Claire McIlroy - Modelling Extrusion-Based 3D Printing of Entangled Polymers
|Starts:||14:00 23 Oct 2019|
|Ends:||14:50 23 Oct 2019|
|What is it:||Seminar|
|Organiser:||Department of Mathematics|
|Who is it for:||University staff, External researchers, Current University students|
Claire McIlroy (University of Lincoln) joins us for this seminar in the Physical Applied Mathematics Series. Note the unusual room - G.209 in the Alan Turing Building.
Abstract: The most common method for printing plastics (polymer melts) is known as fused filament fabrication (FFF). This process involves melting a thermoplastic, followed by layer-by-layer extrusion, cooling and re-solidification. The main concern with FFF is the strength at the welds between printed layers; bulk strength is never achieved in these regions and the reason is currently unclear.
We use a molecularly-aware non-isothermal continuum model of the polymer melt to predict how high-shear rates during the deposition process 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 crystallization times and consequently a thin surface layer of smaller spherulites.
Organisation: University of Lincoln
Travel and Contact Information
Alan Turing Building