GATE Mechanical Engineering (ME) 2018 Shift 1 Solved Paper

The true stress $\left(\mathit{\sigma }\right)$, true strain $\left(\mathit{\epsilon }\right)$ diagram of a strain hardening material is shown in figure. First, there is loading up to point A, i.e. up to stress of 500 MPa and strain of $0.5$. then from point A, there is unloading up to point B, i.e. to stress of $100\mathit{M}\mathit{P}\mathit{a}$, Given that the Young's modulus $\mathit{E}=200\mathit{G}\mathit{P}\mathit{a}$, the natural strain at point $\mathit{B}\left({\mathit{\epsilon }}_{\mathit{B}}\right)$____________ (correct to two decimal places).