1. Introduction to
Strength of Materials
Lecturer;
MOHD FIRASATH ALI

2. Content of the course Diagrams in Statically Determinate Beams
¢  Simple Stress and Strain
¢  Shear Force and Bending Moment
Diagrams in Statically Determinate
Beams
¢  Stresses in Beams
¢  Torsion 2

3. Statics
Engineering
Mechanics
Dynamics
Mechanics
of Materials 3

4. Study of EXTERNAL effects on Rigid bodies Study of INTERNAL
effects and
Deformations that are
caused by the Applied
loads 4

5. of Materials of of Materials Bodies of Solids Mechanics Strength
Deformable
Bodies
Mechanic of
Materials
Strength of
Materials
Mechanics
of Solids 5

6. with physical systems, the component parts of which are to
¢ All branches of Engineering deal
with physical systems, the
component parts of which are to
be assigend definite physical
sizes, fabricated from some
materials! 6

7. for these parts of safety withstand the imposed forces on them and
¢ Appropriate sizing is necessary
for these parts of safety withstand
the imposed forces on them and
at an optimal cost.
¢ DESIGN! 7
Strenght of Materials I - DAT

8. behavior of material from the strength and deformation
¢ It is essential to study the
behavior of material from the
strength and deformation
point of view, as well as the
characterization of different
kinds of forces, which cause
different types of stresses in
the material. 8
Strenght of Materials I - DAT

9. the analytical deformation of the strength, deformation
¢ The subject, which deals with
the analytical deformation of
the strength, deformation
characteristics (stiffness) and
stability of different members,
is normally designated as the
Strength of Materials . 9
Strenght of Materials I - DAT

10. Characteristics of Strength of Materials
Stiffness
Stability 10
Strenght of Materials I - DAT

11. Historical Aspects of 17 Centry. developed theory of columns.
¢  Galileo, Leonardo-Da-Vinci, Eraly part
of 17 Centry. th
¢   Leonard Euler ( )
developed theory of columns.
¢  French investigators like, to name a
few Cauchy, Nervier, Poisson,
Coulomb, St. Venant and several
others. 11
Strenght of Materials I - DAT

12. Specific Objectives It is expected that one should be in a
position to understand
¢  The classification of different kinds of
forces that structural components are
subjected to.
¢  Effects of different forces on such
components and their solution
techniques.
¢  Different types of stresses and
deformations that develop due to forces 12
Strenght of Materials I - DAT

13. Scope The scope of this particular course includes;
¢  Identification of different types of
forces that the structural components
will be subjected to.
¢  Systematic evaluation of the effects of
these forces on such structural
components. 13
Strenght of Materials I - DAT

14. Approach engineering applications. govern that govern equilibrium of
¢  Mainly confined to material useful to
engineering applications.
¢  Laws of Newtonian mechanics that
govern that govern equilibrium of
forces.
¢  Essential to know the mechanical
characteristics of the materials with
which the member will be fabricated. 14
Strenght of Materials I - DAT

15. Units SI units will be used in this particular course.
l Meter (m) for length
l Kilogram (kg) for mass
l Second (s) for time 15
Strenght of Materials I - DAT

16. Derived Units How to derive the units of the following: l Area ?
l Velocity ?
l Acceleration ?
l Force ? 16
Strenght of Materials I - DAT

17. Body forces The body forces act throughout
the body and associated with the
units of volume of the body,
l Gravitational force
l Inertia force
l Magnetic force 17
Strenght of Materials I - DAT

18. Surface Forces or area elements of a body
¢  The surface forces act on the surfaces
or area elements of a body 18
Strenght of Materials I - DAT

19. Internal Forces 19
Strenght of Materials I - DAT

20. Internal forces
¢  Free body diagrams 20
Strenght of Materials I - DAT

21. Concept of Stress ¢ Direction of Stresses ¢ Shear Stresses
¢  Normal Stresses
l  Tensile
l  Compression 21
Strenght of Materials I - DAT

22. respective areas on which they act give us the forces and at section
¢  Stresses multiplied by the
respective areas on which they act
give us the forces and at section
the vector sum of these forces is
known as the stress resultant keep
a body in equilibrium. 22
Strenght of Materials I - DAT

23. Example 1
Draw Free-Body Diagram 23
Strenght of Materials I - DAT

24. Example 2
Draw Free-Body Diagram 24
Strenght of Materials I - DAT

25. Summery The lessen include: of the subject
l A general idea about the scope
of the subject
l Typical application areas
l Concept of different forces
l Concept of free-body diagram
l Concept of Stress 25
Strenght of Materials I - DAT

26. Thank You 26
Strenght of Materials I - DAT