Coefficient Of Friction Sheet Metal

The coefficient of static friction typically denoted as μ s is usually higher than the coefficient of kinetic friction.

Coefficient of friction sheet metal. For polished oiled metal surfaces less than 0 1. Swadesh kumar singh k. The determination of the friction coefficient in a sheet metal forming process is a complex procedure because many variables influence the friction mechanisms. Static and kinetic coefficient of friction.

Showing the concept of coefficient of friction. The frictional force can be expressed as. The aim of this research work is to apply an experimental approach in order to bridge simple benchmark friction experiments with real sheet forming applications. N normal force between the surfaces n lb there are at least two types of friction forces.

The dynamic coefficient of friction are. Simplified models are given for different conditions of sheet metal forming processes. F f μ n 1. The friction force is the force exerted by a surface when an object moves across it or makes an effort to move across it.

For example static friction can prevent an object from sliding down a sloped surface. For glass on glass 0 4. μ static μ s or kinetic μ k frictional coefficient. Mahesh apurv kumar m.

The ratio between the force of friction and the contact force between the two moving objects is represented by a coefficient of friction µ whose value will depend on the tribology system itself and the forming process such as temperature of the sheet ram velocity contact pressure and the strains in the sheet. Swathi understanding formability of extra deep drawing steel at elevated temperature. The static and kinetic friction coefficient values reference table shown in this article will be helpful for finding the cof values of commonly used materials. Coefficients of friction between materials are best determined through testing.

Where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction. However it is possible to find tables in the literature for friction coefficients between various materials. For rubber on tarmac close to 1 0. The value of μ s is generally higher than the value of μ k for a given combination of materials.

In sheet metal forming different friction regimes may occur depending on the lubricant amount and surface topographies of the tool and sheet metal. F f frictional force n lb. Static friction is friction between two or more solid objects that are not moving relative to each other. Typical values for the coefficient of friction when sliding is occurring i e.

The coefficient of friction is one of the key parameters in fe simulations of forming processes which can influence the prediction accuracy of these analyses.