Mechanical-Failure - CHAPTER 8: Ship-cyclic loading from...

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Chapter 8- 1 Ship-cyclic loading from waves. Computer chip-cyclic thermal loading. Hip implant-cyclic loading from walking. Adapted from Fig. 8.0, Callister 6e. (Fig. 8.0 is by Neil Boenzi, The New York Times .) Adapted from Fig. 18.11W(b), Callister 6e. (Fig. 18.11W(b) is courtesy of National Semiconductor Corporation.) Adapted from Fig. 17.19(b), Callister 6e. CHAPTER 8:
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Chapter 8- Very Ductile Moderately Ductile Brittle Fracture behavior: Large Moderate %AR or %EL : Small 2 • Ductile fracture is desirable! • Classification: Ductile: warning before fracture Brittle: No warnin g Adapted from Fig. 8.1, Callister 6e. DUCTILE VS BRITTLE FAILURE
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Chapter 8- 3 Ductile failure: --one piece --large deformation Brittle failure: --many pieces --small 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. EX: FAILURE OF A PIPE
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Chapter 8- 4 • Evolution to failure: necking void nucleation void growth and linkage shearing at surface fracture σ • Resulting fracture surfaces (steel) 50 μ m particles serve as void nucleation sites. 50 μ m 100 μ m From V.J. Colangelo and F.A. Heiser, Analysis of Metallurgical Failures (2nd ed.), Fig. 11.28, p. 294, John Wiley and Sons, Inc., 1987. (Orig. source: P. Thornton, J. Mater. Sci ., Vol. 6, 1971, pp. 347-56.) Fracture surface of tire cord wire loaded in tension. Courtesy of F. Roehrig, CC Technologies, Dublin, OH. Used with permission. MODERATELY DUCTILE FAILURE
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Chapter 8- 5 Inter granular ( between grains) Intra granular ( within grains) Al Oxide (ceramic) Reprinted w/ permission from "Failure Analysis of Brittle Materials", p. 78. Copyright 1990, The American Ceramic Society, Westerville, OH. (Micrograph by R.M.
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This note was uploaded on 09/04/2011 for the course ME 311 taught by Professor Meyers during the Spring '08 term at University of Texas at Austin.

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Mechanical-Failure - CHAPTER 8: Ship-cyclic loading from...

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