4. Retention characteristics of rushes

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 t ₀ ), the evolution of the apparent friction coefficient µ _a with system geometry and sheet thinning Δt/t ₀ [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] ....