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Polymers 2016, 8(4), 77;

Static and Dynamic Properties of Semi-Crystalline Polyethylene

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Patrick Ilg
Received: 22 December 2015 / Revised: 28 February 2016 / Accepted: 2 March 2016 / Published: 28 March 2016
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Properties of extruded polymers are strongly affected by molecular structure. For two different semi-crystalline polymers, low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE), this investigation measures the elastic modulus, plastic flow stress and strain-rate dependence of yield stress. Also, it examines the effect of molecular structure on post-necking tensile fracture. The static and dynamic material tests reveal that extruded UHMWPE has a somewhat larger yield stress and much larger strain to failure than LDPE. For both types of polyethylene, the strain at tensile failure decreases with increasing strain-rate. For strain-rates 0.001–3400 s−1, the yield stress variation is accurately represented by the Cowper–Symonds equation. These results indicate that, at high strain rates, UHMWPE is more energy absorbent than LDPE as a result of its long chain molecular structure with few branches. View Full-Text
Keywords: extruded polyethylene; plastic flow; molecular structure; mechanical behavior; split Hopkinson bar extruded polyethylene; plastic flow; molecular structure; mechanical behavior; split Hopkinson bar

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Xu, M.-M.; Huang, G.-Y.; Feng, S.-S.; McShane, G.J.; Stronge, W.J. Static and Dynamic Properties of Semi-Crystalline Polyethylene. Polymers 2016, 8, 77.

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