Plastic deformation in stress strain curve - Material Science

Q.  Stress strain curve is shown below. Beyond point B, metal undergoes
- Published on 05 Aug 15
Material


a. less elastic deformation and more plastic deformation
b. only elastic deformation
c. more elastic deformation and less plastic deformation
d. only plastic deformation

ANSWER: only plastic deformation

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    Discussion

  • Sravanthi   -Posted on 06 Oct 15
    In the stress-strain curve, a metals obeys Hooke's law upto limit of proportionality. Hooke's law is not obeyed beyond this point and after reaching point C strain increases at a faster rate than stress. In case of mild steel point C and D are considered as upper and lower yield points.

    Plastic deformation starts beyond point B and point X is the point where maximum stress is reached. The test specimen fractures into two pieces when necking starts at point X.

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