The primary barrier to the use of composites materials is their high initial
costs in some cases, as compared to traditional materials, regardless of how
effective the material will be over its life cycle. Industry considers high
upfront costs, particularly when the life-cycle cost is relatively uncertain. This
cost barrier inhibits research into new materials. In general, the cost of
processing composites is very high, especially in the
hand lay-up process where raw material cost is only a small fraction of the
total cost of a finished product. The recycling of composite materials presents
a problem when penetrating a high-volume market such as the automotive
industry, where volume production is in the millions of parts per year. With
the new government regulations and environmental awareness, the use of
composites has become a concern and poses a big challenge for recycling.
Although composite materials other many benefits, the following disadvantages too
are there:
1. The cost for composite materials is almost 5 to 20 times high as compared
to the conventional material like steel and aluminum.
2. In the past, composite materials have been used for the fabrication of
large structures at low volume (one to three parts per day). The lack of
high-volume production methods limits the widespread use of composite
materials.
3. Classical ways of designing products with metals depend on the use of
machinery and metals handbooks and design data handbooks.Large design databases
are available for metals. Designing parts with composites lacks such books
because of the lack of a database.
4. The temperature resistance of composite parts depends on the temperature
resistance of the matrix materials. Some composites absorb moisture also which
may affect the properties and dimensional stability of the composites.
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