Abstract
In order to improve sheared edge quality of aluminum sheets, shearing tests were conducted under various axial stresses at the shearing region, and the effect of the axial stress was investigated. Numerical simulations of the shearing process were carried out using a rigid plastic finite element simulation code developed by the authors. In the simulation, the Jeong expression was used as a fracture criterion of aluminum sheet. The distributions of fracture value and mean normal stress at the shearing region of the sheet were calculated. The experimental and simulation results showed that the rollover depth and fracture surface length decrease, but the burnish surface length increases with increasing additional axial compressive stress. When the axial compressive stress was applied, the mean normal stress becomes lower at the shearing region. Therefore, the fracture value was decreased, and the crack initiation was delayed. The experimental results were in good agreement with the simulation results.
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