Abstract
Sliding contact is investigated between a soft metal surface (duralumin) and a hard protuberance ball (steel). The frictional coefficient in this case does not obey Amonton's law of friction, and it increases with an increase of normal load. The experimental value of the frictional coefficient agrees well with the calculated one. In the calculation, the variation of work-hardened depth corresponding to normal force is taken into consideration. It is confirmed that the normal force dependence of the frictional coefficient is generated from the contact pressure determined by the work-hardened depth corresponding to normal force, and from the ploughing effect.
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