Forming limit prediction and numerical simulation of 5052 aluminum alloy
Based on the Nakazima hemispherical punch bulging experiment,the simplified model was established by finite element soft-ware.The effects of lubrication condition,stamping speed and die fillet radius on the forming limits of 5052 aluminum alloy were ana-lyzed.The results show that the forming limit curve(FLC)shifts downward with the increase of friction factor,which indicates that suit-able lubrication condition is favorable for the forming of sheet under complex processes.The FLC shows decreasing trend by increasing the stamping speed.It illustrates that reducing stamping speed can improve the material ductility without considering the actual production ef-ficiency.While increasing the die fillet radius causes the FLC to shift upward and increase the forming limit of the sheet.The high coinci-dence between the simulation result and experiment result verified the reliability of the finite element prediction.
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