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SUMMARY:Resonant acoustic mixing processing studies of energetic materials
  - Andrew Claydon\, Fracture and Shock Physics Group\, Cavendish Laborator
 y
DTSTART:20221020T140000Z
DTEND:20221020T150000Z
UID:TALK177431@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Join on your computer\, mobile app or room device\n"Click here
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 eeting_OTYxMDAzZTctOTIyOS00MjFjLTkyYTQtYWU5NWQ0OGYxMTMx%40thread.v2/0?cont
 ext=%7b%22Tid%22%3a%2249a50445-bdfa-4b79-ade3-547b4f3986e9%22%2c%22Oid%22%
 3a%227c6a2f02-88b3-4342-87da-b62dd7126ff0%22%7d\nMeeting ID: 394 909 515 6
 55 \nPasscode: jpqqaf\n\nAn investigation into how the efficiency (time an
 d energy required for homogeneity) of Resonant Acoustic Mixing (RAM) can b
 e determined and optimised was undertaken. An idealised Polymer Bonded eXp
 losive (PBX) simulant based on glass microbeads (28.3 µm D50\, 62 % v/v i
 n binder and plasticiser) was used for mixing. Mixing evolution was monito
 red using machine output data\, whereby the mixer 'intensity' (related to 
 power draw) was plotted against time. Experiments were undertaken with thr
 ee acceleration settings\, two mixer units\, and three vessel materials of
  low\, medium\, and high surface free energy. Different stages of the mixe
 r 'intensity' profiles were found to correspond to discrete stages of mixi
 ng\, as well as further rheological changes due to continued frictional he
 ating\, thus viscosity reduction\, beyond homogeneity being achieved. Time
  to mixing completion was found to be repeatable within a standard deviati
 on of ±10 %\, strongly dependant on acceleration setting\, and additional
 ly dependant on vessel material\, though additional data is required to co
 nfirm this. A significant difference in mixing time was observed between d
 ifferent LabRAM units. Partial vacuum application without degassing was be
 neficial for mixing. Finally\, a paradigm linking the 'movement modes' of 
 mixing was constructed\, based on literature observations and the experime
 ntal results. 
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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