한국안전학회지 (Journal of the Korean Society of Safety)
- 제14권2호
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- Pages.19-25
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- 1999
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- 1738-3803(pISSN)
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- 2383-9953(eISSN)
Al 7075 압연재의 피로균열 성장과정에서의 이방성에 관한 연구
A Study on the Anisotropy of Al 7075 Rolling Material in Fatigue Crack Growth Process
초록
The research has extracted two kinds of specimen, one is rolling direction material(R-material) and the other rectangular of rolling direction(V-material), from Al alloy 7075 rolled. We have come to a conclusion by measuring crack propagation behavior with movement type microscope and Replica. 1) R-material shows 130% higher, approx. 39.2MPa in fatigue strength than V-material, approx. 29.4MPa. 2) In crack proportion, contrary to V-material growing directly toward specimen axis, R-material grows neared to shear direction. 3) The life proves that R-material is approx. 122% higher than V-material at 43.1MPa and approx. 135% higher at 47MPa. 4) The correlation between fatigue crack length and fracture life ratio applied to 'log(2a)=A+B (
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