Chapter 8 Part 2 - ANNOUNCEMENTS - 3/22 Reading: Chapter 8...

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ANNOUNCEMENTS - 3/22 Chapter 8 - 1 Reading: Chapter 8 Homework #7 8.2, 8.8, 8.10, 8.13, 8.17, 8.20, 8.27 due Thursday, March 29 2 nd Midterm Thursday, April 5, to and includes Chapter 8
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Loading Rate • Increased loading rate. .. -- increases σ y and TS -- decreases % EL •Wh y? An increased rate gives less time for dislocations to move past obstacles. σ ε σ y σ y TS TS larger ε smaller ε Chapter 8 -
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Impact Test Chapter 8 - 3 final height initial height • Impact loading: -- severe testing case -- makes material more brittle -- decreases toughness Adapted from Fig. 8.12(b), Callister 7e. (Fig. 8.12(b) is adapted from H.W. Hayden, W.G. Moffatt, and J. Wulff, The Structure and Properties of Materials , Vol. III, Mechanical Behavior , John Wiley and Sons, Inc. (1965) p. 13.) (Charpy) Applications: car collision, rain erosion on airplane, anti- armor projectile
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Temperature Effect Increasing temperature. . (high temperature promotes diffusion and relaxes stresses) increases % EL and K c Ductile-to-Brittle Transition Temperature (DBTT) ... Chapter 8 - 4 BCC metals (e.g., iron at T < 914°C), or HCP metals Impact Energy Temperature High strength materials ( σ y > E /150) polymers More Ductile Brittle Ductile-to-brittle transition temperature FCC metals (e.g., Cu, Ni) Adapted from Fig. 8.15, Callister 7e.
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Design Strategy: Stay Above The DBTT! • Pre-WWII: The Titanic Reprinted w/ permission from R.W. Hertzberg, "Deformation and Fracture Mechanics of Engineering Materials", (4th ed.) Fig. 7.1(a), p. 262, John Wiley and Sons, Inc., 1996. (Orig. source: Dr. Robert D. Ballard,
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This note was uploaded on 07/13/2008 for the course MSE 201 taught by Professor Nieh during the Spring '07 term at University of Tennessee.

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Chapter 8 Part 2 - ANNOUNCEMENTS - 3/22 Reading: Chapter 8...

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