Coefficient Of Kinetic Friction Of Sheet Metal

Assuming purely plastic real contacts newton s law of viscosity and a square root behavior of the hydrodynamic coefficient of friction with respect to the hydrodynamic hersey parameter an analytic model is found.

Coefficient of kinetic friction of sheet metal.

The force of kinetic friction is μk times the normal force on a body. Design resources friction design data. It is expressed in newtons n. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion.

The coefficient of kinetic friction is denoted by the greek letter mu μ with a subscript k. The frictional force for static friction can be expressed as. This paper presents the derivation of a first order friction model for lubricated sheet metal forming. The value of μsis generally higher than the value of μkfor a given combination of materials.

Where f k is the force of kinetic friction μ k is the coefficient of sliding friction or kinetic friction and f n is the normal force equal to the object s weight if the problem involves a horizontal surface and no other vertical forces are acting i e f n mg where m is the object s mass and g is the acceleration due to gravity. Hence the real contact area must be recalculated for the accurate description of friction behavior. Where μsis the coefficient of static friction and μkis the coefficient of kinetic friction. Since friction is a force the unit of the frictional force is the newton n.

Typically steel on steel dry static friction coefficient 0 8 drops to 0 4 when sliding is initiated and steel on steel lubricated static friction coefficient 0 16 drops to 0 04 when sliding is initiated. Based on the data you enter if the ratio m m is exactly equal to the selected μ no motion will occur. F max μ f n. F max frictional force n lb μ static μ s or kinetic μ k frictional coefficient f n applied normal force n lb the frictional force for dynamic friction can be expressed as.

Coefficient of friction friction force develops between contacting surfaces of two bodies and acts to resist relative motion between the bodies. The kinetic friction equation can be written as. Materials and material combinations. The coefficient of kinetic friction is the ratio f w or mg mg or simply m m.

It should be noted that there can be significant differences between static friction typically higher and kinetic sliding friction.