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Those were not waves: A bit historical re. Huygens' principle

Submitted by Ajit R. Jadhav on

A few points that might be of general interest:

1. The dates: The date of Huygens' first written down material, which was orally presented to the French Academy of Sciences, is 1678---in contrast to the oft-quoted date of 1690. 1690 was the year of the first, French, publication of these notes (plus other material) in the form of a book.

What are all the physical significance/meaning that can be obtained from a STIFFNESS MATRIX ?

Submitted by Anonymous (not verified) on

Hi everybody,

 Can any one explain what is the physical meaning that a stiffness matrix illustrate ? I am a learner at a starting level in this Finite Element Analysis field . There are some questions which I wish to get an idea upon ...

 1. What exactly Stiffness Matrix tells about the structure ? Can you please explain with an example like "Linear Timoshenko Beam or Bernoulli beam or like 4-node plane stress element"....

 2. What is the relation between the eigen values of a stiffness matrix and the corresponding rigid body modes ? 

Looking for a PhD student

Submitted by pschiavone on

I am a professor in the Department of Mechanical Engineering at the University of Alberta, Edmonton, Alberta, Canada. I am looking for a PhD student to work in the area of applied mathematics, specifically in solid mechanics (linear elasticity, complex variable methods, boundary integral equation methods) with a possible start date of Sept 2012 or jan 2013.

You can find out more details at:

www.mece.ualberta.ca/~schiavone/schiavon.htm

Modeling bond behavior between concrete and reinforcement bar - ABAQUS or LS-DYNA

Submitted by Manish Roy on

I am doing numerical simulation of bond behavior between concrete and reinforcement bar. I have to choose between two software, namely, ABAQUS and LS-DYNA. Can anybody suggest which software would be better for the simulation work?