L.P. Pook's Metal Fatigue: What It Is, Why It Matters (Solid Mechanics PDF

By L.P. Pook

ISBN-10: 140205596X

ISBN-13: 9781402055966

ISBN-10: 1402055978

ISBN-13: 9781402055973

This ebook offers very important options in steel fatigue in a simple demeanour, for the good thing about readers who needs to comprehend extra complicated records on quite a lot of steel fatigue subject matters. The textual content indicates how steel fatigue difficulties are solved in engineering perform. The ebook assumes no earlier wisdom of steel fatigue, requiring just a uncomplicated realizing of pressure research and arithmetic coated in engineering undergraduate classes.

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Additional info for Metal Fatigue: What It Is, Why It Matters (Solid Mechanics and Its Applications)

Sample text

13. Repeated sequence of crack opening and closing under a fatigue loading of 0 to σmax . The sequence (a) to (e) is repeated for each successive cycle (Pook and Frost 1973). Reproduced under the terms of the Click-Use Licence. The mechanism of Stage II fatigue crack propagation, and striation formation involves ductile deformation at the crack tip as it opens and closes. 13 for a crack of initial length a, and a fatigue loading of 0 to σmax . When a crack is loaded the tip blunts, and fatigue crack propagation takes place in a ductile metal because unloading resharpens the crack tip on each cycle, leading to an increment of crack propagation δa, as shown schematically in the figure.

1) where Sm is mean reference stress, Sa alternating reference stress, f frequency of load application and t time. The process is statistically stationary in that the coefficients Sm , Sa and f are unaffected by a shift of the origin along the time axis, that is they are independent of time. As the process is cyclic the continuous function S(t) can be replaced by the continuous function S(N), where N is the number of cycles and N = t/f . In metal fatigue, it is the maxima and minima, and the number of cycles (rather than time) which are the main controlling parameters.

At high stress levels, the number of cycles needed to initiate a crack is negligible, so that the S/N curve has the relatively narrow scatter in life associated with Stage II fatigue crack propagation. At low stress levels, the number of cycles needed to propagate the crack is negligible, so that the S/N curve shows the wide scatter in fatigue life associated with fatigue crack initiation. At intermediate stresses, crack initiation and crack propagation are of roughly equal importance and the resultant additive distribution can be bimodal (two-humped).

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Metal Fatigue: What It Is, Why It Matters (Solid Mechanics and Its Applications) by L.P. Pook

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