Assembly Design Concepts for Damping Nanoparticle-Reinforced Materials
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Assembly Design Concepts for Damping Nanoparticle-Reinforced Materials M.V. Kireitseu1,2, G.R. Tomlinson1, R.A. Williams2 Department of Mechanical Engineering, Rolls-Royce Centre in Damping, the University of Sheffield, Mappin Street, Sheffield S1 3JD, the United Kingdom 2 Institute for Particle Science & Engineering, School of Process, Environmental & Materials Engineering, the University of Leeds, Leeds, LS2 9JT, the United Kingdom 1
ABSTRACT In this paper, the concepts of nanotechnology-based fan blade have been introduced and CNTreinforced hollow micro-balloon-based syntactic foams/composites and damping coatings have been applied so as to develop the next generation aerospace components. The focus in this paper is directed toward the development of the next generation of vibration damping systems, providing a road map to manufacturing technology and design solutions.
INTRODUCTION Energy dissipation (damping) in structures/materials is important as it reduces resonant amplitudes/noise levels giving enhanced integrity and life cycle behavior. If we then go to the nanoscale, the damping levels/dynamics of materials are mostly unknown and require extensive investigations. By invoking the properties of nano-auxetics/nanostructures it may be possible to control the wave propagation in the material and thus enhance the energy dissipation. Vibration damping under severe temperature, pressure, or fluid flow conditions is usually handled by structural design optimization, material selection, and other measures. This review is focused on the problem of nano-micro scale reinforcement of materials for enhanced vibration damping/dynamics of engineering structures.
DESIGN AND MANUFACTURING There are three types of solid material matrices available for engineering of damping structures: metals, polymers and some ceramics [1, 2]. Damping and integrity often have opposite requirements. Viscoelastic polymers have good damping ability, but their stiffness, performance and durability is decreased at high temperatures (above 200oC). Metal and ceramic materials have good stiffness at high temperatures, but they have low vibration damping ability in comparison with polymer-based materials. High damping and increased stiffness of a material is the best option, but it is difficult to achieve. Damping materials are often used in conjunction with metals or fibre-reinforced composites to yield structures with enhanced vibration performance. Selected matrix will mostly determine mechanism of energy dissipation [3, 4]. Notwithstanding the fact that significant achievements have been made in macro-scopic vibration damping solutions in recent years, further enhanced vibration damping can be provided via nano-scale reinforcements where at least one dimension
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limited to between 1 - 100 nanometres. Small nanoparticle volume (1-5%) may greatly affect material’s behaviour due to extreme nanoparticle properties over traditional materials [5-7]. Nanotube-reinforced polymer-matrix composite material
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