Comparação entre modelos matemáticos/simulações e a prática no dobramento de peças de aço LNE 280 e alumínio 1100 H14

Abstract

Mechanical forming process have evolved over time and have become an essential process for obtaining simple components such as a "V" bend to complex ones such as the side structure of a car. However, due to the phenomenon of springback, whose behavior is non-linear, it is essential that it be evaluated in the development of components and tools. Thus, the focus of this work is to generate a comparison between the methods to predict the springback, in order to help the designer, whether in the design of the component or the forming tool. To generate this comparison, numerical analysis was used in Abaqus software, analytical analysis with the methods of Leu (2018) and Gardiner (1957) and experimental analysis with two different materials, LNE 280 steel and 1100 H14 aluminum. Good agreement was obtained with previous studies regarding mean anisotropy (rm=0,94; rm=0,53) and planar anisotropy (Delta r=-0,03; Delta r=0,46) for LNE 280 steel and 1100 H14 aluminum respectively. However, for aluminum, the hardening index was well below the reported by other studies, which may indicate variations between the material analyzed and that evaluated in the literature. As for the comparisons between the different methods in relation to the springback, although the results are different for each method, within the uncertainties, for a "V" bend it is valid to use any of the presented methods. [resumo fornecido pelo autor]