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Composites (Disadvantages of Composites (Composites are heterogeneous…
Composites
definition
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wood is a good example of natural composite , combination of cellulose fiber and lignin. The cellulose fiber provides strength and the lignin is the "glue" that bonds and stabilizes the fiber
bamboo is a very efficient wood composite structure, the components are cellulose and lignin, as in all other wood , however bamboo is hollow. This results in a very light yet stiff structure, composite fishing poles and golf club shafts copy this natural design
the ancient Egyptians manufactured composite, adobe bricks are a good example,.. the combination of mud and straw forms a composite that is stronger than either the mud or the straw by itself
Combination/mixture of two or more constituents with an interface separating them in differ in form and chemical composition and essentially insoluble in each other
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Advantages of Composites
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Design flexibility
Composites have an advantage over other materials because they can be molded into complex shapes at relatively low cost. This gives designers the freedom to create any shape or configuration. Boats are a good example of the success of composites.
Corrosion Resistance
Composites products provide long-term resistance to severe chemical and temperature environments. Composites are the material of choice for outdoor exposure, chemical handling applications, and severe environment service.
Low Relative Investment
One reason the composites industry has been successful is because of the low relative investment in setting-up a composites manufacturing facility. This has resulted in many creative and innovative companies in the field.
Durability
Composite products and structures have an exceedingly long life span. Coupled with low maintenance requirements, the longevity of composites is a benefit in critical applications. In a half-century of composites development, well-designed composite structures have yet to wear out.
In 1947 the U.S. Coast Guard built a series of forty-foot patrol boats, using polyester resin and glass fiber. These boats were used until the early 1970s when they were taken out of service because the design was outdated. Extensive testing was done on the laminates after decommissioning, and it was found that only 2-3% of the original strength was lost after twenty-five years of hard service.
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