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- W2000042834 abstract "Abstract Failure due to fatigue consists of such macroscopic events as crack initiation and propagation. Microscopic events including microcrack nucleation, microcrack growth and coalescence of some of the microcracks are also important in that such crack interactions can be considered to contribute to the development of a critical defect, i.e. a defect which can self propagate and lead to failure. Since crack initiation is important at high cycles, this paper considers a microcrack and computes its growth to advance a high cycle stress-life (S-Nf) formulation for metals and alloys based on crack initiation. In addition to a material's Burgers' vector and grain size, an indirect effort is also made to include the role of its propensity to cracking through a ratio S(σ I ) S(σ f ) , where S(σI) and S(σf) simply represent steady state crack spacings at stress amplitudes σI and σf (endurance limit), respectively. Conceptually, a decrease of this ratio suggests an increased tendency for cracking and vice versa. As shown in the text, the model predicts that the crack initiation period varies increasingly with this ratio, and the value of the steady state crack spacing ratio is in and of itself quite sufficient to model the experimental stress-life data in instances where life is controlled by crack initiation period and not the stage II crack propagation. Because of this limitation, extreme care must thus be taken with regard to its application." @default.
- W2000042834 created "2016-06-24" @default.
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- W2000042834 date "1992-04-01" @default.
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- W2000042834 title "A model for high cycle fatigue" @default.
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- W2000042834 doi "https://doi.org/10.1016/0013-7944(92)90239-b" @default.
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