BEGIN:VCALENDAR
PRODID:-//Columba Systems Ltd//NONSGML CPNG/SpringViewer/ICal Output/3.3-
 M3//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20190930T095531Z
DTSTART:20191023T130000Z
DTEND:20191023T135000Z
SUMMARY:Claire McIlroy - Modelling Extrusion-Based 3D Printing of Entangl
 ed Polymers
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}vhk-k0fezwu
 s-173cc1
DESCRIPTION:Claire McIlroy (University of Lincoln) joins us for this semi
 nar in the Physical Applied Mathematics Series. Note the unusual room - 
 G.209 in the Alan Turing Building.\n\nAbstract:  The most common method 
 for printing plastics (polymer melts) is known as fused filament fabrica
 tion (FFF). This process involves melting a thermoplastic\, followed by 
 layer-by-layer extrusion\, cooling and re-solidification. The main conce
 rn with FFF is the strength at the welds between printed layers\; bulk s
 trength is never achieved in these regions and the reason is currently u
 nclear.\n\nWe use a molecularly-aware non-isothermal continuum model of 
 the polymer melt to predict how high-shear rates during the deposition p
 rocess can stretch and align polymer molecules with the flow direction. 
 For amorphous melts\, we attribute reduced weld strength to a partially 
 disentangled and oriented structure at the onset of the glass transition
 . For semi-crystalline melts\, we explore how the stretch induced by the
  printing flow can enhance nucleation and lead to accelerated crystalliz
 ation times and consequently a thin surface layer of smaller spherulites
 .\n\n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:G.209\, Alan Turing Building\, Manchester
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