## General Mechanics

### #Physics #Stress #Strain

Force-A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force.
WE CAN CLASSIFY FORCES INTO TWO CATEGORIES
1. CONTACT
2. NON CONTACT #### Applied Force #### Drag Force #### Frictional force #### Gravitational force #### Electrostatic force #### Magnetic Force

1.  Stress : When we apply Some force on an body the body tends to resist that force. This magnitude of resistance is different for different material and different loads and measured by Stresses Stresses= Resisting Force / Cross Sectional Area if deformation after applying load is negligible then the Resisting Force = Applied load

Thus this formula may be used as

Stresses = applied Force / Cross sectional area { Deformation <<<)

1.  Strain : It is the ratio of the change in size or shape to the original size or shape. It has no dimensions, it is just a number. #### Longitudinal strain

Longitudinal strain: If the deforming force produces a change in length alone, the strain produced in the body is called longitudinal strain or tensile strain. #### Volumetric strain

If the deforming force produces a change in volume alone, the strain produced in the body is called volumetric strain. #### Shear strain

The angle tilt caused in the body due to tangential stress expressed is called shear strain.

Hooks Law: Strain is directly proportional To Stress under elastic limit. #### Youngs modulus

It is defined as the ratio of tensile
stress or compressive stress to the corresponding strain within elastic limit. It
is denoted by symbol E. It is also known as modulus of elasticity or elastic modulus. #### Modulus of Rigidity

It is defined as the ratio of shear stress to
corresponding shear strain within elastic limit. It is also known as shear modulus. It
is represented by C or G or N. #### Volumetric Strain

It is defined as the ratio of direct stress to the
corresponding volumetric strain within elastic limit. It is denoted by K.

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