lecture2

lecture2 - ENGR 2220 Structure & Properties of Materials...

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ENGR 2220 – Structure & Properties of Materials Lecture 2 Mechanical properties of metals: Chapter 6
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ISSUES TO ADDRESS. .. Stress and strain : What are they and why are they used instead of load and deformation? Elastic behavior: When loads are small, how much deformation occurs? What materials deform least? Toughness and ductility : What are they and how do we measure them? CHAPTER 6: MECHANICAL PROPERTIES
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Tensile stress, σ : Shear stress, τ : Stress has units: N/m 2 or lb/in 2 ENGINEERING STRESS
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Units of Stress 1 pascal (Pa) = 1 = 1 1 N = 1 2 ms kg 2 m N 2 . s m kg
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Stress Strain Relationship ε σ = E o A F = o o o i l l l l l Δ = = E is modulus of Elasticity or Young’s modulus = E
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Hook's Law - Springs 0 2 4 6 8 10 12 14 048 x Force
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Elastic Deformation Linear & Non-linear ε σ = E
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• Typical tensile specimen • Other types of tests: --compression: brittle materials (e.g., concrete) --torsion: cylindrical tubes, shafts. • Typical tensile test machine Adapted from Fig. 6.2, Callister 6e. Adapted from Fig. 6.3, (Fig. 6.3 is taken from H.W. Hayden, W.G. Moffatt, and J. Wulff,
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This note was uploaded on 10/29/2008 for the course ENGR 2220 taught by Professor Rizvi during the Fall '08 term at UOIT.

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lecture2 - ENGR 2220 Structure & Properties of Materials...

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