Experimental study of damage accumulation staging in gigacycle fatigue of aviation motors materials

Authors

  • M.V. Bannikov Institute of Continuum Media Mechanics UB RAS
  • I.A. Bannikova Institute of Continuum Media Mechanics UB RAS
  • V.A. Oborin Institute of Continuum Media Mechanics UB RAS

DOI:

https://doi.org/10.7242/2658-705X/2019.4.5

Keywords:

damage accumulation kinetics, scaling, high-and very high cycle fatigue, mathematical modeling, destruction, mesoscopic defects

Abstract

Paper presents the «in situ» method for determining irreversible fatigue damage accumulation based on the analysis of nonlinear manifestations of the feedback signal in a closed system of an ultrasonic fatigue machine. During very high cycle (gigacycle) fatigue, the anomalies appear of the material elastic properties appear, which leads to a nonlinearity effect in the amplitude of oscillations. This effect increases with the initiation and growth of fatigue cracks. The technology was applied to samples of AlMG-6 alloy with preliminary dynamic deformation to determine the moment of initiation and growth of the fatigue crack in very high cycle fatigue regime. This method is applicable for the early detection of fatigue cracks both on the surface, and inside the material under cyclic loading in the ultrasonic mode. On the basis of wide-range defining relations for a deformable solid body with mesoscopic defects, a mathematical model has been proposed that can adequately describe behavior of the material during fatigue failure. The results of mathematical modeling are in good agreement with the experimental data.

Supporting Agencies
Статья подготовлена при финансовой поддержке гранта РФФИ № 16-41-590892 р_а «Экспериментальное исследование стадийности поврежденности при сверхмногоцикловой усталости материалов авиационного моторостроения».

Author Biographies

  • M.V. Bannikov, Institute of Continuum Media Mechanics UB RAS
    кандидат физико-математических наук, научный сотрудник лаборатории Физических основ прочности Института механики сплошных сред УрО РАН (ИМСС УрО РАН)
  • I.A. Bannikova, Institute of Continuum Media Mechanics UB RAS
    кандидат физико-математических наук, сотрудник лаборатории Физических основ прочности, ИМСС УрО РАН
  • V.A. Oborin, Institute of Continuum Media Mechanics UB RAS
    ведущий инженер лаборатории Физических основ прочности, ИМСС УрО РАН

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Published

2019-12-23

Issue

No. 4 (2019)

Section

Research: theory and experiment

How to Cite

Bannikov, M. ., Bannikova, I. ., & Oborin, V. . (2019). Experimental study of damage accumulation staging in gigacycle fatigue of aviation motors materials. Perm Federal Research Centre Journal, 4, 50-58. https://doi.org/10.7242/2658-705X/2019.4.5