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Compressive response of multiple-particles-polymer systems at various strain rates

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Author: Fan, J.T. · Weerheijm, J. · Sluys, L.J.
Type:article
Date:2016
Publisher: Elsevier Ltd
Source:Polymer (United Kingdom), 91, 62-73
Identifier: 534565
doi: DOI:10.1016/j.polymer.2016.03.041
Keywords: Materials · Hybrid polymers · Mechanical properties · Split Hopkinson pressure bar · Bridge decks · Composite materials · Dynamics · Filled polymers · High speed cameras · Impact resistance · Mechanical properties · Polyurethanes · Scanning electron microscopy · Strain energy · Stress-strain curves · Yield stress · Compressive mechanical properties · Dynamic stress-strain relation · Elastomeric materials · Elastomeric matrices · Filled polymer composites · Hybrid polymers · Split Hopkinson pressure bars · Strain-rate-dependent · Strain rate · Observation, Weapon & Protection Systems · EBP - Explosions, Ballistics & Protection · TS - Technical Sciences

Abstract

Multiple-particles-polymer systems of a polyurethane elastomeric matrix embedding 25wt.% and 50wt.% 0.5 mm-diameter PMMA particles were investigated using a split Hopkinson pressure bar (SHPB) setup for revealing the dynamic compressive mechanical response. Taking the 25wt.%-particles-polymer system as a reference case, the characteristics of the dynamic stress-strain relation were quantified and analyzed. Yield stress, maximum stress and strain energy show strain rate dependent behaviour, following a power law function. Based on the power law functions, a strength-toughness relation induced by strain rate was derived. The static and dynamic compressive mechanical properties of the 25wt.%-particles-polymer system and these of the monolithic polyurethane elastomeric material were compared. A high-speed camera was applied to record crack initiation, propagation, interaction and final fragmentation. Scanning electron microscopy (SEM) was employed to explore the damage mechanisms of the multiple-particles-polymer system. By comparing the dynamic compressive data of the 25wt.%- A nd 50wt.%-particles-polymer systems, the multiple particles effect on the dynamic compressive response was analysed. The results of this study are of significance for developing a transparent particles-polymer framework with a required static stiffness for impact-resistant applications and for designing and evaluating hybrid particles-filled polymer composite material systems. © 2016 Elsevier Ltd. All rights reserved.