Strength of Materials

, Volume 22, Issue 1, pp 52–59 | Cite as

Effect of substructure on crack formation and total failure of industrial alloys of the aluminium-copper-magnesium system under low-cycle fatigue conditions

  • V. V. Teleshov
  • V. I. Kuzginov
  • O. M. Sirotkina
  • L. A. Gorskaya
  • L. A. Nosik
Scientific and Technical Section
  • 33 Downloads

Abstract

On the example of pressed semifinished products made of D16 and AK4-1 type alloys of different chemical composition in the Al-Cu-Mg system in the T and T1 conditions a study has been made of the effect of a number of structural elements on the fatigue life of plane specimens with a concentrator (stress concentration factor 2.6) under low-cycle fatigue conditions. The duration of the stage to development of a fatigue crack N0 with an area of about O.05 mm2 and the overall life of specimens to total failure Nf have been determined. Tests have been carried out for low-cycle fatigue under repeated tension conditions with a cycle asymmetry factor R = O.01, frequency 5 Hz, and maximum stress in the cycle of 160 MPa. It has been established that a reduction in iron and silicon content in alloys D16, D16ch, and 1163 decreases the content in the structure of coarse particles of AlFeMnCuSi phase of variable composition and it increases the life of specimens in the naturally aged condition as a result of increasing the N0 stage. A reduction in copper content in alloy 1163T from 4.3 to 3.9% and introduction of zirconium in an amount of ∼0.10%, which weakly affects N0, increases the duration of the period of crack growth Nf-No by 50 kcycles. All of the alloys of the D16ch and 1163 type in the artificially aged condition have similar values of parameters N0 and Nf with a much lower level of them in the T condition, which is explained by a change in the mechanism for crack development and its growth rate.

Keywords

Fatigue Fatigue Crack Fatigue Life Aged Condition Stress Concentration Factor 

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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • V. V. Teleshov
    • 1
  • V. I. Kuzginov
    • 1
  • O. M. Sirotkina
    • 1
  • L. A. Gorskaya
    • 1
  • L. A. Nosik
    • 1
  1. 1.Moscow

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