The stress shown in the figure is called Shear stress.
The given problem is based on the concepts of stresses and type of stress. The stress is defined as the force applied per unit area. The types of stresses are as follows:
- Compression stress
- tensile stress
- Shear stress.
In Compression stress, the force tends to squeeze the material such the force acts perpendicular to surface.
In Tensile stress, the applied force tends to elongate dimensions of material, to change the shape of material.
Shear stress is cause due to the force tends to deform the material by slippage along a plane or planes parallel to imposed stress.
In the given figure, the upper layer of material tends to move in the direction opposite to the direction of lower layer due to application of force. This is called slippage, and hence stress produced is known as Shear stress.
Thus, we can conclude that the stress shown in the figure is called Shear stress.
Learn more about the shear stress here:
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