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SUMMARY:Impact perforation of polymers and polymer-metal laminates - Dr Gr
 aham McShane\, CUED
DTSTART:20141128T140000Z
DTEND:20141128T150000Z
UID:TALK54800@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:This investigation considers the use of ductile polymers to en
 hance the impact resistance of lightweight structures.  Two specific appli
 cations motivate the study: polymer linings for spall capture\, and the us
 e of polymer layers to increase the impact perforation resistance of light
 weight aluminium alloy plates. Polymers are attractive in these applicatio
 ns due to low cost\, ease of processing and microstructural versatility. F
 irst\, the impact response of monolithic semi-crystalline thermoplastic ta
 rgets is considered\, including Low Density Polyethylene (LDPE)\, High Den
 sity Polyethylene (HDPE) and Ultra High Molecular Weight Polyethylene (UHM
 WPE). These three materials provide contrasting microstructures and mechan
 ical properties\, with only small variations in density. The relationship 
 between the impacting projectile nose shape\, the polymer characteristics 
 (yield strength\, strain hardening\, ductility) and the perforation resist
 ance is investigated. Secondly\, the impact response of polymer-metal bi-l
 ayer targets is considered. Quasi-static and impact perforation experiment
 s are used to identify the influence of a polymer layer on the modes of de
 formation and fracture of a thin aluminium alloy substrate. Optimal polyme
 r layer thicknesses are identified that maximise perforation energy per un
 it mass of target. Bi-layer configurations are shown to outperform monolit
 hic metallic targets of equal weight. Finally\, numerical modelling result
 s will be presented\, providing additional insights into the perforation r
 esponse of the polymer-metal bi-layer targets.
LOCATION:Oatley Seminar Room\, Department of Engineering
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