Abstract
An increasing demand exists within the automotive industry to utilize aluminum alloy sheets because of their excellent strength-weight ratio and low emissions, which can improve fuel economy and reduce environmental pollution. High-speed automobile impactions are complicated and highly nonlinear deformation processes. Thus, in this paper, a Gurson-Tvergaard-Needleman (GTN) damage model is used to describe the damage behavior of high-speed electromagnetic impaction to predict the fracture behavior of 5052-O aluminum alloy under high-speed impaction. The parameters of the GTN damage model are obtained based on high-speed electromagnetic forming experiments via scanning electron microscopy. The high-speed electromagnetic impaction behavior process is analyzed according to the obtained GTN model parameters. The shape of the high-speed electromagnetic impaction in the numerical simulations agrees with the experimental results. The analysis of the plastic strain and void volume fraction distributions are analyzed during the process of high-speed impact, which indicates the validity of using the GTN damage model to describe or predict the fracture behavior of high-speed electromagnetic impaction.
Highlights
Low-density materials with good strength properties, such as aluminum alloys, are favored in the automotive, aircraft, and aerospace industries for improving fuel economy and reducing environmental pollution [1]
The reliability of the damage model parameters of the 5052-O aluminum alloy at high strain rate was verified through high-speed electromagnetic impaction with different die shapes
The sheet shapes and profiles of the high-speed electromagnetic impaction in the numerical simulations agreed with the experimental results (Figures 15–17)
Summary
Low-density materials with good strength properties, such as aluminum alloys, are favored in the automotive, aircraft, and aerospace industries for improving fuel economy and reducing environmental pollution [1]. Determining the damage parameters of 5052-O aluminum alloy at a high strain rate is required. We mainly aimed to determine the GTN damage model parameters of 5052-O aluminum alloy at a high strain rate. The reliability of the damage model parameters of the 5052-O aluminum alloy at high strain rate was verified through high-speed electromagnetic impaction with different die shapes. The GTN damage model was used to analyze damage behavior of the 5052-O aluminum alloy sheet during the process of high-speed impaction. The high strain rate damage model predicts the fracture behavior on electromagnetic impaction forming and can be applied to predict the forming limit of high-speed impaction forming. This study lays the foundation for applying the damage mechanics model as a sheet metal failure criterion for high-speed forming of car body aluminum alloy
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