PSI - Issue 79

Volodymyr Hutsaylyuk et al. / Procedia Structural Integrity 79 (2026) 501–507

506

Fig. 6. Plated layer of aluminum alloy 2024-T3 sample in cross-section: a) combined loading; b) monotonic tension.

Fig. 7. The surface of material failure in a cross-section of an aluminum alloy 2024-T3 sample: a) combined loading; b) monotonic tension.

A methodological difference concerns the timing of impulse: early protocols applied the impulse after the yield point for 2024-T3 aluminum alloy; recent series demonstrate the strongest effect when the impulse is applied near the yield point, confirming a critical timing window for subgrain evolution. Microstructural signatures—lamellar-to-banded transformation, flow channels, subgrain cells, and delamination—match our TEM/SEM observations (Figure 4-7). An energy-based explanation is also provided: transient strain-rate redistribution (temporary braking) and enhanced dissipation create conditions for subgrain rearrangement and defect self-organization. 4. Conclusions This study confirms that the superposition of a short force impulse on monotonic tensile loading of 2024-T3 aluminum alloy transforms deformation and fracture mechanisms. Key outcomes: (1) critical role of impulse timing (near the yield point) in controlling band-structure formation, subgrain evolution, and flow channels; (2) impulse-assisted microstructural transformation without substantial strength loss; (3) transition to mixed-mode fracture (delamination and shear localization); (4) increased ductility via defect self-organization; and (5) practical implications for durability modeling and design in aerospace components. References Chausov M., Voytyuk D., Pylypenko A., Kuzmenko A. Setup for tests of materials with full chart failure , Probl. of Strength, 5(2004) 117–123. Hutsaylyuk V., Torzewski J., Snieżek L., Chausov M., Pypypenko A., Influence Pre-Combined Loading on Fatigue Deformation of Aluminum Alloy 2024-T3, 4th Canadian Conference on Nonlinear Solid Mechanics Montreal, July 23-26, Canada, 2013, p.47. Hutsaylyuk, V., Snieżek, L., Torzewski, J., Chausov, M., Berezin, V., & Pylypenko, A. (2015). Influence of preliminary combined loading on low cyclic fatigue deformation of aluminum alloy D16ChATV. Procedia Engineering, 114, 18–25. https://doi.org/10.1016/j.proeng.2015.08.017 Hutsaylyuk, V., Snieżek, L., Chausov, M., Torzewski, J., Pylypenko, A., & Wachowski, M. (2016). Cyclic deformation of aluminium alloys after the preliminary combined loading. Engineering Failure Analysis, 69, 66-76. https://doi.org/10.1016/j.engfailanal.2016.07.002