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SUMMARY:Tristability\, simulations mode actuation\, and limit point behavi
 our in initially curved coupled micro beams - Dr Lior Medina\, CUED
DTSTART:20210212T160000Z
DTEND:20210212T170000Z
UID:TALK155662@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:Curved structures have been regarded as a benchmark problem fo
 r the study of nonlinear structures\, presenting a myriad of complex respo
 nses\, even more so when under the influence of nonlinear\, displacement-d
 ependent\, electrostatic load. Recently\, the focus has gravitated to two-
 dimensional structures such as plates and shells\, which added to the over
 all complexity of their analysis\, theoretically as well as experimentally
 \, while ensuing investigations as to their intrinsic stability behaviour 
 and potential applications. With the entrance of coupled structures into t
 he fold\, new insights have offered a glimpse to uncharted territories\, h
 eretofore unencountered\, where nonlinear phenomena are inherently pronoun
 ced or alternately\, controlled\, while presenting complex behaviour that 
 can even match two-dimensional structures. Among such phenomena is multi-s
 tability\, emanating from the coupling of two bistable constructs\, formin
 g a complex metastructure. Indeed\, multi-stability\, which has more than 
 two stable equilibria\, has been a highly sought-after property for a long
  time. The incentive for their study lies in their potential\, exemplified
  through applications which benefit from an increased number of values. Am
 ong such applications it is possible to name non-volatile mechanical memoi
 rs (NVMM)\, where a multi-valued element can lead to higher storage densit
 y\, allowing to store more date due to increased number of bits. However\,
  current studies have either produced structures too cumbersome for fabric
 ation on the one hand\, or too large (in the centimetre scale) on the othe
 r hand\, making it difficult to realise multi-stable applications in the m
 icroscale. In the current study\, a comprehensive and rigorous analysis is
  carried for a double beam metastrcutre via reduced order (RO) modelling\,
  arc-length “Riks” continuation method\, and multi degree-of-freedom (
 DOF) dynamics\, to characterise and disclose capabilities embodied in such
  a structure\, beyond bistability.\nOn the whole\, it is shown that while 
 such a structure may seem to be innocuous and simplistic at first glance\,
  it holds a vast range of intrinsic responses\, hitherto unknown\, from pa
 rallel mode actuation to several forms of tristability. By acquiring the a
 bility to transform such a structure to become bistable or tristable\, dep
 ending on defining parameters\, a whole new frontier of multistable based 
 applications can arise on the microscale\, while also providing a model th
 at can be used by engineers in the early design stages. In addition\, when
  taking into account the different multistable structures that were invest
 igated up until now\, it is also evident that the present study brings for
 th a relatively compact structure\, promoting the miniaturisation of vario
 us applications\, such as a three bit NVMM\, multi valued logical gate\, o
 r multi-acceleration threshold sensors.
LOCATION:Online - Teams.  Please email div-c@eng.cam.ac.uk for the link
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