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Energy permissive analysis of fatigue fracture in AA5052 sheet: (a) Fatigue crack in lower surface of AA5052 sheet (A, B, C are typical serious friction, oxidation, and corrosion areas); (b) Distribution of chemical element aluminum; (c) Distribution of chemical element magnesium; (d) Distribution of chemical element ferrum; (e) Distribution of chemical element carbon; (f) Distribution of chemical element oxygen.
