know how to code for composite plate and do stress analysis using Ansys.

feel free to share ur thoughts 

soil modeling

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My name is Bash Phd  in colorado school of mines and I am newbie in soil modeling  and I just started my PhD study  months ago. I am experimentally and numerically studying the stress distribution undernath the padfoot roller at the first stage, I need to have a constitutive model for soil with both dilatancy and hardening behaviors.

zishun liu's picture

International Journal of Applied Mechanics (IJAM) Vol.1 No.2

Dear Colleagues:
I am pleased to inform you that the papers to be published in International Journal of Applied Mechanics (IJAM) Vol.1 No.2 will be online available soon.

IJAM Vol.1 No.2:
1.  “Postbuckling Of Nano Rods/Tubes Based On Nonlocal Beam Theory”, C. M. Wang (National University of Singapore); Y. Xiang (University of Western Sydney); S. Kitipornchai (City University of Hong Kong).

Fracture Mechanics vs. Damage Mechanics

I was wondering what are the advantages of damage mechanics and fracture mechanics over each other? Specially in order to model the delamination phenomenon.

please help for postbuckling analysis in ANSYS

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Free Tags: 

I am trying to perform postbuckling analysis of plates in ANSYS. But something confuses my mind. After linear buckling analysis I use scaled firtst buckling mode shape to generate initial imperfections. Then I initiate nonlinear geometric analysis by NLGEOM command. Collapse load or final converged iteration changes according to NSUBST option. I am trying to give higher Substep to obtain more sensitive and reliable results like 10000. But NSUBST with 100 sometimes reaches higher loads than using 10000. Which one is a correct approach?

Could anyone help me?

In search of articles on mesoscale FE modeling of sintering

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Hi. I'm now starting my PhD on a project on sintering of hard metal.

I'm doing a literature study, but I have failed to find any articles that uses FE analysis on the micro/mesoscale. All of them seems to handle this only with a homogenized model on the macroscale.
If I get to be picky, I would prefer something with hardmetal, but at this point, anything would be great.
I would also be very happy to find any suitable reading on FE-analysis on solid-liquid-pore mixtures.

eforoozmehr's picture

Looking for a postdoc on Laser Material Processing

I am already PhD candidate of Mechanical Engineering in Southern Methodist University, Dallas, Texas. I am looking for a postdoc position with an emphasis on laser material processing. You may access my CV by:

http://lyle.smu.edu/~eforoozmeh/CV.htm

 

Failure Surface Graphics in Stress Space

 A new section has been added to the website on failure criteria for engineering materials.  This new work displays many different three-dimensional computer graphics of failure criteria surfaces in stress space. The full range of isotropic materials are covered from ductile metals to brittle ceramics and glasses and beyond.  All of these computer generated graphics can be seen at www.failurecriteria.com/failuresurfacegr.html.

 

abaqus vumat-excessive distortion

Hi All

I am trying to implement a composite material model in vumat. So far, I
have been successful in getting the correct results for a cube for both
tension and compression with the cube being modeled with just one
element (C3D8R)

But when, i model the same cube (side 40mm) with 125 elements,
subjected to the same bc's, with the same material parameters, i get an
error that the element is undergoing excessive distortion.

I am specifying a density of 1.52e-9 ton/mm3.

MLPG

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Hello, my MS thesis is development of MLPG to special plate problems,

I would be glad if you, dear friend, can help me by source code writen in MATLAB (even beam problems).

Thanks.

Arash_Kheradvar's picture

Effect of Fiber Geometry on Pulsatile Pumping and Energy Expenditure

Myocardial fiber orientation is a topic that has recently received much attention in connection with cardiac pumping function. The twisting motion of the cardiac base to apex can be a direct result of this geometric orientation of these fibers. One important question that has not been addressed yet is whether there is any relationship between the contractile energy expenditure and the geometric orientation of myocardial fibers. In the present work, we study the effect of contractile fiber orientation on pumping function.

The sudden throws of rock, coal and gas in the mines

 

 

                           The sudden throws of rock, coal and gas in the mines                      

  • - the natural manifestation of the active shock waves of stretching

 

Qiang Chen's picture

dynamic bending stress analysis in sandwich thin film structure

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Hello,

Does anybody know if there exists an analytical solution for stress distribution in a sandwich like/ multilayered thin films subjected to cyclic bending? The sandwich has line-patterned metal of submicrons in thick and a few microns in width, which was coated/deposited by other material on top and bottom (surrounding as well) with different thickness up to 20 microns.

 

Nanshu Lu's picture

Singular stress fields at corners in flip-chip packages

An electronic device integrates diverse materials, and inevitably contains sharp features, such as interfaces and corners. When the device is subject to thermal and mechanical loads, the corners develop intense stress and are vulnerable sites to initiate failure. This paper analyzes stress fields at corners in flip-chip packages. The stress at a corner is a linear superposition of two modes of singular fields, with one mode being more singular than the other. The amplitudes of the two modes are represented by two stress intensity factors of dissimilar dimensions.

phd in mechanical eng

Dear Sir.

Greetings!

 

 

I believe my strong academic background, personal initiative, and work experience would be an asset to my Future research work and also for my Dream career. As indicated in my resume, I have Sound knowledge in Modeling and Analysis Packages, Auto CAD, Pro-Engineer wild fire, Pro-Mechanica & ANSYS

 

 

Ken P. Chong's picture

MRI-R2 has been posted

The NSF Major Research Instrumentation Program (MRI-R²) Recovery and Reinvestment is now posted. This is a good way to build up the needed major research instrumentation

The deadline for proposals will be August 10, 2009.

A link can be found through the page www.nsf.gov/od/oia/programs/mri (preferred to keep abreast of updates) or through the NSF-wide page at http://www.nsf.gov/funding/pgm_summ.jsp?pims_id=5260.

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