Authors: Daniel J. Cruz, Rui L. Amaral, Sara S. Miranda, Abel D. Santos, Joaquim Mendes

The increasing use of lighter metallic materials, in combination with the complexity of the components to be produced, has associated new challenges for the sheet metal forming industry, such as the need for wider and better material characterization. The forming processes of these materials involve operations where the material is subjected to tensile or compressive stresses, which may be applied in alternating combination. This paper presents the development of an experimental system for the determination of fundamental properties of sheet metal materials during reverse loadings. Buckling of the specimen is an inherent phenomenon in compression, especially for thin materials; therefore, specimen geometry was properly studied and optimized to minimize and avoid this effect. To evaluate the performance of the developed system, experimental results of monotonic tests and tests with reverse loadings are presented, applied to high-strength steels, DP500 and DP780, by studying characteristic phenomena, such as the Bauschinger effect.

Daniel J. Cruz¹ | Rui L. Amaral¹ | Sara S. Miranda¹ | Abel D. Santos² | Joaquim Mendes²
1 Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial (INEGI), Portugal
2 Departamento de Engenharia Mecânica, Faculdade de Engenharia Mecânica da Universidade do Porto (FEUP) Portugal