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Figure shows the strain-stress curve for a given material. What are (a) Young's modulus and (b) approximate yield strength for this material ? |
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Answer» Solution :(a) From the given GRAPH for stress `150 xx 10 ^(6) Nm ^(-2)` corresponds strain is `0.002` `therefore` Young.s modulus ,= SLOPE of graph stress `to` strain `therefore` Young.s modulus `Y= ("Stress")/("Strain") =(150 xx 10 ^(6))/(0.002)` `therefore Y=7.5 xx 10 ^(8) Nm ^(-2)` (b) From graphs the YIELD strength of a material is the maximum stress, `= 300 xx 10 ^(6) Nm ^(-2)` `= 3 xx 10 ^(8) Nm ^(-2)` REALLY the yield strength is slightly less than `3 xx 10 ^(8) N m ^(-2)` |
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