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8.Mechanical Properties of Solids
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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?
Option A
Option B
Option C
Option D
Solution
It is clear from the given graph that for stress $150 \times 10^{6} N / m ^{2},$ strain is 0.002
(a) Young's modulus, $Y=\frac{\text { stress }}{\text { strain }}$
$=\frac{150 \times 10^{6}}{0.002}=7.5 \times 10^{10} N / m ^{2}$
Hence, Young's modulus for the given material is $7.5 \times 10^{10} N / m ^{2}$
(b) The yield strength of a material is the maximum stress that the material can sustain without crossing the elastic limit.
It is clear from the given graph that the approximate yield strength of this material is $300$
$\times 10^{6} \,Nm /^{2}$ or $3 \times 10^{8}\, N / m ^{2}$
Standard 11
Physics
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