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Chapter 11:
Fatigue
Abstract
Fatigue is a process in which material strength is degraded under fluctuating or continuous load with time. Cyclic fatigue is a phenomenon in which premature failure occurs with time in the presence of fluctuating load, or stress reversal. Stress reversal does not need to be full tension to compression; any fluctuating load about a nominal value can cause a degree of cyclic fatigue. Static fatigue, on the other hand, is a phenomenon in which premature failure occurs with time under a constant, nonfluctuating load in the presence of a chemically active environment. Static fatigue is associated with slow crack growth and is more properly known as stress corrosion. Corrosion fatigue is a fracture that occurs under a combination of both cyclic fatigue and stress corrosion.
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CHAPTER 11
20 PAGES


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