Stress is defined as the resisting force per unit area of a body against deformation when external force is applied on it.
While stretching a rubber band, the external force is hand which pulls the rubber band.
The deformation is the distance
the rubber band stretches.
The rubber tends to regain its original position which is stated as stress.
Mathematically stress is written as force per unit area.
Stress, σ =P/A
Here,
σ = Stress
P= External Force or Load
A= Cross-sectional Area
Unit of stress is Newton per millimetre square.
Different types of stress occurs in a body, they are,
Tensile stress, compressive stress and shear stress.
Tensile Stress:
The stress created when two equal and opposite forces is acting on a body is said to be tensile stress.
Compressive Stress:
The stress created when two equal and opposite push is acting on a body is called as compressive stress.
Shear Stress:
The stress created when two equal and opposite slide is acting on a body is called as shear stress.
Let us move on the strain.
Due to some external stress, the body tends to change it original dimension which is referred as strain.
The strain is defined as the ratio of change in dimension of the body to the original dimension in the body.
Strain = δL/L
Hear,
δL= Change in dimension of the body
L= Original dimension in the body
Different types of strain are occur in a body they are,
Tensile strain, compressive strain, shear strain and volumetric strain.
If the length of the body increases under the action of the force, the strain caused is referred as tensile strain.
If the length of the body decreases under the action of the force, the strain caused is referred as compressive strain.
If the length of the body deformed under the action of the force, the strain caused is referred as shear strain.
If the volume of the body changes under the action of the force, the strain caused is referred as volumetric strain.
While stretching a rubber band, the external force is hand which pulls the rubber band.
The deformation is the distance
the rubber band stretches.
The rubber tends to regain its original position which is stated as stress.
Mathematically stress is written as force per unit area.
Stress, σ =P/A
Here,
σ = Stress
P= External Force or Load
A= Cross-sectional Area
Unit of stress is Newton per millimetre square.
Different types of stress occurs in a body, they are,
Tensile stress, compressive stress and shear stress.
Tensile Stress:
The stress created when two equal and opposite forces is acting on a body is said to be tensile stress.
Compressive Stress:
The stress created when two equal and opposite push is acting on a body is called as compressive stress.
Shear Stress:
The stress created when two equal and opposite slide is acting on a body is called as shear stress.
Let us move on the strain.
Due to some external stress, the body tends to change it original dimension which is referred as strain.
The strain is defined as the ratio of change in dimension of the body to the original dimension in the body.
Strain = δL/L
Hear,
δL= Change in dimension of the body
L= Original dimension in the body
Different types of strain are occur in a body they are,
Tensile strain, compressive strain, shear strain and volumetric strain.
If the length of the body increases under the action of the force, the strain caused is referred as tensile strain.
If the length of the body decreases under the action of the force, the strain caused is referred as compressive strain.
If the length of the body deformed under the action of the force, the strain caused is referred as shear strain.
If the volume of the body changes under the action of the force, the strain caused is referred as volumetric strain.
Video Link:
Comments
Post a Comment