A MODEL OF BRITTLE-DOMINATED WEAR DUE TO DELAYED FRACTURE (VERTICAL CRACK-GROWTH)

The purpose of this work is to develop the model of delayed fracture i n brittle wear and in particular to show some effects of the activatio n energy, temperature,load, sliding velocity and size of contact on cr ack growth. The model of a pre-existing vertical crack loaded under se vere wear in brittle materials with small and large grain sizes is con sidered taking into account the process zone ahead of crack. The depen dence, characterizing influence of time and temperature on fracture is used. The expression for K-I and K-II are found and numerical procedu re to calculate crack growth is elaborated. The influence of different parameters on crack length and stress intensity factors is discussed. The limitations of the model considered are analyzed. The prospects o f further application of the considered model of delayed fracture unde r brittle wear are discussed.