# blogs

Non-newtonian fluid is an interesting field.

## How do I resize my window for easier reading?

The Drupal software we use for iMechanica makes the blog posts very wide. It may be a little uncomfortable to read from the far left of the window to the far right. With a window so wide, it's easy to lose your place in the reading in moving to the next line of text.

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## es 246 project:plane strain extrusion- slip line field solution vs.FEM solution

hi Nanshu Lu,

i'm savita jain. i have project some what related to your topic. can i have results of your final coparision of slip line and FEM solutions.please let me know about any progress in your work.

## MATLAB Implementation of AVI

I work with AVI in my research so I have included a MATLAB implementation of AVI for the 1-D harmonic oscillator. The code will solve the equation a + gamma * v + (k1 + k2 + k3) x = 0 with any initial conditions x(0) and v(0). Here the spring constant has been artifically split into three spring constants to simulate multiple potentials. If there is only one potential AVI simplifies to the usual Velocity Verlet integrator. The friction term is absorbed into the k1 term in the implementation. The main idea in the implementation is to construct the propagation matrix for the system (x,v) for the different potentials.

## Poroelasticity references

Given the growing interest in poroelasticity within this forum, I thought I would post the link to "Poronet" -- the poromechanics internet resources network.  In particular, there is a nice long pdf chapter on the fundamentals of poroelasticity from Detournay and Cheng, 1993, which has become one of the standard references in the field.

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## Cycle Sequence of Fatigue Crack Initiation and Growth at the Submicron Scale

I recently used focused ion beam to fabricate some small structures, such as free-standing micro-beams, in LIGA Ni thin films and applied cyclic loads to those small micro-beams. In such a way, dynamics of fatigue crack initiation and growth can be revealed. Part of my results has been attached with this post.

## experimentally, stresses cannot be measured directly

Experimentally, loading to a mechanical system can be applied either through the displacement control or the force control.

However, the responses of the system can only be measured in displacements, and hence strains.

## Is Strain Gradient Elasticity Relevant for Nanotechnologies?

Determination of Strain Gradient Elasticity Constants for Various Metals, Semiconductors, Silica, Polymers and the (Ir) relevance for Nanotechnologies

Strain gradient elasticity is often considered to be a suitable alternative to size-independent classical elasticity to, at least partially, capture elastic size-effects at the nanoscale. In the attached pre-print, borrowing methods from statistical mechanics, we present mathematical derivations that relate the strain-gradient material constants to atomic displacement correlations in a molecular dynamics computational ensemble. Using the developed relations and numerical atomistic calculations, the dynamic strain gradient constants have been explicitly determined for some representative semiconductor, metallic, amorphous and polymeric materials. This method has the distinct advantage that amorphous materials can be tackled in a straightforward manner. For crystalline materials we also employ and compare results from both empirical and ab-initio based lattice dynamics. Apart from carrying out a systematic tabulation of the relevant material parameters for various materials, we also discuss certain subtleties of strain gradient elasticity, including: the paradox associated with the sign of the strain-gradient constants, physical reasons for low or high characteristic lengths scales associated with the strain-gradient constants, and finally the relevance (or the lack thereof) of strain-gradient elasticity for nanotechnologies.

## An interview with New World Times （新世界时报）

The following interview appeared in New World Times （新世界时报）on 23 February 2007.

（以下简称）：锁志刚教授您好！首先非常感谢您接受我的采访。我是从ISI科学论文引证系统知道您。2002年8月各个领域的统计中，论文引证最多的文章有你和（John Hutchinson）教授的论文。据统计您的论文当年被引用达三百多次，目前已经达到七百多次。您能否给我们一些关于您的背景介绍？

## Del.icio.us

Del.icio.us is a social bookmarking web service. One might say, why do I need del.icio.us if I have bookmarking capabilities built right into my browser? Well, here are some reasons:

• del.icio.us uses a non-hierarchical categorization system, that is, instead of organizing your bookmarks in folders, you assign tags to them.