The diagram represents the stress-strain…is correct

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The diagram represents the stress-strain graph of a loaded wire. Which of these statements is correct?

• A. At I, the wire becomes plastic
• B. J is the yield point
• C. L is the elastic limit
• D. At K. the wire breaks

QUICK ANSWER…

B

DETAILS…

If the above diagram represents the behavior of an elastic material, then:

• Point I is the proportionality limit, it is the point beyond which the material stop obeying Hooke's law. Also, beyond this point, the material temporarily loses its elasticity and begins to deform.
• Point J is the elastic limit or yield point, it is a point beyond which the material enters into plastic region and permanently loses its elasticity. The material may slowly regain its elasticity if it falls between I and J, but anything beyond J is a region of permanent deformation.
• Point K is the ultimate stress point, it is a point of maximum stress on the material just before breakage.
• Point L is the breaking point, it a point at which the bond closely holding the material together is totally separated and broken.

Now for the right answer to the above question:

1. Option A is incorrect. the wire becomes plastic at J and not I.
2. Option B is correct. yes, J is the yield point or elastic limit.
3. C is incorrect. L is the breaking point and not the elastic limit.
4. D is not the correct answer. the wire breaks at L and not K.

HELPFUL TIPS…

You may please note these/this:

• Point J is the yield point, a point beyond which the material becomes plastic.

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/culled from 2019 JAMB-UTME physics question 23/