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 9Alloys for high-temperature use Not tested: in 8.5 Fracture Toughness 8.14 Data extrapolation methods