8/3/2019 Mechanics of Materials Class Notes

1/20

Mechanics of materials

Hareesha N G

LecturerDepartment of Aeronautical Engg

8/3/2019 Mechanics of Materials Class Notes

2/20

Introduction

Mechanics of materials is a branch of applied

mechanics that deals with the behavior of solid

bodies subjected to various types of loading

A thorough understanding of mechanical

behavior is essential for the safe design of all

structures

Mechanics of materials is a basic subject in

many engineering fields

8/3/2019 Mechanics of Materials Class Notes

3/20

Strength

Strength is the ability of a material to resist

deformation. The strength of a component is

usually considered based on the maximum

load that can bear before failure is apparent.

8/3/2019 Mechanics of Materials Class Notes

4/20

Basic concepts

Load

Force

Weight Mass

System of units

SI, MKS, CGS,IPS, FPS

8/3/2019 Mechanics of Materials Class Notes

5/20

Load

Types of load - Point load, UDL, UVL

Types of Load - Static load or dynamic

Sign convention for loads Compressive load,Tensile load

Types of loads - Tangential load, Normal

8/3/2019 Mechanics of Materials Class Notes

6/20

Stress

The intensity of force (that is, the force per

unit area) is called the STRESS

Unit ofStress N/mm2 (Pascal) (commonly denoted by the Greek letter ).

Difference between stress and pressure??

A

P!W

8/3/2019 Mechanics of Materials Class Notes

7/20

Difference between pressure and

stress

We know that every materials is elastic innature , so when a force is applied it tends todeform and due to this deformation , there is

an internal resistance produced which tends tospring back the molecules to their originalposition and this internal resistance per unitarea is know as STRESS .

Pressure is nothing but force acting on a unitarea .

8/3/2019 Mechanics of Materials Class Notes

8/20

Types ofStress

Residual stresses

Pressure Stress

Thermal Stress Fatigue Stress

Tensile Stress

Compressive Stress

Shear Stress

8/3/2019 Mechanics of Materials Class Notes

9/20

8/3/2019 Mechanics of Materials Class Notes

10/20

8/3/2019 Mechanics of Materials Class Notes

11/20

8/3/2019 Mechanics of Materials Class Notes

12/20

8/3/2019 Mechanics of Materials Class Notes

13/20

8/3/2019 Mechanics of Materials Class Notes

14/20

8/3/2019 Mechanics of Materials Class Notes

15/20

8/3/2019 Mechanics of Materials Class Notes

16/20

8/3/2019 Mechanics of Materials Class Notes

17/20

8/3/2019 Mechanics of Materials Class Notes

18/20

8/3/2019 Mechanics of Materials Class Notes

19/20

8/3/2019 Mechanics of Materials Class Notes

20/20