The contact half-width B, represents half the arc of contact between the shaft and the bushing. The graph assumes the moduli of both parts is E and defines ΔR as R₂ – R₁. P is the applied load. Hertzian contact diverges from the nonclosed-form solution suggested by Johnson as the contact patch grows. The application suggested by the article’s authors used a bushing with a modulus much lower than that of the shaft.