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Downimg matlab1/27/2024 The rainflow algorithm was developed by T. Figure 1: Uniform alternating loading Figure 2: Spectrum loading History The closed loops represent the energy dissipated by the material. At the end of the smaller cycle, the material resumes the stress-strain path of the original cycle, as if the interruption had not occurred. When a material is cyclically strained, a plot of stress against strain shows loops forming from the smaller interruption cycles. The rainflow method is compatible with the cycles obtained from examination of the stress-strain hysteresis cycles. The algorithm was developed by Tatsuo Endo and M. In cases of multiaxial loading, critical plane analysis can be used together with rainflow counting to identify the uniaxial history associated with the plane that maximizes damage. Both methods give an estimate of the fatigue life of a component. This simplification allows the number of cycles until failure of a component to be determined for each rainflow cycle using either Miner's rule to calculate the fatigue damage, or in a crack growth equation to calculate the crack increments. The method successively extracts the smaller interruption cycles from a sequence, which models the material memory effect seen with stress-strain hysteresis cycles. The rainflow-counting algorithm is used in calculating the fatigue life of a component in order to convert a uniaxial loading sequence of varying stress into an equivalent set of constant amplitude stress reversals. Rainflow counting identifies the closed cycles in a stress-strain curve
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