Question: 1 1 B i ) Construct schematic stress - life plot for steel 6 9 0 MPa, f I = 8 5 0 MPa, E

11B i) Construct schematic stress-life plot for steel
690MPa,fI=850MPa,E=202GPa ) specimens for following
cases.
Specimen A: 6 mm diameter, notch free, mirror polished finish,
subjected to completely reversed bending.
Specimen B: 50 mm diameter, notch free, mirror polished finish
subjected to completely reversed axial loading.
ii) Compare and comment on observed changes in stress-life plots for
above case with relevant reasoning.
1 1 B i ) Construct schematic stress - life plot

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