Strength of Materials

1. STRESS-STRAIN CURVE,
SHEAR FORCE AND
BENDING MOMENT
PRESENTED BY:
HAMZA KHAN (015)
UMER BIN KHALID (014)
HARIS RAFIQ (035)
Department OF Civil Engineering
COMSATS Institute Of Information Technology,

2. Table of Contents
 Stress-Strain Curve
• Stress
• Strain
• Ductile and Brittle Curve
 Shear Force and Bending Moment
• Beams
• Supports and Reactions
• SFD and BMD

3. What Is Stress?
 Stress is defined as
the force per unit area
of a material.
 i.e. stress = force /
cross sectional area
 A tension or
compression stress
created in a structural
member by the
application of a
lengthwise load.

4. What Is Strain?
 Strain is defined as
extension or reduction per
unit length.
 Strain = extension /
original length
 Increase (or decrease) in
length resulting from a
stress acting parallel to the
longitudinal axis of the
specimen.

5. Stress-Strain Curve
Typical regions that
can be observed in a
stress-strain curve
are:
 Elastic region
 Yielding
 Strain Hardening
 Necking and
Failure

6. Stress-Strain Curve
BRITTLE MATERIAL DUCTILE MATERIAL

7. Beams
 The beams are
defined as:
“A structural element
that is capable of
withstanding load
primarily by resisting
against bending.”
 Beams are
horizontal members

8. Supports and Reactions

9. TYPES OF LOADS THAT ACTS
ON BEAM
There are primarily three types of loads acting
on the beam
 Point load
 Uniformly distributed load
 Uniformly varying load

10. Shear Force and Bending
Moment
 Shear Force:
It is the algebraic sum of the left or right of
the cut section.
 Bending Moment:
It is the algebraic sum of the moment of the
forces to the left or to the right of the cut
section.

11.  Reactions
 Shear Force Diagram
 Bending Moment Diagram

12.  Reactions
 Shear Force Diagram
 Bending Moment Diagram

13.  Reactions
 Shear Force Diagram
 Bending Moment Diagram

14. SHEAR FORCE AND BENDING
MOMENT DIAGRAM