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stable elements for mixed elasticity

Submitted by Alessio on
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I'm very interested in the choice of the finite element spaces for elasticity. I want to choose elements for the stress and the velocity, I was suggested to use piecewise constant for the stress and piecewise linear for the velocities to satisfy the Babuska-Brezzi condition. Is that right? I've heard that I can't use only 6 components for the stress in this way, but I must add some additional constraint to enforce its simmetry. I'm looking for additional documentation, but I can't find any. Has someone got any suggestion? Thanks.

What's Your Problem?

Submitted by Martin Pratt on

Rather than scratching heads when faced with a seemingly impossible contradiction in a job, engineers could do worse than apply the Triz theory.

There has been quite a buzz around Triz, the Russian theory of problem solving, for some time. Since it was fully refined in the mid-1980s its use has been slowly spreading as word gets round, much like the increasing popularity of a political movement.

Subject Guides from the IMechE

Submitted by Martin Pratt on

In order to try and get some of the vast store of engineering information we're sitting on out to a wider audience we've created a number of occasional subject guides for engineers and students. The aim is to highlight sources of information available from our Library and the Institution itself.

You can see an example of one of these (for the aerospace industry) here, from which you can browse to a whole host of others.

Relationship between Hardness and Elastic modulus?

Submitted by Anonymous (not verified) on

What is the relationship between hardness and elastic modulus? The higher hardness, the higher elastic modulus?  My understanding is that hardness is a local mechanical property, and 
elastic modulus is an averaged global mechanical property.  Am I right about this? 

Free Online Access to latest Mathematics and Mechanics research until November 30, 2007

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As a courtesy to mechanical professionals and academics at large, I would like to inform you about the current free access period to mechanical research including the following journals:

Journal of Damage Mechanics

Mathematics and Mechanics of Solids

From now until November 30, 2007, you can access any materials science, mechanics or engineering journals online (from volume 1, issue 1 to current) free of charge!