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CATEGORIES:Engineering Department Structures Research Seminar
 s
SUMMARY:How symmetries influence the flexibility of framew
 orks - Xin Liang - Structures PhD Student
DTSTART;TZID=Europe/London:20140530T150000
DTEND;TZID=Europe/London:20140530T153000
UID:TALK52829AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/52829
DESCRIPTION:Maxwell’s counting rule is traditionally used to d
 ecide the degrees of freedom for bar-joint frames.
  However\, it has been observed some structure fra
 mes with special geometries violate this rule. One
  typical example is the “locally isostatic” repeti
 tive frameworks\, which are those have the same nu
 mber of constraints as degrees of freedom locally.
  “Locally isostatic” frameworks in two dimensions 
 are guaranteed to have one degree of freedom\, and
  have a finite kinematic path. However\, certain c
 onfigurations have many more degrees of kinematic 
 freedom – these are often associated with high sym
 metry configurations. In this project\, we are try
 ing to investigate the reasons\, and find out how 
 symmetries influence the flexibility of complicate
 d frameworks. The possible applications include un
 derstanding the kinematics of complicated crystall
 ographic structures\, such as zeolites\, and expla
 ining mysterious properties such as negative therm
 al expansion coefficients.
LOCATION:Cambridge University Engineering Department\, LR3B
CONTACT:Lorna Everett
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