2) In the modern era metal is replaced by plastics. Explain.
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One of the challenges in using thermoplastics to replace metals is that many structural parts need to be stiff and offer high impact strength. These properties were indirectly related in thermoplastics until about 50 years ago, when glass fiber was added to the polymer. This would help carry a load over a greater surface area and increase the flexural strength, stiffness, modulus, tensile, and impact strength by as much as 300% to 400%, according to Ron Hawley, the chief science officer of Integrated Composite Products Inc. (ICP). So the age of thermal plastics began.
Until the 1970s, glass was typically added during an extrusion process. There are a great deal of shear stresses involved in getting the glass fibers into the resin and making sure it is fully mixed—or wetted out—into the polymer. This would cause the glass fibers to break into relatively short lengths (typically under a millimeter). To work as reinforcement and improve performance by 300% to 400%, the fiber should have an aspect ratio of the length to diameter of about 20 to 1.
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Explanation on the topic "In the modern era metal is replaced by plastics":
- In today's world plastic has taken place of almost everything because of the nature of different types of plastic available on made by humans.
- From strength to flexibility to soft, every kind of plastic is available in market. Hence it is seen that the market of plastic is in many places replacing the market of metals.
- The metals are known for their strength, ductility and there resistance to temperature but are more prone to getting oxidised and rusting while in case of plastic strength ductility and resistance to temperature are present and their also so when official as they don't get oxidized or don't rust.
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In the modern era metal is replaced by plastics. explian
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