A device for testing high strength metallic sheets undergoing cyclic forward and reverse tension–compression loads under plastic strain

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© The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.A device apparatus was designed and built to enable the testing of sheet metal undergoing cyclic forward and reverse tension–compression loads under plastic deformation, while preventing the specimen from buckling. This test allows the identification of parameters for the characterization of the material according to advanced hardening models, that are of utmost interest to the automotive industry, for accurate representation of the physical phenomena occurring during mechanical forming, which enables for tighter manufacturing tolerances. The test specimens were manufactured from steel sheets made of materials BH220 and DP600, with thicknesses of 0.65 mm and 1.00 mm respectively. For each specimen tested, three tension–compression cycles were performed, at a strain rate of 0.5 mm/min. The maximum displacements were 0.6 mm in tension and 0.6 mm in compression. A fork configuration was used in which the device has four main plate blocks to transmit the longitudinal displacement of the machine to the sheet metal and to restrict the plane transverse displacement. The results show that the device is capable of creating the cyclic stress–strain curve of which accurate parameters of Yoshida-Uemori model can be extracted.

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