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Cam Follower Mechanism and energy efficiency

Submitted by Jigar Y. Patel on

You can see practical model of cam follower mechanism for clean energy.
Follower move little bit and help cam to rotate 6 times more peripheral
length. Cam can rotate 360 degree using two followers. You can get full
research at my blog at

http://energyefficientmechanism.blogspot.in/2009/04/mechanism-to-increa…

 

 

 

First order linear system

Submitted by D Rabinovich on

A linear (hyperbolic) first-order system has to be solved using Finite Elements.

As I understand usually non-standard discretizations are used in this case (Discontinuous Galerkin for example).

What is the reason for this? Can such an equation be modeled using standard Galerkin methods (say, linear finite elements)? 

Would standard Galerkin discretization cause instability of the solution?

Thanks,

Daniel

Spring stiffness of a helical spring

Submitted by Biswajit Banerjee on

Once in a while I have to find the stiffness of a spring that I get from the local hardware shop.  I usually use a formula that can be found in some books on mechanics of materials.

But the assumptions bother me a bit because the springs that I used usually underwent large deformations and I wasn't sure whether the numbers I was using were correct or not.  

To check the formula I compared its predicted k to numbers from Abaqus simulations and found reasonably good results for many situations - but not for soft springs.

Fracture and contact mechanics for interface problems: a special issue of EFM

Submitted by marco.paggi on

A Special Issue of Engineering Fracture Mechanics

on

"Fracture and contact mechanics for interface problems", edited by Marco Paggi, Alberto Carpinteri and Peter Wriggers has just been published:

http://www.sciencedirect.com/science/journal/00137944/80

The selected articles were presented in a Minisymposium of the IV European Conference on Computational Mechanics, Paris, France, 2010.

 

Giant, voltage-actuated deformation of a dielectric elastomer under dead load

Submitted by Jiangshui Huang on

Far greater voltage-actuated deformation is achievable for a dielectric elastomer under equal-biaxial dead load than under rigid constraint usually employed. Areal strains of 488% are demonstrated. The dead load suppresses electric breakdown, enabling the elastomer to survive the snap-through electromechanical instability. The breakdown voltage is found to increase with the voltage ramp rate. A nonlinear model for viscoelastic dielectric elastomers is developed and shown to be consistent with the experimental observations. 

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