Abstract
A boundary friction model which includes both plowing and adhesion stress has been developed to simulate the stretching of sheet over a cylindrical pin boundary regime. The equilibrium equation defining the local frictional shear stress on the workpiece has been combined with the existing friction model to determine fractional contact area and friction in the contact region. Numerical methods have been used to solve the governing equation with the measured initial condition obtained from the experiments. The punch friction test which simulates the stretching of sheet over a punch corner radius in a typical draw die is used to compare the theoretical friciton modeling. The measured friciton coefficients increase with lower stretching speed and decreases if lubricant is appled at the interface between workpiece and cylindrical pin. The theoretical prediction shows the same trend of increasing friction coefficient with increase in strain in the contact region.
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