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<p>The paper investigates the process of fatigue damage accumulation in clad D16 aluminum alloy under regular and irregular cyclic loading. A universal methodological approach is proposed for the quantitative evaluation of damage degree, based on the analysis of the evolution of the deformation relief on the specimen surface. Based on the digital processing of high‑resolution surface images, a damage parameter <i>D</i> was determined, characterizing the number of binarized bright elements resulting from microplastic strains. It is shown that the parameter <i>D</i> increases monotonically throughout the loading period until macrocrack initiation and exhibits a clearly nonlinear behavior; for instance, a deceleration in its change is observed at the final stages of cyclic loading. A comparative analysis of regular and irregular loading was carried out, and it was found that the number of cycles to failure practically does not depend on the sequence order of amplitudes in the random loading spectrum. A significant dependence of damage parameters on the magnitude of the applied maximum load amplitude was determined. The results confirm the feasibility of using digital surface analysis methods to assess material condition under cyclic loading and predict residual life.</p>

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Fatigue Damage of D16 Aluminum Alloy Under Regular and Irregular Loading

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • A. V. Byalonovych,
  • G. G. Pysarenko,
  • L. E. Matokhnyuk

摘要

The paper investigates the process of fatigue damage accumulation in clad D16 aluminum alloy under regular and irregular cyclic loading. A universal methodological approach is proposed for the quantitative evaluation of damage degree, based on the analysis of the evolution of the deformation relief on the specimen surface. Based on the digital processing of high‑resolution surface images, a damage parameter D was determined, characterizing the number of binarized bright elements resulting from microplastic strains. It is shown that the parameter D increases monotonically throughout the loading period until macrocrack initiation and exhibits a clearly nonlinear behavior; for instance, a deceleration in its change is observed at the final stages of cyclic loading. A comparative analysis of regular and irregular loading was carried out, and it was found that the number of cycles to failure practically does not depend on the sequence order of amplitudes in the random loading spectrum. A significant dependence of damage parameters on the magnitude of the applied maximum load amplitude was determined. The results confirm the feasibility of using digital surface analysis methods to assess material condition under cyclic loading and predict residual life.