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In situ observation of dislocation nucleation and escape in a submicrometre Al single crystal

Submitted by Daniel Kiener on
research
nanomechanics; plasticity; dislocation dynamics; in-situ TEM

Dear colleagues,

Experimental nanomechanics is a frequently discussed topic on imechanica, see e.g. the very active monthly topics by Xiaodong Li, Julia Greer and Wei Cai.

Continuing on this, I would like to draw your attention to a paper we recently published:

"In situ observation of dislocation nucleation and escape in a submicrometre aluminium single crystal" by Sang Ho Oh, Marc Legros, Daniel Kiener & Gerhard Dehm (http://www.nature.com/nmat/journal/v8/n2/abs/nmat2370.html).

Howard Stone elected to the National Academy of Engineering

Submitted by Anonymous (not verified) on
mechanician

Howard A. Stone, of Harvard University, is elected to the National Academy of Engineering, for the development of fundamental concepts and novel applications in microfluidics and for improving the understanding of small-scale, viscous-flow phenomena.  Here is the full list of members elected in 2009.

Importing Patran neutral file in to Ansys

Submitted by Zahra Zabolizadeh on
research

I imported the Patran neutral file (with *.out) in to Ansys(for a plate with a hole which was generated in the IDL and was imported in to the Patran) . but just the geometry of plate imported and i had not any elements, nodes (any mesh), and it reported in the Ansys. I also tried "import mesh " and nothing happend. could you please let me know what should I do?

How to choose what kind of element for particular problem (2D plane stress element or 3D solid element)?

Submitted by itbitb on
How to choose what kind of element for particular problem (2D plane stress element or 3D solid element)?

Dear all,

 

I would like to ask expert FEM users that how can we choose what kind of element for particular problem? Such as a plate (thickness t = 2.5 mm, W = 15 mm, L = 64 mm) subjected to axial tensile loading of cyclic loading, I should choose 2D plane stress element or 3D solid element?

 

It is really appreciated for all suggestions.

 

Kind regards,

 

Anh 

Ansys - Concrete nonlinear beam

Submitted by Guillaume Gondre on
software
Concrete nonlinear beam

Hello,

I have to model with the Ansys software a beam in concrete material. It must be non linear.

In materials properties, I can choose Materials models - Structural - nonlinear - inelastic - non metal plasticity - concrete.

I put the Elastic Modulus, the Poisson´ratio, the uniaxial cracking stress and the uniaxial crushing stress. But I don´t know how I can enter the values of the strain at fc (compressive cylinder strength) and the value of the fracture energy.

comment

Submitted by curious reader on

 

 

 

I have glanced through both messages: "About: why....." and "The reasons of...." And was surprised: there are hundreds of readers but no one comments. What happened? Are there a lot of cheap energy - isn't a problem? And good diamonds aren't interesting?

May be this magazine read only simple people, and serious scientists and engineers are ignoring it?

It's a pity; this topics aren't empty; if the author writes nonsense, clever people must show on it.

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