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RISS 인기검색어
- 검색키워드
- 저자 : Yuejie Cui (검색결과 2 건)
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Damage and failure characterization of 7075 aluminum alloy hot stamping
Zhiqiang Zhang,Yuejie Cui,Qing-Min Chen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
7000 series high strength aluminum alloys are increasingly used in manufacturing automobile body parts to meet the more stringent demands for automobile lightweight. Hot stamping of 7000 series high strength aluminum alloys is a complex thermal-mechanical coupling process and precise simulation is needed to predict material fracture. To obtain damage model of 7075 aluminum alloy in hot stamping, five different stress triaxiality specimens were designed. The fracture strain, critical strain and average stress triaxiality of different specimens were obtained by the hybrid finite element simulation and experiment (FE-EXP) method. GISSMO model of 7075 aluminum alloy at 400 °C was established. Compared with the experimental results of U-shaped part hot stamping under different lubrication conditions, the calibrated GISSMO model was demonstrated to predict the damage behavior of 7075 aluminum alloy during high temperature deformation accurately.
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Damaged and failure characterization of 7075-T6 Al alloy based on GISSMO model
Zhiqiang Zhang,Yuejie Cui,Ge Yu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
Failure simulation of 7075-T6 Al alloy is very important due to its relatively low ductility compared to conventional steel. A hybrid numerical-experimental method was developed to determine plastic strains at fracture as a function of triaxiality. The uniaxial tension tests were performed by using the specimens including pure shear, 45° shear, smooth, R5 notch and R15 notch. The fracture locus was established by calibrating the parameters of the Hosford-Coulomb fracture model and was implemented into the GISSMO damage model. The results showed that the predicted force-displacement data were in good agreement with the experimental results. The results of the mesh dependence showed that the mesh size in the range of 0.5-5 mm did not have much influence on the damage results. To assess the accuracy of the damage model, three-point bending tests of the anti-collision beam were performed. The calibrated GISSMO damage model could accurately predict the load-displacement data.
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