Download PDF by Norman R. Scott: Analog and Digital Computer Technology

By Norman R. Scott

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Fatigue crack initiation followed by Stage II fatigue crack propagation is associated with high stresses, and Stage II fatigue crack propagation from a defect with low stresses. 19, where the underlying distributions are assumed to be log Normal. At stress levels where the scatter bands do not overlap, failure is entirely by the mechanism corresponding to the shorter life. In the vicinity of the crossover point the scatter bands overlap, and a proportion of the specimens will survive, and fail by the mechanism corresponding to longer life.

1. A cycle is the smallest unit of the stress history which repeats exactly. Cycles are often, but not always, sinusoidal. σa (sometimes σ , as in the figure) is the alternating stress, σm is the mean stress, σmax is the maximum stress in the load cycle, and σmin is the minimum stress in the load cycle. Mathematically a load cycle (or stress cycle) is expressed as σm ± σa . Compressive stresses are taken as negative. 2) σm = σmax + σmin . 3) The stress range is S = 2σa = σmax − σmin , and the stress ratio, R = σmin /σmax .

Definitions are sometimes used. For example, loss of a specified amount of stiffness or the appearance of a crack of a specified size. 2). The number of cycles to failure is sometimes called the life or the endurance. It is usually plotted on a logarithmic scale, but the alternating stress may be plotted on either a linear or a logarithmic scale. 6. As used to be conventional (Frost et al. 1974) these S/N curves are for endurances of less than 108 cycles. The region where failure takes place in less than about 104 cycles is called low cycle fatigue, and the region for longer endurances high cycle fatigue.

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Analog and Digital Computer Technology by Norman R. Scott

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