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Stuff to know for Test 2

# Stuff to know for Test 2 - EMSE 201 Introduction to...

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EMSE 201 – Introduction to Materials Science and Engineering Fall 2010 1 of 4 Stuff to know for Test 2 Here are the topics from the second five weeks of class that you should know for Test #2. Updates for this semester are in green italic boldface. Overheads: Tensile Testing C&R, Chapter 7: §7.1-7.3; 7.5-7.6; 7.8; 7.11; 7.16-7.18 Definitions: engineering stress (eq. 7.1) engineering strain (eq. 7.2) Poisson’s ratio (eq. 7.8) — note: applies only in the elastic range of the curve %EL (eq. 7.11) and %RA (eq. 7.12) Properties from the engineering stress-strain curve: proportional limit yield strength, σ y ultimate tensile strength, σ ut modulus of elasticity (Young’s modulus), E strain to failure, ε f modulus of resilience (Overheads, p. 9. 11 ; eqs. 7.13, 7.14, Figure 7.15) modulus of toughness (Overheads, p. 9. 11 ; C&R p. 207 and Figure 7.13.) Hooke’s law (eqs. 7.5, 7.10) Relation of Young’s modulus to the interatomic force curve: eq. 7.6 and Fig. 7.7 (which also refers back to Fig. 2.8) Necking — What is it? How can we tell, from the engineering stress-strain curve, the point at which necking began? (Fig. 7.11) Hardness (see also “Notes on hardness testing” at the “Course Documents” page of the Blackboard website) What is it? Characteristics (similarities and differences) of common hardness tests (Brinell; Rockwell; Knoop; Vickers) (Table 7.5). What are the advantages and disadvantages of the different tests? Correlations with mechanical properties (i.e., have a qualitative understanding of Figs. 7.30 and 7.31) and limitations of those correlations (pp. 226-227) Typical mechanical properties ( E, σ y , σ ut , ε f ) of engineering metals, ceramic, and polymers (one significant digit and order of magnitude) (Overheads, p. 9. 12 )

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EMSE 201 – Introduction to Materials Science and Engineering Fall 2010 2 of 4 Overheads: Slip C&R, Chapter 8: §8.1-8.7
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