By L.P. Pook
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Extra resources for Metal fatigue : what it is, why it matters
6(a). 1) occurs when a broad band random signal is applied to a sharply tuned resonant system. Individual sinusoidal cycles appear, whose frequency corresponds to the natural frequency of the resonant system. The cycles have a slowly varying random amplitude and the irregularity factor tends to one as the system is increasingly sharply tuned. 99. In metal fatigue, the distribution of peak values is usually of interest. 7(a), and is given by the Rayleigh distribution 42 Chapter 4: Variable Amplitude and Multiaxial Fatigue p S σ = S −S 2 exp σ 2σ 2 .
Such standards are often incorporated in software and are sometimes insisted upon by regulatory authorities. An attempt to list all the documents issued by the British Standards Institution which contained fatigue clauses included more than 300 items (Pook 1989a). Lists of metal fatigue standards and related software are not included in this book because such lists would date rapidly. 1 Notation A constant amplitude fatigue loading (or constant amplitude loading) is a fatigue loading in which all the load cycles are identical.
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.