Site pages

Current course

Participants

General

20 February - 26 February

27 February - 5 March

6 March - 12 March

13 March - 19 March

20 March - 26 March

27 March - 2 April

3 April - 9 April

10 April - 16 April

17 April - 23 April

24 April - 30 April

## Lesson 7. WORK AND MECHANICS OF MATERIALS

Lesson 7
WORK AND MECHANICS OF MATERIALS
Mechanical work is the amount of energy transferred by a force acting through a distance. Like energy, it is a scalar quantity, with SI units of joules. The term work was first coined in 1826 by the French mathematician Gaspard-Gustave Coriolis.
When- ever a force acts on a body and the body under goes a displacement, the work is said to be done. As shown is figure the body on which a force ‘P’ is acting on a body moves through a distance‘s’,
Fig.7.1 Work
7.3 Mechanics of Material
It is a branch of engineering mechanics which deals with the behavior of elastic bodies (or) deformable bodies. Mechanics of materials mainly deals with the - Stresses
- Strains
Strength is defined as the maximum internal resistance force (stress) that a material can withstand without any failure.
It is an ability of a material i.e. the resistance against the deformation.
It is the property of the material at any given points the properties of given material are same in all direction.
At a point in 3 mutually perpendicular direction properties are different. An orthotropic material has two or three mutually orthogonal two fold axes of rotational symmetry so that its mechanical properties are, in general, different along each axis. Orthotropic material are thus anisotropic; their properties depend on direction in which they are measured.
Material is assumed to be homogeneous and isotropic. Material is assumed to be solid and continuous. No internal forces prior to loading (self weight = 0). |