Introduction On
In earlier studies, we went through a basic course in mechanics called Rigid Bodies, more often called Engineering Mechanics or Applied Mechanics. Mechanics as such are subdivided into three branches; Mechanics of solids, Mechanics of deformable bodies and mechanics of fluids.
The mechanics of rigid bodies assumed that the bodies were absolutely rigid, i.e. E. The deformation of bodies under the action of the loads with which they are subjected to statics, and the Dynamics are two branches of the Mechanics of Rigid bodies, including end and moving bodies, respectively
Stress: -
I. The resistance force per unit is proposed by the opposing body, known as stress. When the body is subjected to external load, the body experiences some deformation. At the same time, the internal force of resistance is due to the adhesion of molecules inside the body. Thus, stress occurs in the body under external load
Ii. If the body is able to withstand an external load, it is considered stable, in equilibrium, and therefore for this condition the internal resistance force must be equal to the external load.
By definition Voltage = resistance force / cross sectional area
Or Stress = P / A
Voltage: -
Since the body creates a resistance force to counteract the external load, it experiences some deformation. The degree of deformation depends on the material properties, such as molecular cohesion. The ratio of change of dimension is known as deformation.
Since Strain is a ratio, it has no units. We denote the deformation by the letter e. If L is the original size and is the change in dimension, then
Strain = Resize / Original Size
Types of stress On
1) direct Stress and straight strain:
When the resistance force acts normally or perpendicularly to the area in which it acts, the voltage generated in this way is called the forward or normal voltage, and the corresponding voltage is called the forward voltage.
We will deny the direct stress letter. Forward stress may have a tensile nature of compressive nature.
2) Stretch limit: -
When the resistance force acts away from the cross-sectional area, the forward tension has a tensile character. The limits of stretching tend to increase the initial size.
3) Compress stress: -
When the resistance force acts on the cross-sectional area, the forward stress is compressive. Stress compression tends to reduce the original size.
