The mechanism of surface interaction in dry sliding is attributed either to a constant friction coefficient or to a constant friction shear stress. This paper investigates these assumptions in the case of circular rigid punches sliding against the elastic half-space bounding plane. Normal displacements generated by these interactions are calculated. It is found that these do not comply with front surface of the punch in the case of a constant friction coefficient, whereas a perfect agreement arises when a constant friction shear stress is assumed.

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