Electron fractography of fatigue in vacuum

Report (1971)
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Published Date

31-03-1971

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NLR-TR 71032 U

Abstract

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 latter observation leads to the suggestion that crack growth in vacuum is discontinuous, i.e. that the crack does not grow in every cycle.

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