GATE 2019 ME (ME1) – Question 51
A 100 mm tensile specimen fails at 40 kN and cross-head displacement 15 mm. UTM compliance is constant at $5\times10^{-8}$ m/N. Find specimen failure strain (%).
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Correct answer: 12 to 14
Explanation
Machine deformation is $CF=5\times10^{-8}(40000)=0.002$ m, or 2 mm. Specimen extension is $15-2=13$ mm. Engineering failure strain is $13/100=0.13$, or **13%**.