Abstract
Advanced high-strength steels (AHSSs) exhibit large, and sometimes anisotropic, springback recovery after forming. Accurate description of the anisotropic elasto-plastic behaviour of sheet metals is critical for predicting their anisotropic springback behaviour. For some materials, the initial anisotropy is maintained while hardening progresses. However, for other materials, anisotropy changes with hardening. In this work, to account for the evolution of anisotropy of a dual-phase steel, an elastoplastic material constitutive model is developed. In particular, the combined isotropic–kinematic hardening model was modified. Tensile loading–unloading, uniaxial and biaxial tension, and tension–compression tests were conducted along the rolling, diagonal, and transverse directions to measure the anisotropic properties, and the parameters of the proposed constitutive model were determined. For validation, the proposed model was applied to a U-bending process, and the measured springback angles were compared to the predicted ones.
Highlights
Weight reduction, in order to improve fuel efficiency and meet CO2 regulations for addressing global warming while maintaining safety regulations, is an important issue in automotive manufacturing [1,2]
We investigate the application of advanced high-strength steels (AHSSs), with good strength and formability, in automotive parts
The demand for automotive parts made of AHSSs is based on their excellent impact resistance, which is an asset for the reinforcement of the car body structure, and which depends on their high strength [3,4,5,6,7]
Summary
In order to improve fuel efficiency and meet CO2 regulations for addressing global warming while maintaining safety regulations, is an important issue in automotive manufacturing [1,2]. The chord modulus model [18] represents a changing elastic modulus behaviour according to the hardening progress by reducing the elastic modulus with the increase in equivalent plastic strain. This model can improve the accuracy in springback prediction, because it is effective in expressing the reduction phenomenon and is computationally efficient. Model [27] was proposed, wherein the plastic behaviour of a metallic material subjected to multiple or continuous strain path changes is described using a collapse of the yield function. The proposed model was applied to a U-bending process, and the measured and predicted springback angles were compared
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