The GATE Grind

GATE 2018 ME (ME1) – Question 60

Casting, Forming and Joining Processes · Plastic deformation and yield criteria, hot and cold working · 2 marks · Numerical answer

A bar is compressed to half its original length. True-strain magnitude, to two decimals, is ______.

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: 0.69 to 0.70

Explanation

True strain is $\ln(L_f/L_0)=\ln0.5=-0.693147$. Its requested magnitude is 0.69; the engineering-strain magnitude would be 0.5.