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Dependence of relaxation time on the polymer length (via a string of viscoelastic springs)

Submitted by kongdong on

Dear all,



According to polymer theory, the relaxation time depends on its length (or unit number), and there exist some relationships to describe such dependence. The smaller number of polymer units, the smaller the relaxation time  of the polymer is. How to describe this via a simple model of visco-elastic springs?



Need some info about Mechanics and Control of Chatter Vibrations

Submitted by A.Vijay Alagappan on

Can anyone cite some resources for chatter vibrations...the google search results dont throw up good results...I need some thing that will explain the basics - mechanics,causes, measuring and control of chatter in machine tools!

iMechanica has over 16,000 registered users

Submitted by Zhigang Suo on

The number of registered users of iMechanica passed 16,000 early today.  The the number of posts passed 6,900, and that of comments, 12,500. 

iMechanica was founded in September, 2006, with the mission:

  1. to use the Internet to enhance communication among mechanicians
  2. to pave a way to evolve online all knowledge of mechanics

I quote what I wrote when the number of registered user passed 1000 in early 2007: