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SUMMARY:How symmetries influence the flexibility of frameworks - Xin Liang
  - Structures PhD Student
DTSTART:20140530T140000Z
DTEND:20140530T143000Z
UID:TALK52829@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:Maxwell’s counting rule is traditionally used to decide the 
 degrees of freedom for bar-joint frames. However\, it has been observed so
 me structure frames with special geometries violate this rule. One typical
  example is the “locally isostatic” repetitive frameworks\, which are 
 those have the same number of constraints as degrees of freedom locally. 
 “Locally isostatic” frameworks in two dimensions are guaranteed to hav
 e one degree of freedom\, and have a finite kinematic path. However\, cert
 ain configurations have many more degrees of kinematic freedom – these a
 re often associated with high symmetry configurations. In this project\, w
 e are trying to investigate the reasons\, and find out how symmetries infl
 uence the flexibility of complicated frameworks. The possible applications
  include understanding the kinematics of complicated crystallographic stru
 ctures\, such as zeolites\, and explaining mysterious properties such as n
 egative thermal expansion coefficients.
LOCATION:Cambridge University Engineering Department\, LR3B
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