ENGINEERING THE SURFACES OF MACHINE ELEMENTS
The paper considers the interaction of operational properties of machine elements. The qualitative interrelations between operational properties used to solve the optimization problem relating the choice or design of the machine element provided with the set fun c-tionality and durability are defined. Solution to the optimization problem referring the de-sign of the machine elements concerns such operational properties as durability, contact durability, fatigue durability, rigidity, contact rigidity, wear resistance, fretting wear, fri c-tion, vibration resistance, tightening ability, size stability (considered in terms of relaxation and creep strength of materials).