Análise comparativa entre dados experimentais/cálculo analítico/simulação do dobramento dos aços LNE 380 e S700MC

Abstract

With the advancement of technology in the metallurgical sector, new high-strength steels are gaining strength in the market, and with them, the challenges related to their manufacture also grow. It is common in industry to use the air bending process as mechanical forming to establish desired geometries to a part. In bending, the springback effect occurs, causing the vast majority of problems related to this process, where the return index is greater as the material resistance increases. This work aimed to analyze the springback effect in two materials (steel LNE 380 and S700MC) by three different methods: experimental, analytical calculation and simulation with finite elements. Material anisotropies as well as mechanical properties were obtained through a traction test and later used in theoretical processes. The experimental method was carried out in a universal testing machine coupled to an 8 mm radius punch and a 40 mm opening die, and after testing, the bent specimens were analyzed by a three-dimensional measuring equipment. For prediction via analytical calculation, five mathematical models were used, three of which were taken from textbooks and the other two from scientific articles. The theoretical method of finite elements was carried out using the Abaqus software, having in its pre-processing a general static analysis with the solid and homogeneous deformable specimen of 0.9 mm in mesh size. Among the theoretical models, it was proved that the analytical forecasting method was not satisfactory, none of the five tested models came close to reality. The finite element software prediction method, on the other hand, obtained excellent springback results for both materials, with the S700MC having the highest springback rates, confirming the presented literature. [resumo fornecido pelo autor]