Materials not having a well defined yield point - Basic Mechanical Engineering

Q.  Which of the following materials do not have a well defined yield point?
- Published on 01 Sep 15

a. Heat treated steel
b. Concrete
c. Carbon fiber
d. All of the above

ANSWER: All of the above

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    Discussion

  • Sravanthi   -Posted on 06 Nov 15
    - Beyond yield point if a material is stressed, it undergoes plastic deformation and the material starts yielding. After attaining this point, the material does not regain its original shape even if load is removed.

    - The point at which strain increases without any increase in stress is called yield strength.

    - Non-ferrous materials, heat treated steels and brittle materials have well defined yield point.

    - Generally for many materials two yield points are observed Y1 and Y2. For practical purposes, these two points are considered same and is considered as single yield point Y.

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