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Two different types of rubber are found to have the stress – strain curves as shown in the figure stressi) In what ways do these curves suffer from the stress- strain curve of a metal wire? 2) Which of the two rubbers A and B would you prefer to be installed in the working of a heavy machinery 3) Which of these two rubbers would you choose for a car tyre? |
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Answer» 1) Since for the above curves, Hooke’s law is not obeyed as the curve is not a straight line Hence such type of curve are called as elastic hysteresis as the materials do not retrace curve during unloading. 2) Rubber B is preferred because area of loop B is more than that of A which shows more absorption power for vibrations which is useful in machinery. 3) Since hysteresis loop is a direct measure of heat dissipation, hence rubber A is preferred over B so to minimize the heating in the car tyres. |
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