IMPROVEMENT OF THE BENDING PARAMETERS OF BIMETALLIC ARCS OF PASSENGER CARS

Purpose.Layered metals are extensively applied across numerous industrial sectors due to their ability to combine unique physical and mechanical properties that are unattainable in single-metal solutions, while also enabling savings in both ferrous and non-ferrous materials.Although the application of costly alloys within layered metal structures is welldocumented and justified, the technological considerations and practical implementation methods of such compositions remain insufficiently explored.Methodology.Previous studies have examined how the layering principle can address various technological challenges in sheet metal forming.However, the literature lacks comprehensive coverage of how bimetallic materials can effectively replace expensive alloys in metalworking processes.Many theoretical and practical aspects of this application remain underdeveloped or unaddressed.Findings.The viability of employing profile blanks made from dissimilar metals for manufacturing structural automotive components-such as passenger vehicle arches-via bending and tensioning processes has been confirmed.The required pre-stretching force is calculated as the product of the current cross-sectional area and the yield strength at the intersection point of the hardening curves for both materials.Bending resistance is modeled as if the composite blank were a homogeneous material with a unified yield strength, and the calibration stretch is limited by the ductility of the less expensive metal component.Originality.Bending under tension for composite (binary) blanks presents significant deviations from the deformation behavior of uniform materials.These differences arise from the anisotropic and discontinuous nature of the material properties.This necessitates a revised analytical model for joint plastic deformation in heterogeneous metal systems.Special attention is given to the behavior of dissimilar-metal blanks during pre-stretching and subsequent forming.Practical Value.The calculation sequence for determining optimal bending parameters in composite materials includes:1. Superimposing the hardening curves of both metals and identifying their intersection point.2. Calculating the pre-stretching force using stress-strain relationships.3. Determining the nominal external bending moment and associated deformation values.4. Defining calibration stretch parameters and ultimate strain limits.