Retention characteristics of rushes
Deep-drawing tribology

Based on the work of Stoughton [19] and Marciniak and Duncan [20], we can simply estimate the tensile and holding forces f and h (per unit sheet width, initial thickness t₀), the evolution of the apparent friction coefficient µ_a with system geometry and sheet thinning Δt/t₀ [21]. These formulas therefore provide interesting elements for the design of the operation. Let's clarify this point beforehand to complement the considerations in paragraph 3.3 of [BM7535].

We consider a stamping operation where the blank holder is fitted with a snap ring of total length...