Chapter 8.1

Chapter 8.1 - Chapter Outline: Failure How do Materials...

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1 MSE 2090: Introduction to Materials Science Chapter 8, Failure How do Materials Break? Chapter Outline: Failure ± Ductile vs. brittle fracture ± Principles of fracture mechanics 9 Stress concentration ± Impact fracture testing ± Fatigue (cyclic stresses) 9 Cyclic stresses, the S—N curve 9 Crack initiation and propagation 9 Factors that affect fatigue behavior ± Creep (time dependent deformation) 9 Stress and temperature effects 9 Alloys for high-temperature use Not tested: in 8.5 Fracture Toughness 8.14 Data extrapolation methods
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2 MSE 2090: Introduction to Materials Science Chapter 8, Failure Fracture: separation of a body into pieces due to stress, at temperatures below the melting point. Steps in fracture: ¾ crack formation ¾ crack propagation Fracture Depending on the ability of material to undergo plastic deformation before the fracture two fracture modes can be defined - ductile or brittle Ductile fracture - most metals (not too cold): ¾ Extensive plastic deformation ahead of crack ¾
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 8.1 - Chapter Outline: Failure How do Materials...

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