3 - 1 Chapter 3 Materials 3.1 Introduction The selection of...

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Unformatted text preview: 1 Chapter 3 Materials 3.1 Introduction The selection of materials and the process used in fabrication are integral part of the machine design. When we chose materials, we need to consider: strength, rigidity, reliability, durability, extreme conditions (temp, pressure), recyclability, energy, environmental pollution, cost, and availability. 3.2 Engineering Stress-Strain Relationship In the tensile test, Stress: = P/A 0 P: load A 0: Original area Strain: = L/L L: Length change L : Original Length Copy Fig.3.1 and explain it! 3.3 Implementation of Engineering Stress-Strain The Fig.3.2 is the same stress-strain but in different strain scale. 2 Copy Fig.3.2 and compare it with Fig.3.1 Figure 3.1 (p. 80) Engineering stress-strain curve hot rolled 1020 steel. Figure 3.2 (p. 82) Figure 3.1 replotted to linear strain scale. 3 The three abscissa scales in Fig.3.2 have the relation: A L = A final (L + L) = A f L (1+ ) ---------- (1) Then Final Area: A f =A / 1+ ----------- (2) Area Ratio : R = A / A f = 1 + ---------- (3)...
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3 - 1 Chapter 3 Materials 3.1 Introduction The selection of...

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