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An observation on the experimental measurement of dislocation density

Submitted by Amit Acharya on
research
Plasticity
dislocations
EBSD
geometrically necessary dislocations

Amit Acharya and Robin J. Knops

(to appear in Journal of Elasticity)

The common practice of ignoring the elastic strain gradient in measurements of geometrically necessary dislocation (GND) density is critically examined. It is concluded that the practice may result in substantial errors. Our analysis points to the importance of spatial variations of the elastic strain field in relation to its magnitude in inferring estimates of dislocation density from measurements.

Is it possible to define a dimensionless number being capable of characterizing the two effects with totally opposite direction?

Submitted by Guanchu Cheng on
research
Normalization Method

1. assuming to exist a PDE describing an equilibrium along one direction (e.g., postive direction along X coordinate), A+B=0;

2. after normalization process to the above PDE, we got, A*+(C)B*=0;

3. (C)=B/A, is the dimensionless number, and obviously, (C) implicits that both two effects arising from A and B are the same in the direction, i.e., along the X positive coordanate;

Explanation Of Theory On Cam Follower Mechanism For Clean Energy.

Submitted by Jigar Y. Patel on
research
Clean energy cheaper than coal
multibody dynamics
cam follower clean energy
mechanical invention

I have made video For explanation of cam follower prototype for clean energy cheaper than coal. You can find more information about my prototype at http://mechanicalresearch.info/

 

Progress Report for International Journal of Applied Mechanics (IJAM)

Submitted by zishun liu on
research
IJAM; Journal

Dear All IJAM Contributors,

On behalf of Imperial College Press and the International Journal of Applied Mechanics (IJAM), I would like to take this opportunity on my best wishes to you and your families, wishing you a very good and Happy New Year!

Tetrahedron

Submitted by mohammedlamine on
research

 The Simplex K with 4 Vertices in Dimension 3 is a Tetrahedron and :

 K = determinant((x2-x1) , (x3-x2) , (x4-x3) ; (y2-y1) , (y3-y2) , (y4-y3) ; (z2-z1) , (z3-z2) , (z4-z3))

 The Volume of this element is :

 V(K) = abs(K) / 3! 

 If V(K) ~= 0  then K is Nearly Degenerated

 

 Moussaoui

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