GLASS COMPOSITES
#1

PRESENTED BY:
PUNEET KUMAR SINGH

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COMPOSITES - INTRODUCTION
Composite materials are those that are formed by the combination of two or more materials to achieve properties that are superior to those of its constituents.
Composites could be
• Natural
• Synthetic.
Bamboo is a very good example of efficient Natural Composite. The components are cellulose and lignin, as in all other wood, however bamboo is hollow. This results in a very light yet stiff structure.
Centuries ago people used to use combination of mud and straw that forms a composite; to make their home, which is stronger than either the mud or the straw by itself
Composites are combinations of two materials in which one of the material is called the reinforcing phase, is in the form of fibers, sheets, or particles, and is embedded in the other material called the matrix phase.
Typically, reinforcing materials are strong with low densities while the matrix is usually a ductile or tough material. If the composite is designed and fabricated correctly, it combines the strength of the reinforcement with the toughness of the matrix to achieve a combination of desirable properties not available in any single conventional material.
COMPOSITE STRENGTH DEPENDS ON FOLLOWING FACTORS:
• Inherent fiber strength, Fiber length, Number of flaws
• Fiber shape
• The bonding of the fiber (equally stress distribution)
• Voids
• Moisture (coupling agents)
Glass Fiber
It was only in 1893, though that Edward D. Libby, the founder of Libby Glass Company, Toledo, Ohio, made filaments that could be woven into fabric.
The basis of textile grade glass fibers is silica, SiO2. In its pure form it exists as a polymer, (SiO2)n.
Other components are aluminum oxide, boron oxide, magnesium oxide, calcium oxide, sodium and potassium oxide.
Glass Fiber Composites
“A material having reinforcing phase as glass fiber in sheet, mat or in any other form embedded in a matrix phase (other than glass).”
Many types of resins are used to give a wide range of chemical, mechanical, and thermal properties. Polyester & Epoxy resins are used in most of the reinforced plastics
Properties
• High strength
• High modulus (50-90 GPa)
• High stiffness
• Non-flammable
• Resistant to heat
• Good chemical resistance
• Relatively insensitive to moisture
• Good electrical insulation
• Able to maintain strength properties over a wide range of conditions
Advantages of Composites
• Higher Specific Strength (strength-to-weight ratio)
• Design Flexibility
• Durability
• Corrosion Resistance
• Low Relative Investment
Disadvantages of Composites
• Composites are Heterogeneous
• Composites are relatively anisotropic
MANUFACTURING PROCESSES OF COMPOSITES
Composite materials have succeeded remarkably in their relatively short history. But for continued growth, especially in structural uses, certain obstacles must be overcome. A major one is the tendency of designers to rely on traditional materials such as steel and aluminum unless composites can be produced at lower cost.
Cost concerns have led to several changes in the composites industry. There is a general movement toward the use of less expensive fibers. For example, graphite and aramid fibers have largely supplanted the more costly boron in advanced–fiber composites. As important as savings on materials may be, the real key to cutting composite costs lies in the area of processing.
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#2
hi,
can any1 pls upload any GLASS COMPOSITES PROJECT REPOR.
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