INTRODUCTION: Many of the modern technologies require materials with unusual combinations of properties that cannot be met by the conventional metal alloys, ceramics and polymeric materials. This is especially true for materials that are needed for aerospace, under water and transportation applications. For example, aircraft engineers are increasingly searching for structural materials that have low densities, are strong, stiff, impact resistant, and are not easily corroded. This is rather formidable
MATRIX NATURAL FIBRE COMPOSITE ABSTRACT The developments in the field of composite materials are growing tremendously day by day. One such development is the use of natural fibres as reinforcement in the composite material. This is attributed to the fact that natural fibres are environmental friendly, economical, easily available and non-abrasive. The main objective of this experimental study is to fabricate the flax-kenaf fibres reinforced hybrid composites and to evaluate the
METAL MATRIX COMPOSITES Index • Introduction • Fabrication Methods • Properties of MMCs • Application of MMCs Introduction Metal matrix composites (MMCs) usually consist of a low-density metal, such as magnesium or aluminum, reinforced with particulate or fibers of a ceramic material, such as silicon carbide or graphite. Compared with unreinforced metals, MMCs offer higher specific strength and stiffness, higher operating temperature, and greater wear resistance, as well as the opportunity to
ABSTRACT Composites play significant role as engineering material and their use has been increasing day by day due to their specific properties such as high strength to weight ratios, high modulus to weight ratio, corrosion resistance, and wear resistance. In present work, an attempt is made to hybridize the material using synthetic (glass) as well as natural fibers (chemically treated sisal), such that to reduce the overall use of synthetic reinforcement, to reduce the overall cost, and to enhance
Natural fibers represent environmentally friendly alternatives to conventional reinforcing fibers (glass, carbon, kevlar). Advantages of natural fibers over traditional ones are low cost, high toughness, low density, good specific strength properties, reduced tool wear (nonabrasive to processing equipment), enhanced energy recovery, CO2 neutral when burned, biodegradability. Because of their hollow and cellular nature, natural fibers perform as acoustic and thermal insulators and exhibit reduced
Overview of advanced polymer composites Polymer composites are assuring in Mechanical and Tribological application due to the possibility of tailoring their properties. These polymer composites have observed in application such as automotive, aerospace and sports equipment industries. When we compared to most metals and unreinforced plastics, this offer a high strength, corrosion resistant, durable and can be fabricated into complex shapes. Major advantages of composite materials are that they can be tailored
WELDING: Vibrations move parts at a minimum of 20,000 hertz, causing friction that melts metal and plastic parts. Ultrasonic can be used to spot weld, change adhesives to molten material, and melt films and fabrics together. Used for sealing and staking—melting thermoplastic studs to mechanically lock dissimilar materials in place. The process can also be used for slitting. Q24: Purpose of deflocculant? 1. Reduce amount of water in slip • If the slip is too wet the pores of the dry plaster molds will
for new production technologies and materials. • Favorable accident performance, high stability, less splintering. • Favorable ecobalance for part production. • Favorable ecobalance during vehicle operation due to weight savings. • Occupational health benefits compared to glass fibres during production. • No off-gassing of toxic compounds (in contrast to phenol resin bonded wood and recycled Cotton fibre parts) and reduced fogging behavior. • Price advantages both for the fibres and the applied technologies
2008). Epoxy usually has a compressive strength of 12,000 psi or greater which exceeds most of concrete strength (Banville, M.H., 2008). That's why epoxy is a great material for repairs of honeycombs. However, this kind of material cures very slow that it takes hours/days to harden. The slow curing process of epoxy can be an advantage because it allows time for the epoxy to flow through between its pockets. On the other hand, without proper caution the epoxy may flow out at the backside of the crack
The grafting methods of cellulose and cellulosic materials basically fall into three major types: (1) Initiation by chemical method, (2) Initiation by irradiation and (3) Initiation by thermal method. Investigation by grafting by chemical means is preferred owing to their simple nature and less requirement