Question

Which one of the following statements is correct? In the case of
A Shearing stress there is change in volume
B Hydraulic stress there is no change in shape
C Shearing stress there is no change in shape
D Hydraulic stress there is no change in volume

Answer 1

Hint: Stress is expressed as \[\dfrac{F}{A}\] mathematically. Stress is not physically the same as pressure, because the external force per unit area is considered for pressure, but the internal force per unit area is considered for stress. Stress is a measure between its particles of the internal forces in a body. These internal forces are a response to the body's external forces that cause it to separate.

Complete answer:
1.There is a change in shape without any change in volume in the case of shearing pressure. 2.There is a change in volume without any change in shape in the event of hydraulic stress.
3.There is a restorative force that develops in the ball due to the force exerted by the water, which is equal in magnitude to the force applied by the water, but in the opposite direction.
4.This stress type is referred to as hydraulic stress. Example: Due to water pressure, if the rubber ball is thrown into the water force, it will act on a ball from all directions.
5.As a consequence, the ball appears to have contracted slightly. But there is a force of restoration that develops in the ball, equal in magnitude to the force applied.

Note:
A shape change due to the application of a force is referred to as a deformation. Strain (or volume strain) is called shear strain, and that is caused by shear stress. The relationship between strain and stress, however, need not be linear. The deformation is only when there is sufficiently low stress..