Define Normal stress. Give its types.

1.	Define Normal stress. Give its types.
Answer» Here the force is applied normal to the surface is called Normal stress. It is again of two types : Longitudinal and Bulk or volume stress. (i) Longitudinal stress (a) Deforming force is applied parallel to the length and causes increase in length. (b) Area taken for calculation of stress is area of cross section. (c) Longitudinal stress produced due to increase in length of a body under a deforming force is called tensile stress. (d) Longitudinal stress produced due to decrease in length of a body under a deforming force is called compressional stress. (ii) Bulk or Volume stress (a) It occurs in solids, liquids or gases. (b) Deforming force is applied normal to surface at all points. (c) It is equal to change in pressure because change in pressure is responsible for change in volume.

Answer»

Here the force is applied normal to the surface is called Normal stress.

It is again of two types : Longitudinal and Bulk or volume stress.

(i) Longitudinal stress

(a) Deforming force is applied parallel to the length and causes increase in length.

(b) Area taken for calculation of stress is area of cross section.

(d) Longitudinal stress produced due to decrease in length of a body under a deforming force is called compressional stress.

(ii) Bulk or Volume stress

(a) It occurs in solids, liquids or gases.

(b) Deforming force is applied normal to surface at all points.

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