A simple dry friction model for metal forming process

Analytical and numerical analyses of local loading forming process of T-shape component by using Coulomb, shear and hybrid friction models

“…Based on Von Mises yielding criteria, the upper limit is 0.577 for friction coefficient μ and is 1 for factor friction m [20,38]. Thus, for hybrid friction model, the relationship between friction coefficient and friction factor considering upper limit is expressed as follows [20]:…”

Influence of tool surface on tribological conditions in conventional and dry sheet metal forming

“…10 Investigations for dry friction reveal an increasing friction when the real contact area rises. 11 Furthermore, the interruption of the direct contact (Fig. 12) resulting from the grinding grooves might contribute to an adhesion reduction.…”

Dry sliding frictional characteristics of ZE10 and AZ80 magnesium strips under plastic deformation

“…Bowden and Tabor [16] introduced three basic parameters contributing to the frictional behaviour of unlubricated contacts: (1) real area of contact between the sliding surfaces, (2) bond Several multi-asperity contact and friction models have been developed previously to define the friction coefficient under dry contact condition. Leu [17] studied dry friction mechanism between tool and work-piece in metal forming processes by developing a model relating the real area of contact and strain hardening exponent to the coefficient of friction. Ramezani et al [5,18] developed a static friction model for dry contact for a rubbermetal interface.…”

“…By a set of Brinell hardness tests between a hard ball and a soft flat plane, the following equation was proposed by Leu [17] for dimensionless stress ratio:…”