1. SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY
Strength of Material-I
SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY
Strength of Materials-I CE-207 (2+1)
Engr.Muhammad Abbas Qurshi
Engr.Muahmmad Abbas Qureshi

2. Engr.Muhammad Abbas Qurshi
Course Content
Stress & Strain
Statically determinate & Indeterminate Compatibility problems ,compound bars
Shear force & Bending Moment Diagrams
Application of Stress & Strain
Bending in Beam
Stresses in Beam
Deflection in Beam
Principal of superposition
Relation between load, shear force, bending moment
Engr.Muhammad Abbas Qurshi

3. Engr.Muhammad Abbas Qurshi
Course Content
Distribution of shear stresses in beam of symmetrical section
Theory of bending
Deflection of beam using double integration, Moment area and conjugate beam method
Combined bending & direct stress
Torsion of circular section
Recommended Book
Strength of Materials
Andrew Pytel
Ferdinand L. Singer
Engr.Muhammad Abbas Qurshi

4. Engr.Muhammad Abbas Qurshi
Instruction
Bring Text book in every class
Bring Calculator with you
5 min max. tolerance in timing
75% Attendance is mandatory no exception
Submit Assignment in time to Class Representative.
Engr.Muhammad Abbas Qurshi

5. ENGINEERING MECHANICS
MECHANICS OF SOLIDS
STATICS
DYNAMICS
Engr.Muhammad Abbas Qurshi

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Static
Dynamic
Strength of Materials
Study of External Effects on Rigid body
Study of internal affects
Engr.Muhammad Abbas Qurshi

7. DIFFERENT NAME OF SUBJECT
Strength of Materials
Mechanics of Materials
Mechanic of Deformable bodies
Mechanics of Solids
Engr.Muhammad Abbas Qurshi

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All branches of Engineering deal with physical systems, the component parts of which are to be assigned definite physical sizes, fabricated from some materials.
Engr.Muhammad Abbas Qurshi

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Appropriate sizing is necessary for these part to safely withstand the imposed forces on them and at optimal cost. (Design)
Engr.Muhammad Abbas Qurshi

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It is essential to study the behavior of the material from strength and deformation point of view as well as characteristics of different kind of forces, which cause different type of stresses in the material.
Engr.Muhammad Abbas Qurshi

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Definition
The subject that deals with the analytical determination of strength , deformation characteristics(Stiffness) and stability of different members is designated as “Strength of Materials”
Strength
Stiffness
Stability
Engr.Muhammad Abbas Qurshi

12. Engr.Muhammad Abbas Qurshi
Units
SI units
The basic units in this system are:
Metre(m) for length
Kilogram(Kg) for mass; and
Second (s) for time
Engr.Muhammad Abbas Qurshi

13. Engr.Muhammad Abbas Qurshi
Derived Units
Area (m2)
Velocity (m/s)
Acceleration (m/s2)
Force (kg. m/s Newton. N)
Stress (Force/Unit Area)
P/A = N/m2 Pa (Pascal)
Kpa=103 Pa Mpa =106 pa
1N/mm N/m2 (106 Pa)
Engr.Muhammad Abbas Qurshi

14. Engr.Muhammad Abbas Qurshi
Forces
Body Force
The body force act throughout the body and
associated with the units of volume of body.
(Distributed over the volume of system but when we analyze we say it acts through the center of gravity)
Gravitational force
Inertial force
Magnetic force
Engr.Muhammad Abbas Qurshi

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Surface Force
The surface force act on the surface or area elements of the body.(Could be concentrated force or distributed force)
Surface traction (act on boundary)
Engr.Muhammad Abbas Qurshi

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Internal Force
To know internal force we must know the concept of freebody diagram
Free body diagram can be of section or complete member
Idealized line diagram
Applied forces
Reaction at section
Engr.Muhammad Abbas Qurshi

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Stress
Stress is the expression of force applied to a unit area of surface. It is measured in psi (English unit) or in MPa (SI unit).
stress = force / area
Engr.Muhammad Abbas Qurshi

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Simple Stresses
There are three types of simple stress namely; normal stress, shearing stress, and bearing stress.
Engr.Muhammad Abbas Qurshi

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Normal Stress
The resisting area is perpendicular to the applied force, thus normal. There are two types of normal stresses;
tensile stress and
compressive stress.
Tensile stress applied to bar tends the bar to elongate while
compressive stress tend to shorten the bar.
б =P/A
where
P is the applied normal load
A is the area
Engr.Muhammad Abbas Qurshi

20. Engr.Muhammad Abbas Qurshi
Dividing the load by area does not give the stress at all points in the cross-sectional area; it merely determines the average stress.
A more precise definition of Stress is obtained by dividing the differential load by the differential area over which it acts:
б= dP/dA
Engr.Muhammad Abbas Qurshi

21. Engr.Muhammad Abbas Qurshi
QUESTIONS
What are the units of ‘Force' and ‘Stress’ in both systems?.
What is the definition of ‘Normal Stress’?.
What is meant by ‘free-body diagram’?.
What are different name of subject?.
Why we study this subject?.
Engr.Muhammad Abbas Qurshi