Evaluation of Strain Distribution of Perforated Sheet in Circular Cup Deep Drawing

Perforated metal sheets, characterized by a series of punched holes, are utilized across a broad spectrum of industries—from automotive components to household kitchenware—for applications such as ventilation, acoustic insulation, shielding, and weight reduction. Despite their versatility, the plastic forming of thin metal sheets has traditionally been restricted to materials with uniform thickness and properties. Consequently, the forming of perforated materials has seen limited technological advancement. Currently, most products are limited to flat or simply bent geometries, as there are few precedents for machining methods that involve applying high stress to hole edges. During the drawing process, significant tensile and compressive deformations occur at these edges due to discontinuities in deformation resistance. This leads to non-uniform thickness resulting from the interaction between hole-specific deformation and the surrounding sheet's stability. Therefore, clarifying the drawing characteristics of perforated sheets is essential for advancing the field of plastic forming.