Mechanics and SOM: Deformable material and Rigid material | Classification of Engineering Mechanics

Classification of Engineering Mechanics

Mechanics:

Mechanics is the branch of physical science which deals with the state of rest or motion of bodies that are subjected to the action for forces. In simple, Mechanics is the study of force and their effects on body.

Mechanics can be divided into two parts:

1. Static(at rest)
2. Dynamic(in motion)

Dynamic mechanics can further divided into two parts:

1. Kinetics(body in motion+force considered)
2. Kinematics(body in motion but force is not considered)

Static Mechanics:

Static mechanics is the branch of engineering mechanics which deals with the study of forces and there effects at rest.

Dynamic mechanics:

Dynamic mechanics is the branch of engineering mechanics which deals with the study of forces and there effects in motion.

Kinetics mechanics:

Kinetics mechanics is the branch of Dynamics, which deals with the study of bodies in motion due to the application
of forces.

Kinematics mechanics:

Kinematics mechanics is the branch of engineering mechanics which deals with the study of motion of a body without the considered of the force which is responsible for the motion.

Classification of Materials:

1. Deformable
2. Rigid(not exist): use only to solve complicated structure.


Materials are also classified into following categories from the engineering point of view:

a.) Elastic Material
b.) Plastic Material
c.) Elasto-plastic Material
d.) Ductile Material
d.) Brittle Material

1. Elastic Material:

A material is said to elastic material if it undergoes deformation on external loading and the deformation disappear on removal of the load. Example: steel, etc.

2. Plastic Material 

A material is said to be plastic if it undergoes deformation on external loading and the deformation does not disappear at all on removal of load. Example: gold, lead, etc.

3. Elasto-Plastic Material 

A material is said to be elasto-plastic if it undergoes deformation on external loading and the deformation disappears partially on removal of the load. Hence, a permanent deformation remains even after removal of the load in elasto-plastic material.

4. Ductile material

Ductile material is a material which can undergoes large deformation before failure. In other words, a material which can be drawn into wires is known as ductile material. Example: Aluminum, copper, nickle, etc.

5. Brittle Material

A brittle material is a material in which no deformation takes place when external load is applied and it fails by rupture. Example: concrete, glass, rubber, etc.

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