Strength of Materials
 
 
Subject Code: EME1066
Aim of Subject: To introduce to the students the strength and basic characteristics of materials for proper applications in the industry.
Learning Outcome of Subject: At the completion of the subject, students should be able to :
  • Understand basic stress and strain in materials for two dimensional analysis.
  • Solve torsion problems of circular shafts as solid or hollow bar.
  • Understand the basic equation of mechanical design by calculating maximum shear stress of shaft under torsion and maximum bending stress in beams.
  • Plot and visualize the shear and bending stress in mechanical structure under different loads.
  • Develop a basic design of a mechanical part by using theory of failures.
Programme Outcomes:
  • Ability to acquire and apply fundamental principles of science and engineering(50%)
  • Capability to communicate effectively(10%)
  • Acquisition of technical competence in specialised areas of engineering discipline(10%)
  • Ability to identify, formulate and model problems and find engineering solutions based on a systems approach(10%)
  • Ability to conduct research in chosen fields of engineering(10%)
  • Ability to work independently as well as with others in a team(10%)
Assessment Scheme:
  • Lab Experiments - work in groups, lab report writing, oral assessment at the end of lab (15%)
  • Tutorial / Assignment - group assignment,focus group discussion at tutorial,to enhance understanding of basic concepts in lecture(10%)
  • Test Quiz - written exam (15%)
  • Final Exam - written exam (60%)
Teaching and Learning Activities: 51 hours (lectures,tutorials and laboratory experiment)
Credit Hours: 3
Pre-Requisite: EME1016 Applied Statics
References:
  • Ferdinand P. Beer, E. Russell Johnston, Jr. & John T. DeWolf, “Mechanics of materials”, 3rd edition, McGraw-Hill, 2005. (Textbook)
  • R.S Khurmi, “Strength of materials”, S. Chand & company LTD. 2001

Subject Contents

  • Simple Stress and Strain

    • Tensile, compressive, shear and bearing stresses. Hooke’s law. Lateral strain and Poisson’s ratio. General stress-strain relationships. Application to statistically determinate and indeterminate problems.
     
  • Torsion

    • Torsion of circular shafts, solid and hollow. Maximum shear stress of shaft under torsion. Torsion of shaft under various conditions. Closed-coiled helical spring, shear stress and deflection. Springs in series and in parallel.
     
  • Bending of Beams

    • Bending moments and shear force. Flexural formula. Economic sections. Determinate and indeterminate problems. Slope and deflection by direct integration method, singularity functions, area moment and energy methods. Castigliano's theorem.
     
  • Stress Transformation

    • Biaxial stresses and corresponding strains. Mohr’s circle for stress.
     
  • Yield Criteria

    • Maximum normal stress, maximum shear stress and distortion energy. Von Mises criteria.
     

Laboratory

1. Young's experiment
2. Torsion of round bars