Статті КОМТ (ДМетІ)

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Determination of the Deformation Parameters of the Steel Reinforcing Phase inside the Aluminum Matrix during Hot Rolling
(Dnipro University of Technology, Dnipro, Ukraine, 2022) Nosko, Maxim I.; Konovodov, Dmytro V.; Samsonenko, Andrii A.; Bobukh, Oleksandr S.
ENG: Purpose. Comparison of deformation parameters during rolling of reinforced composites based on aluminum alloy using braided and expanded steel meshes as a reinforcing phase. Methodology. An experimental study on the effect of pressure on the deformation of the reinforcing phase during rolling of aluminum composites is carried out. A wire mesh and expanded mesh made of stainless steel was used as a reinforcing phase. The effect of deformation on the change in the lattice angle of the reinforcing phase is investigated. Findings. In this work, experimental data on the parameters of deformation of the wire mesh and expanded mesh are obtained. A comparison is made of the shape change in such grids under hot rolling conditions between two aluminum plates, which play the role of a matrix. It is found that the elongation coefficients of the lattice for the experiment with a wire mesh μc is equal to 1.68–2.3, which is greater than the coefficient of elongation of the lattice in the expanded mesh of 1.55–2.2. Therefore, expanded sheets make the best reinforcing layer for aluminumbased composites produced by the rollbonding process. Expanded mesh also reduces the risk of rupture at the intersection of wires. Originality. In the work, for the first time, a comparison of the deformation parameters during roll bonding of composites based on an aluminum alloy, reinforced with a braided and expanded steel mesh, has been given. Obtaining composite materials by means of hot roll bonding requires an understanding of the flow of composite components during deformation and their influence on each other. These peculiarities have not been studied sufficiently. Currently, there is no reliable method for predicting the behavior of the material of a solid reinforcing phase of various shapes inside a composite. Practical value. Advantages of using an expanded steel mesh for reinforcing aluminumbased composites have been confirmed. Scientific results can be used to refine calculating methods for metal flow at high hydrostatic pressure with variable components of the stress tensor and the major stresses.
Influence of Deformation Parameters on Mechanical Behaviour of Aluminium-Magnesium Roll-Bonded Composites with Kirigami-Structured Inlays
(Dnipro University of Technology, Dnipro, 2025) Frolov, Yaroslav V.; Nuernberger, Florian; Konovodov, Dmytro V.; Bobukh, Oleksandr S.; Boiarkin, Viacheslav V.
ENG: Purpose. To assess how the mechanical properties of a composite material comprising EN AW 1050 aluminium, and kirigami-inspired structure made from E235 steel and AZ31 magnesium alloy, depend on the initial configuration of its components and the degree of reduction during roll bonding. Methodology. The study involved roll-bonding five-layer composite sheets with the following configuration: two of the internal layers consisted of a kirigami structure implemented using an expanded metal mesh made from low-carbon steel. The outer matrix layers were aluminium alloy sheets, and the core matrix layer was formed from magnesium alloy sheets. The transformation of the kirigami structure within the composite was assessed using X-ray analysis. The mechanical properties of the composites were evaluated using three methods: impact bending tests, three-point bending tests and ball indentation tests. Findings. Experimental investigations yielded data on how the kirigami structure transforms within the five-layer composite, depending on the rolling reduction. It was found that a rolling reduction of 55 % provided an isotropic mechanical response. Mechanical testing showed that the energy absorption capacity was enhanced by 60–70 % with kirigami inlay, even under complex stress–strain conditions. The stiffness of the reinforced composite was found to be several times higher than that of unreinforced aluminium. Originality. This study is the pioneer in analysing the combined effect of component configuration and rolling reduction on the mechanical behaviour of a five-layer aluminium-magnesium composite reinforced with a steel kirigami structure. The study demonstrated that deformation parameters ensured reliable bonding between the aluminium and magnesium layers and significantly enhanced mechanical performance by controlling the transformation of the kirigami structure. Practical value. The findings of this study enhance our understanding of how rolling reduction and initial layer configuration affect the deformation behaviour of multilayer Al-Mg composites. They also lay the groundwork for designing novel composites reinforced with kirigami structures for advanced structural applications.
Transformation of the Kirigami-Type Deformable Inlay during Roll Bonding
(Dnipro University of Technology, Dnipro, 2025) Frolov, Yaroslav V.; Konovodov, Dmytro V.; Bobukh, Oleksandr S.; Boiarkin, Viacheslav V.
ENG: Purpose. To quantitatively analyze the deformation of kirigami-type deformable inlays during the roll bonding process using soft outer matrices, with the goal of predicting their behavior within the composite structure. Methodology. The research involved the fabrication of three-layer composite sheets through roll bonding. Expanded meshes made of mild steel and stainless steel served as the inlay phase, while copper and aluminum alloy sheets were employed as matrix materials. The transformation of the inlay phase within the composite sheets was evaluated. Findings. The experimental investigation yielded data on the deformation behavior of kirigami-type inlays embedded within three-layer sheets during roll bonding. It was observed that using an aluminum matrix induces greater axial metal flow in the deformation zone, leading to a significant increase in the mesh distortion angle. A copper matrix primarily causes flattening of the mesh cells with minimal changes to their angular deformation. In contrast, rolling the steel mesh without a matrix results in negligible angular distortion until the rolling reduction exceeds 50 %. Originality. This study represents the first quantitative analysis of the geometric transformation of kirigami-type deformable inlays as a function of deformation magnitude and matrix material properties during roll bonding. Understanding the shape transformation of the reinforcing phase within the composite sheet enables more accurate prediction of the contact area between the matrix materials during the bonding process. Practical value. The findings of this research provide a basis for predicting the final geometry of kirigami structures within composite materials.