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SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

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SWEDISH COLLEGE OF ENGINEERING & TECHNOLOGY

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

  2. 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. 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. 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

  6. 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

  8. 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

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

  10. 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

  11. 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. 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. Derived Units • Area (m2) • Velocity (m/s) • Acceleration (m/s2) • Force (kg. m/s2Newton. N) • Stress (Force/Unit Area) P/A = N/m2 Pa (Pascal) Kpa=103 Pa Mpa =106 pa 1N/mm2 106 N/m2 (106 Pa) Engr.Muhammad Abbas Qurshi

  14. 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

  15. 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

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

  17. 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

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

  19. 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.MuhammadAbbasQurshi

  20. 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. 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

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