Coefficient Of Kinetic Friction Of Sheet Metal

The value of μsis generally higher than the value of μkfor a given combination of materials.

Coefficient of kinetic friction of sheet metal.

To cause motion you need to slightly increase m the hanging mass by 0 1 gram for example. The coefficient of kinetic friction is the ratio f w or mg mg or simply m m. Coefficient of friction friction force develops between contacting surfaces of two bodies and acts to resist relative motion between the bodies. In the micro sheet metal roll forming process the kinetic friction is significant indicating the real contact area is affected by the junction growth effect according to brizmer et al.

Design resources friction design data. Where μsis the coefficient of static friction and μkis the coefficient of kinetic friction. It is expressed in newtons n. 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. Based on the data you enter if the ratio m m is exactly equal to the selected μ no motion will occur. 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. Since friction is a force the unit of the frictional force is the newton n.

The force of kinetic friction is μk times the normal force on a body. The kinetic friction equation can be written as. Hence the real contact area must be recalculated for the accurate description of friction behavior. It should be noted that there can be significant differences between static friction typically higher and kinetic sliding friction.

Materials and material combinations. 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. 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. This paper presents the derivation of a first order friction model for lubricated sheet metal forming.

The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion.