Chapter 8 Part 1 - ANNOUNCEMENTS - 3/20 Reading: Chapter 8...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
ANNOUNCEMENTS - 3/20 Reading: Chapter 8 Homework #6 7.1, 7.7, 7.9, 7.13, 7.23, 7.29, 7.30, 7.38 Is due today, March 20 Chapter 8 - 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Artificial Heart Human heart beats about 4 million times per year. Chapter 8 - 2
Background image of page 2
Chapter 8: Mechanical Failure ISSUES TO ADDRESS. .. • How do flaws in a material initiate failure? • How is fracture resistance quantified; how do different material classes compare? Chapter 8 - 3 • How do we estimate the stress to fracture? • How do loading rate, loading history, and temperature affect the failure stress? Ship-cyclic loading from waves. Computer chip-cyclic thermal loading. Hip implant-cyclic loading from walking. Adapted from Fig. 22.30(b), Callister 7e. (Fig. 22.30(b) is courtesy of National Semiconductor Corporation.) Adapted from Fig. 22.26(b), Callister 7e. Adapted from chapter-opening photograph, Chapter 8, Callister 7e. (by Neil Boenzi, The New York Times .)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fracture mechanisms • Ductile fracture – Occurs with plastic deformation • Brittle fracture – Little or no plastic deformation (elastic) – Catastrophic Chapter 8 - 4
Background image of page 4
Ductile vs Brittle Failure • Ductile fracture is usually desirable! Adapted from Fig. 8.1, Callister 7e. • Classification: Ductile: warning before fracture Brittle: No warning Very Ductile Moderately Ductile Brittle Fracture behavior: Large Moderate % AR or % EL Small Chapter 8 - 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example: Burst of a Pipe Ductile failure: --one piece --large deformation Figures from V.J. Colangelo and F.A. Heiser, Analysis of Metallurgical Failures (2nd ed.), Fig. 4.1(a) and (b), p. 66 John Wiley and Sons, Inc., 1987. Used with permission. Brittle failure: --many pieces --small deformation Chapter 8 - 6
Background image of page 6
Moderately Ductile Failure • Evolution to failure: void growth and linkage Chapter 8 - 7 • Resulting fracture surfaces (steel) 50 mm particles serve as void nucleation sites.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 19

Chapter 8 Part 1 - ANNOUNCEMENTS - 3/20 Reading: Chapter 8...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online