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Studies have been conducted to evaluate the low-cycle high-stress fatigue behavior of several ship steels under a variety of loading conditions. On the basis of these tests and related studies reported in the literature a general hypothesis describing the cumulative effect of plastic deformations has been developed. With this hypothesis the deformation obtained in a single loading may be used to describe or predict the basic low-cycle fatigue behavior of mild steels for lives up to approximately 1,000 cycles. Furthermore, limited correlations with existing data from other investigations suggest that it may also be possible to extend the hypothesis to metals other than steel. (Author).
This important, self-contained reference deals with structural life assessment (SLA) and structural health monitoring (SHM) in a combined form. SLA periodically evaluates the state and condition of a structural system and provides recommendations for possible maintenance actions or the end of structural service life. It is a diversified field and relies on the theories of fracture mechanics, fatigue damage process, and reliability theory. For common structures, their life assessment is not only governed by the theory of fracture mechanics and fatigue damage process, but by other factors such as corrosion, grounding, and sudden collision. On the other hand, SHM deals with the detection, prediction, and location of crack development online. Both SLA and SHM are combined in a unified and coherent treatment.