Gigacycle Fatigue in Mechanical Practice

Gigacycle Fatigue in Mechanical Practice

Gigacycle Fatigue in Mechanical Practice

Gigacycle Fatigue in Mechanical Practice

Synopsis

Written by pioneers in the study and analysis of very high cycle fatigue this text brings together the most recent findings on gigacycle fatigue phenomena, focusing on improving the reliability and performance of key engine and machine components. This reference reflects the explosion of new concepts, testing methods, and data on very high cycle fatigue and collects the latest analytical methods and results from renowned authorities on the subject. The authors showcase recently developed technologies for improving performance and prevent fatigue in long-life cars, aircraft engines, high-speed trains, commercial power generators, and ships.

Excerpt

The photos of locomotives on the cover of this book illustrate the time period of interest in significant studies of metal fatigue. The older Stephenson Locomotive 020 of 1833, displayed at the CNAM museum in Paris, is an example from the era of first recognition of fatigue. The French TGV high speed trains of the late 20th century evolved this interest into the “gigacycle regime”.

Therefore, over 150 years ago, A. Wohler began his studies of metal fatigue for application to rail car axles. Others, such as Bauschinger, also examined fatigue phenomena later in the 19th century but were limited by the test equipment and instrumentation available. At about the beginning of the 20th century, it was found that initiation of fatigue from a smooth surface was preceded by plastic slip and later by reversals of this slip at the surface to form an intrusion leading to a crack growing failure. It was thereafter frequently concluded that below a certain stress level-the so called “endurance limit”-this reversing slip and/or crack initiation would not occur and fatigue failure could be avoided. This concept assumed that fatigue crack initiation from imperfec-

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