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Broek, D. (author), Hartman, A. (author), Nederveen, A. (author)A few preliminary tests on 2024-T3 material were carried out allowing electron fractographical examination of the fracture features of fatigue crack growth in vacuum. Fatigue striations were generally not formed in vacuum: the fracture surface consists of irregular fine slip steps and coarse slip steps which show a certain periodicity. The...report 1971