Anomalies in the elastic properties of metals at very high cycle loading and kinetics of damage accumulation

Authors

  • Михаил Владимирович Банников (Mikhail V. Bannikov) Perm State University; Institute of continuous media mechanics UB RAS
  • Ирина Анатольевна Банникова (Irina A. Bannikova) Institute of continuous media mechanics UB RAS
  • Сергей Витальевич Уваров (Sergey V. Uvarov) Institute of continuous media mechanics UB RAS
  • Олег Борисович Наймарк (Oleg B. Naimark) Institute of continuous media mechanics UB RAS

DOI:

https://doi.org/10.17072/1994-3598-2017-4-63-70

Abstract

Paper describes current understanding of the mechanism of origin ofcyclic irreversible shifts as structurally induced plastic shear strains, which are generally part of the accumulated plastic strain, which lead to formation of fatigue cracks. Statistical approach proposedwhich allowed to determine types of collective modes in ensembles mesoscopic defects and establish their role in the mechanisms of low- and high-cycle fatigue fracture, fracture mechanisms of scaling. The system of defining equations for low- and high-cycle fatigueis shown. Connection between the microscopic mechanisms of fatigue with model representation and description of stages of damage is describedon the basis of non-linear kinetics ofdefects accumulation during cyclic loading. The technique for «in situ» definition of fatigue damage accumulation by analyzing nonlinearity of the feedback signal of ultrasonic fatigue settingwas presented. In very high cycle fatigue regime anomalies of elastic properties of the material are manifestingwhich leads to effect of non-linearity inoscillation amplitude. This effect increases with the initiation and growth of fatigue cracks. This method was applied toaluminum alloy samples at different levels of the stressto determine the moment of initiationand growth of fatigue cracks.This technique is useful for early detection of fatigue cracks, both on the surface and within the material.

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Published

2017-12-28

How to Cite

Банников (Mikhail V. Bannikov) М. В., Банникова (Irina A. Bannikova) И. А., Уваров (Sergey V. Uvarov) С. В., & Наймарк (Oleg B. Naimark) О. Б. (2017). Anomalies in the elastic properties of metals at very high cycle loading and kinetics of damage accumulation. Bulletin of Perm University. Physics, (4(38). https://doi.org/10.17072/1994-3598-2017-4-63-70

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