Question

what is volume stress

Answer 1

Normal stress on a body causes change in length or volume and tangential stress produces change in shape of the body is called volume stress.

Answer 2

Bulk Stress or Volume Stress: When the volume of body changes due to the stress it is termed as Volume stress. A body that is under the force of pressure P, when submerged in a liquid, the body confronts a force that at any time is perpendicular or normal to the surface of the object. The area that the force is acting on is directly proportional to the magnitude of the force.
Bulk Stress =    Force/Area= Pressure