Influence of the complex cross-section of the workpiece and metal hardening on the stress–strain state during bending
DOI:
https://doi.org/10.37142/2076-2151/2025-1(54)40Keywords:
neutral surface, strip, radius of the neutral surface, Deform-3D, complex cross-section, finite element method, stress–strain state.Abstract
Titov V., Sokhan. D., Balushok K. Influence of the complex cross-section of the workpiece and metal hardening on the stress–strain state during bending
The article is devoted to the theoretical analysis of the bending process of a complex-shaped metal strip made of strain-hardening materials. The main objective of the study is to determine the radius of the neutral surface in cross-sections of complex geometry. The assumptions regarding material plasticity, as well as the plane strain state and the volumetric stress state, made it possible to analyze the bending process in the transverse cross-section of the workpiece. Taking these features into account, fundamental equations for determining the neutral surface were proposed. The obtained results make it possible to describe bending processes, which simplifies the analysis and calculation of defect formation during the design of part-manufacturing processes.
The structural scientific and applied problem of ideally plastic bending on an edge in the cold state from aluminum alloys of the Al-Mg system of a flat staff is considered using the example of a typical part of a gas turbine engine, a reverse blade with a transverse aerodynamic cross-section of a workpiece of the “wing” type. The structure of a complex process of forming a blade from a staff with a complex cross-section is proposed. Based on an analytical review of scientific publications and the scientific and technical problem, the need to take into account the influence of metal strengthening and a complex cross-section of the workpiece on the position of the neutral layer is justified to ensure the accuracy of determining the stress-strain state in the deformation center. Based on the obtained hypotheses and assumptions, an equation is obtained that takes into account the step strengthening coefficient, as well as the parameters of the cross-section of the workpiece.
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