Abstract
An experimental investigation on the fatigue mechanism of metal is reported. In this experimental study, multiple identical test specimens were first preloaded with torsional cyclic loads of increasing number of load cycles, and then tension tests were carried out to obtain their tensile strengths. The obtained test results presented strong experimental evidence for the existence of multistage strength degradation processes in metals under cyclic loading, and the strength degradation was clearly triggered by an abrupt change of cracking behaviour. To improve the theoretical basis of fatigue design by reducing data dispersion in fatigue tests, a modified S-N curve for the region near the fatigue limit was proposed. The grade-D-based section of the curve represents the number of load cycles required for the strength degradation to reach grade D. A strength degradation diagram based on the level of stress and the range of load cycles was also proposed for application.
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Shi, Z., Nakano, M., Liu, C. (2014). Multistage Strength Degradation in S25C Steel Under Torsional Cyclic Loading and Its Engineering Applications. In: Srivatsan, T.S., Imam, M.A., Srinivasan, R. (eds) Fatigue of Materials III. Springer, Cham. https://doi.org/10.1007/978-3-319-48240-8_12
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DOI: https://doi.org/10.1007/978-3-319-48240-8_12
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48597-3
Online ISBN: 978-3-319-48240-8
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