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On the formation of fatigue striations

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International Journal of Fracture Mechanics Aims and scope Submit manuscript

Abstract

Thin foils of an aluminium alloy containing the fracture surface were studied in the electron microscope. The fatigue striations were visible due to thickness contrast and bands of dislocations. Supplementary etch pit studies and stereographic measurements were carried out.

In many cases the crack plane was close to (100) or (110). The mechanism of fatigue crack propagation is discussed in the light of the new evidence.

Résumé

La surface de rupture d'un alliage d'aluminium a été étudiée par pellicules minces en utilisant la microscopie électronique par transmission. On a observé les stries de fatigue, qui ont également fait l'objet de mesures fractographiques. On remarque que le plan de la fissure est souvent proche de (110) ou de (100). On discute le mécanisme de la propagation des fissures de fatigue sur la base de ces résultats.

Zusammenfassung

Dünne Folien aus einer Aluminiumlegierung welche die Bruchflächen enthielten, wurden mit Hilfe der Durchstrählungselektronenmikroskopie untersucht. Dank des Dickenunterschiedes und der Versetzungslinien waren die Ermüdungslinien sichtbar. Zusätzliche Ätzgruben- und stereographische Prüfungen wurden durchgeführt.

In vielen Fällen war die Bruchfläche annähernd entlang den Richtungen (110) oder (100). Der Mechanismus der Fortpflanzung eines Ermüdungsbruchs wird im Lichte dieser neuen Erkenntnisse erörtert.

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Author notes

  1. C. Q. Bowles

    Present address: University of Missouri, Kansas City, Mo.

Authors and Affiliations

  1. Midwest Research Institute, Kansas City, Mo.

    C. Q. Bowles

  2. National Aerospace Laboratory NLR, Amsterdam, The Netherlands

    D. Broek

Authors
  1. C. Q. Bowles
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  2. D. Broek
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Additional information

The work has been carried out at the National Aerospace Laboratory NLR, Amsterdam.

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Bowles, C.Q., Broek, D. On the formation of fatigue striations. Int J Fract 8, 75–85 (1972). https://doi.org/10.1007/BF00185199

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  • DOI: https://doi.org/10.1007/BF00185199

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