Fatigue and Fracture Mechanics of High Risk Parts

Preface. About the authors. Contents. A brief introduction to fatigue and fracture mechanics. Conventional fatigue (high and low cycle fatigue). Background. Cyclic or fluctuating load. Fatigue spectrum. The S-N diagram. Constant-life diagrams. Linear cumulative damage. Crack initiation and stable crack growth. Low cycle fatigue and the strain-controlled approach. The conventional or engineering stress-strain curve. The natural or true stress-strain curve and hysteresis loop. Cyclic stress-strain curve. Strain-life prediction models. Universal slope method. References. Linear elastic fracture mechanics (LEFM). Energy balance approach (the Griffith theory of fracture). The stress intensity factor approach. Fracture Toughness. Residual strength of a cracked structure. Plasticity at the crack tip. Plastic zone shape based on the Von Mises's yield criterion. Surface or part through cracks. References. Fatigue crack growth. Introduction to fatigue crack growth. Crack growth rate empirical descriptions. Crack closure phenomenon. Variable amplitude stress and the retardation phenomenon. Cycle by cycle fatigue crack growth analysis. Structural integrity Analysis of a bolted joint under cyclic loading. References. Fracture control program and non-destructive inspection. Introduction. Fracture control plan. Non-destructive inspection (NDI) for safe-life assessment. References. Fracture mechanics of ductile metals (FMDM) theory and the ASTM fracture toughness test. Introduction. Fracture mechanics of ductile metals (FMDM). Determination of terms. Octahedral shear stress theory (plane stress conditions). Octahedral shear stress theory (plane strain conditions). applied stress, and half crack length, relationship. Mixed mode fracture and thickness parameters. The stress-strain curve. Verification of FMDM results with the experimental data. Brief description of ASTM fracture toughness determination. Appendixes. Subject index.