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Fatigue crack growth studies on constant compliance specimen

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Summary

Fatigue crack growth tests in the presence of tensile cyclic stressing have been conducted on 18% Nickel Maraging steel and 70/30 Brass. The stress intensity level is restricted to values which maintain plane strain conditions at the crack tip. Crack growth has a linear relationship to maximum stress intensity and the results predicted a minimum stress intensity below which crack growth should not occur.

Zusammenfassung

Versuche wurden unternommen an einem martensitaushärtbarem Stahl mit einem Nickelgehalt von 18% und einem 70/30-Messing über die Fortpflanzung von Dauerbruchanrissen bei zyklischer Zugbeanspruchung.

Das Spannungsintensitätsniveau ist beschränkt auf Werte, bei denen ebene Dehnungsbedingungen am Rißende bestehen. Die Rißfortpflanzung hängt linear von der Maximalspannungsintensität ab. Die Ergebnisse führen auf ein Minimum der Spannungsintensität, unterhalb dessen Risse sich nicht fortpflanzen.

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Abbreviations

a :

crack length, ins.

a 0 :

initial crack length

c :

constant

e :

distance from wedge tip to line of load application, ins.

H p :

depth of tapered split arm at load line ins.

K I :

stress intensity p.s.i. √ins

K Ifmax :

maximum fatigue stress intensity p.s.i. √ins

K Ifmin :

minimum fatigue stress intensity p.s.i. √ins

N :

number of cycles

P :

load. lb.

R :

stress intensity ratio <1

σ :

stress p.s.i.

References

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  3. Srawley, J. E. andB. Gross, Mat. Res. & Stand.7, 155–162 (1967).

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  4. Adams, N. J. I. andH. G. Munro, J. of Strain5, 1 (1969).

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  5. Christensen, R. H. andM. B. Harmon, A.S.T.M. STP 415 (Philadelphia 1967).

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Author notes

  1. N. J. I. Adams

    Present address: Langley Research Center, N.A.S.A. Fatigue Branch, Hampton, Virginia, USA

Authors and Affiliations

  1. Royal Military College of Science, Shrivenham, UK

    N. J. I. Adams

Authors
  1. N. J. I. Adams
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Adams, N.J.I. Fatigue crack growth studies on constant compliance specimen. Rheol Acta 9, 111–114 (1970). https://doi.org/10.1007/BF01984601

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  • DOI: https://doi.org/10.1007/BF01984601

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