Project ForgeStrength of Materials
Stress & Strain
GATE 2021
Medium
The loading and unloading response of a metal is shown in a stress-strain figure: the loading curve reaches 200 MPa at strain 0.03, and unloading returns to zero stress at strain 0.01. The elastic and plastic strains corresponding to 200 MPa stress, respectively, are
- A0.01 and 0.01
- 0.02 and 0.01
- C0.01 and 0.02
- D0.02 and 0.02
Explanation
Total strain at 200 MPa is 0.03. On unloading, the permanent (plastic) strain remaining at zero stress is 0.01. The recovered (elastic) strain is the difference: 0.03-0.01=0.02.
Source: GATE ME 2021 Session 1 (ME-1) (2021)
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