Q. 24.1( 60 Votes )

# Figure 9.11 shows

Answer :

(a) Considering the graph from the question, highlight the part which corresponds to stress @ 150 × 10^{6} N/m^{2}

We can clearly observe that the strain at the stress point 150 × 10^{6} N/m^{2}, is 0.002.

By definition, Young’s modulus, Y =

⇒ Y =

⇒ Y = 7.5 × 10^{10} N/m^{2}

Hence, Young’s modulus for the given material is 7.5 × 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 above graph that the approximate yield strength of the material is 300 × 10^{6} Nm^{-2}.

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