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"Slip-stick" fracture and toughness enhancement in thermoset/thermoplastic polymer alloys under shear
Journal article   Peer reviewed

"Slip-stick" fracture and toughness enhancement in thermoset/thermoplastic polymer alloys under shear

Debashish Mukherji and Cameron F. Abrams
Europhysics letters, v 90(2), p26003
01 Apr 2010
DOI: https://doi.org/10.1209/0295-5075/90/26003

Abstract

Physical Sciences Physics Physics, Multidisciplinary Science & Technology
Using large-scale molecular-dynamics simulation of a generic model, we study the mechanical behavior of thermoset/thermoplastic polymer alloys under shear. We investigate the effect of thermoplastic mass fraction Gamma(l) and the thermoplastic chain length N-l. Our results show two different fracture peaks in the stress-strain behavior. The first peak occurs at around 60% strain followed by a stress plateau, and the system fails at around 90% strain. This "slip-stick" fracture is independent of shear rate (epsilon) over dot and only occurs when Gl is less than the threshold concentration Gamma* at which thermoplastic chains start to overlap. A micro-structural analysis suggests that the escape of thermoplastic chains from cavities near the fractured interfaces gives rise to slip-stick behavior. Slip-stick behavior has a strong chain length dependence and is only observed when N-l is greater than critical chain length N-l(c) = 40. Slip-stick fracture makes an alloy of Gamma(l) = 4.7% more than 40% tougher than a neat thermoset. Copyright (C) EPLA, 2010

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Physics, Multidisciplinary
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