How Pressure and Friction Affect Metal During Deep Drawing.

What is it about?

Deep drawing is a manufacturing process that transforms flat sheet metal into hollow shapes. This study investigates the plastic instabilities that arise in stamped sheets during this forming operation. The analysis reveals that deformation is non-uniform: the material undergoes biaxial extension and thinning at the base of the punch, localized necking along the vertical walls, and thickening in the area beneath the blank holder. To further understand these phenomena, the material was characterized and a 3D numerical simulation was conducted using finite element method. The objective is to demonstrate how critical deep drawing parameters—specifically blank holder force and the friction coefficient between contact surfaces—influence the material’s plastic strain and overall behavioral response.

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Why is it important?

This study investigates plastic instabilities that arise in stamped sheets during the deep drawing process. Analysis reveals distinct deformation patterns: biaxial extension and thinning at the punch base, localized necking along the vertical walls, and material thickening beneath the blank holder. By combining material characterization with 3D finite element simulations, this work examines how critical parameters—specifically blank holder force and friction coefficients—influence plastic strain and overall material behavior during forming.