ASM Handbook, Volume 19: Fatigue and Fracture by ASM (American Society for Metals)

By ASM (American Society for Metals)

Delivering a operating wisdom of fatigue and fracture houses in real engineering perform, this guide is principally helpful in comparing try information and understanding the main variables that impact effects. it's going to additionally provide you with a greater figuring out of fracture mechanics to help you in lifestyles overview and lifestyles extension of parts. Sections contain: Fatigue Mechanisms, Crack development, checking out, Engineering elements of Fatigue existence, Fracture Mechanics of Engineering fabrics, Fatigue and Fracture keep watch over, Castings, Weldments, Wrought Steels, Aluminum Alloys, Titanium Alloys and Superalloys. Appendices comprise entire assurance of fatigue power parameters and stress-intensity elements.

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Use of the stressintensity values and appropriate data (properties) allows the number of cycles of crack growth over a range of crack sizes to be estimated and fracture to be predicted. The clear tie of crack size, orientation, and geometry to nondestructive evaluation (NDE) is also a plus. Disadvantages are: possibly computationally intensive stress-intensity factor determinations, greater complexity in development and modeling of property data, and the necessity to perform numerical integration to determine crack growth.

45C-Ni-Cr-Mo steels (Ref 32). In Fig. 18(b) the embrittling effect of sulfur results from the dimple formation at sulfides. Finally, note that d in Eq 10 and in Eq 9 are essentially equivalent. Fig. 17 Model of static crack advance after Schwalbe (Ref 29). The crack-tip opening displacement is equal to the dimple spacing or inclusion spacing. Fig. 18 (a) Fracture toughness of some aluminum alloys vs. volume fraction of inclusions. 45C-Ni-Cr-Mo steels as a function of sulfur content and tensile strength Similar relationships are discussed by Hahn (Ref 33), who has examined the relationships between particle size, particle spacing, and the results of tensile tests, Charpy V-notch impact tests (CVN), and fracture toughness (KIc) results.

Creep-fatigue interactions can alter an assumed "simple" fatigue situation to a considerable degree. Plastics and composites also can be approached in this manner (Fig. 15). Orientation effects can dominate this response, and loading must be carefully considered. Two strain-life plots show varying responses in fiber-reinforced composites in Fig. 15. Fig. 14 Low-cycle fatigue curves for superalloys at 850 °C (1560 °F). Superalloys used under high-load, hightemperature situations are frequently characterized in the safe-life, finite-life regime.

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