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Illinois MatSE 280 Introduction to Engineering Materials, Lecture 7: Mechanical Properties

By Duane Douglas Johnson1, Omar N Sobh2

1. Iowa State University (formerly University of Illinois Urbana-Champaign) 2. University of Illinois at Urbana-Champaign

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Mechanical Properties

Why Mechanical Properties?

  • Need to design materials that will withstand applied load and in-service uses for ...
  • Space exploration, Bridges for autos and people, skyscrapers, MEMS devices, Space elevator?


  • Stress and strain
  • Elastic and Plastic Deformation of Metals
  • Strain Testing
  • Hooke’s Law
  • Young’s Modulus, Poisson's ratio, Yield Stress, (Ultimate) Tensile Strength
  • Temperature matters (see Failure)
  • Ductility, Toughness, Resilience
  • Useful Linear Elastic Relationships
  • Complex States of Stress in 3D
  • Ceramics Mechanical Properties
  • Why use True Strain?
  • Hardening, Hardness
  • Account for Variability in Material Properties
  • Design Safety Factors

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Cite this work

Researchers should cite this work as follows:

  • Duane Douglas Johnson; Omar N Sobh (2008), "Illinois MatSE 280 Introduction to Engineering Materials, Lecture 7: Mechanical Properties,"

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