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- W4293353753 abstract "The local strain method for estimating fatigue life employs the stresses and strains that occur at critical, high-strain regions, such as geometric notches, where fatigue cracks are likely to start. Materials properties are defined that give cyclic stress-strain curves and strain-life curves. These curves need modification for biaxial or triaxial stress, and strain-life curves can be adjusted to include surface finish and size effects. The effect of mean stress can be included in strain-life curves by the methods of Morrow, or Smith, Watson and Topper, or Walker. To make estimates of fatigue life for notched members, the local stresses and strains that occur at the notch during cyclic loading need to be calculated or estimated, with Neuber’s rule being a suitable estimation method. When used with the cyclic stress-strain curve, this rule may be applied to cyclic loading, and even to irregular variation of load with time. For irregular loading, the plasticity memory effect is employed to identify closed stress-strain hysteresis loops, which correspond to cycles counted by the rainflow method, enabling life estimates based on the Palmgren-Miner rule. Some additional considerations are discussed: mean stress relaxation, overload effects, sequence effects, fatigue limit effects, crack growth effects, and the use of a component-specific strain-life curve." @default.
- W4293353753 created "2022-08-27" @default.
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- W4293353753 date "2023-01-01" @default.
- W4293353753 modified "2023-09-27" @default.
- W4293353753 title "Local Strain Approach to Fatigue" @default.
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- W4293353753 doi "https://doi.org/10.1016/b978-0-12-822944-6.00054-2" @default.
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