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 :
  • Analyze two dimensional basic stress, strain, and axial loading problems.
  • Solve torsion problems of circular shafts as solid or hollow bars.
  • Analyze beam of different cross sections to meet design requirements.
  • Develop or analyze a basic design or mechanical part under combined loading by computing principal stresses and/or applying failure theories.
Programme Outcomes:
  • Ability to acquire and apply fundamental principles of science and engineering(60%)
  • 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 work effectively as an individual, and as a member/leader in a team(10%)
Assessment Scheme:
  • Lab Experiments - work in group, lab report writing, oral assessment at the end of lab (10%)
  • Tutorial / Assignment - group/ individual assignment,focus group discussion at tutorial,to enhance understanding of basic concepts in lecture(15%)
  • Test Quiz - written exam (15%)
  • Final Exam - written exam (60%)
Teaching and Learning Activities: 54 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

  • Concept of Stress, Strain and Axial Loading

  • Tensile, compressive, shear and bearing stresses. Concept of strain. Design Consideration.Generalized Hookeís law. Lateral strain and Poissonís ratio. Axial Loading. Application to statistically determinate and indeterminate problems.Saint Venantís Principle.
     
  • Torsion

  • Torsion of circular shafts, solid and hollow. Maximum shear stress of shaft under torsion. Determinate and indeterminate problems.
     
  • Pure Bending and Transverse Loading

  • Bending moments and shear force. Singularity functions. Flexural formula. Economic sections. Shear flow, and shear stress in beam.
     
  • Deflection of Beams

  • Deformation of beam under Transverse Loading. Slope and deflection by direct integration method, energy methods and Castigliano's theorem.
     
  • Stress Transformation and Combined Loading

  • Biaxial stresses and corresponding strains. Mohrís circle for plane stress.Principal Stresses. Tresca and Von Mises Criteria for Ductile Material under plane stress and Maximum Normal Stress Criterion for Brittle Material
     
  • Yield Criteria

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

Laboratory

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