Advertisement

Strength of Materials

, Volume 11, Issue 6, pp 558–563 | Cite as

Relationship of fracture relief formed in growth of a fatigue crack in aluminum alloys to the mechanism of failure

  • V. S. Ivanova
  • A. A. Shanyavskii
Scientific-Technical Section
  • 28 Downloads

Conclusions

  1. 1.

    Fatigue failure of aluminum alloys is characterized by three zones of the fracture, PS, S, and P or P + S, corresponding to the three different mechanisms of crack growth. A change in the mechanism of crack growth is related to reaching the threshold values of the range of stress-intensity coefficient ΔK I N−1 and ΔK I N . The maximum range of change in the range of the stress-intensity coefficient in which the rule of formation of a single stiration during a single load cycle is observed and the failure process is controlled by the value of ΔKI is determined by the failure constant Δ of the material, which is equal to 0.22 for aluminum alloys [3],

     
  2. 2.

    This feature of the formation of stirated fracture relief must be taken into consideration in measuring the spacing of stirations to determine the period of steady growth of a crack. All of the measurements must be made in the center of the sample or part away from the focus of the fracture in the direction of propagation of the crack to the maximum depth. A crack will always propagate in this direction under conditions of plane deformation, and the results of measuring the spacing of stirations in objects of different geometry and different materials will correspond to the condition of similarity of crack growth based on the stressed state.

     

Keywords

Aluminum Fatigue Stressed State Aluminum Alloy Fatigue Crack 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    V. S. Ivanova, The Fatigue Failure of Metals [in Russian], Metallurgiya, Moscow (1963).Google Scholar
  2. 2.
    P. C. Paris, “The fracture mechanics approach to fatigue,” in: Fatigue, an Interdisciplinary Approach, Syracuse Univ. Press (1964), pp. 20–26.Google Scholar
  3. 3.
    V. S. Ivanova and V. F. Terent'ev, The Nature of the Fatigue of Metals [in Russian], Metallurgiya, Moscow (1975).Google Scholar
  4. 4.
    Koterazava, Mori, Mattsui, and Simo, “Fractographic investigations of fatigue crack growth,” Teor. Osn. Inzh. Raschetov,4, 7–12 (1973).Google Scholar
  5. 5.
    S. Kotsan'da, The Fatigue Failure of Metals [in Russian], Metallurgiya, Moscow (1976).Google Scholar
  6. 6.
    “The effect of intermetallic particles on fatigue crack propagation in aluminum alloys,” Proceedings of the Second International Conference on Fracture, Brighton, Apr. 13–18, 1969, pp. 754–764.Google Scholar
  7. 7.
    I. P. Zhegina, “Fractographic features of aluminum alloys in connection with their capacity to retard failure,” Author's Abstract of Candidate's Dissertation, Technical Sciences, Moscow (1975).Google Scholar
  8. 8.
    T. Yokobori and K. Sato, “The effect of frequency on fatigue crack propagation rate and stiration spacing in 2024-T3 aluminum alloy and SM-50 steel,” Eng. Fract. Mech.,8, 81–88 (1976).Google Scholar
  9. 9.
    P. E. Patis and G. C. Shih, “Stress analyses of cracks,” in: Fracture Toughness Testing and Its Applications, ASTM, STR, 381 (1965), pp. 30–81.Google Scholar
  10. 10.
    A. Otsuka, K. Mori, and T. Miyata, “The condition of fatigue crack growth in mixed mode condition,” Eng. Fract. Mech.,7, 429–439 (1975).Google Scholar
  11. 11.
    G. P. Cherepanov, The Mechanics of Brittle Failure [in Russian], Nauka, Moscow (1974).Google Scholar
  12. 12.
    G. S. Pisarenko, A. J. Krasowsky, V. A. Stepanenko, and V. V. Pokrovski, The 1974 Symposium on Mechanical Behavior of Materials, Full Manuscripts, Session A-G, August 21–22, MBM Symposium Committee, Soc. Mater. Sci., Japan (1974).Google Scholar
  13. 13.
    A. A. Shanyavskii and V. S. Botov, “The rules of fatigue crack development in D1T alloy,” Nauka Tekh. Grazhd. Aviatsii, No. 2/98, 10–14 (1975).Google Scholar

Copyright information

© Plenum Publishing Corporation 1980

Authors and Affiliations

  • V. S. Ivanova
    • 1
  • A. A. Shanyavskii
    • 1
  1. 1.A. A. Baikov Institute of MetallurgyAcademy of Sciences of the USSRMoscow

Personalised recommendations