Dynamic Behaviour of Carbon/Ultra High Molecular Weight Polyethylene (UHMWPE) Hybrid Composite Laminates Under Ballistic
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RESEARCH PAPER
Dynamic Behaviour of Carbon/Ultra High Molecular Weight Polyethylene (UHMWPE) Hybrid Composite Laminates Under Ballistic Impact T. S. Reddy1 · P. R. S. Reddy1 · V. Madhu1 Received: 20 January 2020 / Accepted: 25 September 2020 © Society for Experimental Mechanics, Inc 2020
Abstract Hybrid composites are versatile materials for armour and aerospace applications as they can confer the advantages of both the fibres to the system. Carbon/UHMWPE hybrid composites were prepared by varying volume % of carbon and UHMWPE laminates using the hot press method. The hybrid composites were each subjected to ballistic impact from a 7.62 × 39 mm mild steel (MS) projectile at an impact velocity of 730 ± 10 m.s− 1. The effect of hybridization ratio on the energy absorption of hybrid composites was investigated. The specific energy density (SED) dissipated by the hybrid composites was determined and it is found to increase with increasing volume % of UHMWPE. The real time dynamic deformation of the hybrid composites under ballistic impact was recorded using a high speed video camera. The back face deformation and bulge growth rate of hybrid composites were determined and the results are presented. Post impact analysis of the composites was carried out to examine the various failure modes. Keywords Carbon · UHMWPE · Hybrid composite · Ballistic impact · Deformation
Introduction Development of composite materials with good structural characteristics and good penetration resistance is currently needed for a wide range of military and civil applications. Carbon fibre reinforced composites are used widely in various structural applications such as commercial aircrafts, sporting equipment, automotive structures etc. owing to their superior mechanical properties [1]. Recently, researchers are exploring the possibility of utilizing these composites for armour applications also, mainly due to their high specific strength and modulus [2–4]. However, the limitations of carbon composites are low failure strain and brittleness, which make them more susceptible to out of plane loads caused by impact. Ultra high molecular weight polyethylene (UHMWPE) which is commercially available as Dyneema® and Spectra® has unique properties such as high specific strength, high strain to failure, high elastic wave speed, * T. S. Reddy [email protected] 1
Defence Metallurgical Research Laboratory, Hyderabad 500058, India
better energy absorption capability [5]. However, laminates of UHMWPE suffer from poor compressive strength and lower stiffness, which inhibit their usage in a number of structural applications [6]. These limitations of both carbon and UHMWPE composites can be mitigated by applying the concept of hybridization whereby positive characteristics of both fibre materials can be introduced and consequently hybrid composites can be utilized for dual purpose i.e. structural as well as armour applications. In general, composites that are made up of two or more different fibres using same matrix or vice versa are generally term
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