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Hypothesis of Spectral Addition and Its Application to Determination of Endurance under Random Loads,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Random loads are one of the most wide-spread types of loads which affect the construction of machines, mechanisms and buildings. Generally accepted methods of computing the endurance are based on the hypothesis of linear accumulation of fatigue damage, the correctness of which is in doubt for many cases of loading. Especially considerable difficulties show up in cases of random loads, since the concept of a cycle of variable loading in this case is by far not unambiguous. Depending upon the means of cycle-formation the computed values of endurance for certain types of loads will differ by factors of ten. The report proposes an approach to the determination of endurance under random loads, avoiding the cited difficulties. The theory was developed in application to the standard normal loading process.
APPROVED FOR PUBLIC RELEASE