SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

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SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY. Strength of Materials-I CE-207 (2+1 ). Course Content. Stress & Strain Statically determinate & Indeterminate Compatibility problems ,compound bars Shear force & Bending Moment Diagrams Application of Stress & Strain Bending in Beam - PowerPoint PPT Presentation

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Page 1: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Engr.Muhammad Abbas Qurshi

SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Strength of Materials-ICE-207(2+1)

Page 2: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

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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 BookStrength of Materials• Andrew Pytel• Ferdinand L. Singer

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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.

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Engr.Muhammad Abbas Qurshi

ENGINEERING MECHANICS

STATICS DYNAMICS MECHANICS OF SOLIDS

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Engr.Muhammad Abbas Qurshi

• Static• Dynamic

• Strength of Materials

Study of External Effects on Rigid body

Study of internal affects

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Engr.Muhammad Abbas Qurshi

DIFFERENT NAME OF SUBJECT

Strength of Materials

Mechanics of Materials

Mechanic of Deformable bodies

Mechanics of Solids

Page 8: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Engr.Muhammad Abbas Qurshi

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

Page 9: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Engr.Muhammad Abbas Qurshi

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

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Engr.Muhammad Abbas Qurshi

• 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.

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Engr.Muhammad Abbas Qurshi

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

Page 12: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

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Engr.Muhammad Abbas Qurshi

Derived Units

• Area (m2)• Velocity (m/s)• Acceleration (m/s2)• Force (kg. m/s2 Newton. N) • Stress (Force/Unit Area)

P/A = N/m2 Pa (Pascal)Kpa=103 Pa Mpa =106 pa1N/mm2 106 N/m2 (106 Pa)

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Engr.Muhammad Abbas Qurshi

Forces

Body ForceThe body force act throughout the body andassociated 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

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Engr.Muhammad Abbas Qurshi

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)

Page 16: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Engr.Muhammad Abbas Qurshi

Internal Force

• To know internal force we must know the concept of freebody diagramFree body diagram can be of section or complete member– Idealized line diagram– Applied forces– Reaction at section

Page 17: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

Engr.Muhammad Abbas Qurshi

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

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Engr.Muhammad Abbas Qurshi

Simple Stresses

• There are three types of simple stress namely; normal stress, shearing stress, and bearing stress.

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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 whilecompressive stress tend to shorten the bar.

б =P/Awhere

P is the applied normal load A is the area

Engr.Muhammad Abbas Qurshi

Page 20: SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

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Engr.Muhammad Abbas Qurshi

QUESTIONS

1. What are the units of ‘Force' and ‘Stress’ in both systems?.

2. What is the definition of ‘Normal Stress’?.3. What is meant by ‘free-body diagram’?.4. What are different name of subject?.5. Why we study this subject?.