Abstract
Stainless steels (SUS) and dual-phase (DP) steels have tension-compression asymmetry (TCA) in mechanical responses to full loading cycles. This phenomenon can significantly influence sheet metal forming of such metals, however, it is difficult to describe this behaviour analytically. In this research, a novel analytical method for asymmetric elastic-plastic pure bending using the Cazacu–Barlat 2004 asymmetric yield function is proposed. It only uses material parameters in tension along with an asymmetry coefficient related to the yield function. Bending operations of SUS304 and DP980 are investigated as two case studies. In the pure bending for both SUS304 and DP980, moment–curvature diagrams are analytically obtained. Furthermore, linear and nonlinear springback behaviours of SUS304 are analytically investigated. Moreover, using the analytical model as a user-defined material, a numerical model is developed for both steels under pure bending. In the V-bending case of SUS304 with and without TCA effects, the springback behaviours of the material are investigated numerically. In addition, considering friction effects, the analytical method is further modified for predicting springback behaviours in the V-bending of 16 types of SUS304 with various strengths are determined. All the analytical and numerical results have good agreement with those experimental results from literature for validation.
Highlights
Over the last decade, due to the development of advanced materials and manufacturing technologies, sheet metal forming has become more challenging for industry sectors and researchers.This manufacturing process has a wide range of applications in automobile parts, electronic parts, food and drink cans, etc
Considering friction effects, the analytical method is further modified for predicting springback behaviours in the V-bending of 16 types of SUS304 with various strengths are determined
The results show that springback prediction improved significantly by considering the tension–compression asymmetry (TCA) of the material
Summary
Due to the development of advanced materials and manufacturing technologies, sheet metal forming has become more challenging for industry sectors and researchers. A novel analytical method is proposed for steels, which is based on uniaxial, elastic-plastic bending by applying the Cazacu–Barlat 2004 asymmetric yield function and considering the neutral surface shift. This method uses only the material parameters in tension, along with an asymmetry coefficient related to the yield function. It can greatly simplify the analytic and numerical studies of metal sheet forming.
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