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Consider the stress-strain curve for an ideal elastic-plastic strain hardening metal as shown in the figure. The metal was loaded in uniaxial tension starting from O. Upon loading, the stress-strain curve passes through initial yield point at P, and then strain hardens to point Q, where the loading was stopped. From point Q, the specimen was unloaded to point R, where the stress is zero. I f the same specimen is reloaded in tension from point R, the value of stress τ which the material yields again is _____MPa
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- In this case material with start yielding from point ‘P’ instead of ‘P’
- In this case material with start yielding from point ‘P’ instead of ‘R’
- material with start yielding from point ‘R’ instead of ‘P’
- None of these
Correct Option: C
As the point loaded beyond the yield point is unloaded completely and reloaded then because of strain hardening (residual strain remains in body) increase the yield strength.
In this case material with start yielding from point ‘R’ instead of ‘P’.
