Question

4. When a bar is subjected to
increase in temperature and its
deformation is prevented, the stress
induced in the bar is
O (a) Tensile
O (b) Compressive
0 (c) Shear
O
(d) None of the above
This is a required question​

Answer 1

Answer:

(d) none of the above

Explanation:

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Answer 2

When a bar is subjected to change in temperature and deformation is prevented then the stress induced in the bar is Thermal stress. So option (d) None of the above is correct.

Explanation:

Let us understand this question option by option.

(a)Tensile stress: The stress applied on the load (bar)which tends to pull or push the load along the line of force applied is known as Tensile stress.

So a bar experiences Tensile stress if the bar is moved along the line of force applied. Therefore option (a) is not correct.

(b) Compressive stress:  The stress applied on the load to cause it to deform and occupy a smaller volume is known as Compressive stress.

Since in the question the deformation is prevented therefore option (b) can not be correct.

(c) Shear stress: It is the stress experienced by the load when tangential force is applied on it .For example a shearing force applied to the top of the rectangle while the place of the bottom is fixed at it's location. The resulting shear stress deforms the rectangle into a parallelogram.

Since in this case also deformation of the bar occurs, therefore option (c) is also not correct.

Hence option (d) None of the above is correct.

NOTE:  Thermal stress is the stress experienced by a load(bar) due to any change in temperature of the material. This types stress can lead to  plastic deformation depending on the other variables of heating.