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학술대회자료
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한국로고스경영학회 한국로고스경영학회 학술발표대회논문집 PROCEEDINGS of the 5th International Joint Conference part 2
발행연도
2007.7
수록면
74 - 81 (8page)

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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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Abstract
1. Introduction
2. Specimens and Test Method
3. Fractographic Analysis Method
4. Test Result
5. Conclusion

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