Abstract
Striation is a typical pattern observed on the fatigue fracture surface and the striation spacing is known to correspond to a macroscopic fatigue crack growth rate. Many models for the prediction for the formation of such striation have been proposed. However, these theories and methods can not be applied under random loading spectrum. In this study, the fatigue tests were carried out on aluminum alloy under random loading spectrum. The fatigue fracture surfaces were observed in the scanning electron microscope (SEM) and great quantities of SEM micrographs were synthesized and saved in computer system. The space and morphology of several large-scale striations, which are expected to form at the relatively greater load range in loading block, were observed. The crack length for each loading block was decided in consideration of regularity and repetition of those striations. It showed that the applicability of fractographic methods on the fatigue fracture surface under random loading spectrum.
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