Abstract:

In view of the residual stress redistribution induced by the crack propagation process, the prediction model of residual stress redistribution along with the crack propagation is established based on the Hull-Rimmer theory. And the influence law of the residual stress redistribution on the damage process is achieved by using the total stress intensity factor and the corresponding criterion. Also the established prediction model of residual stress redistribution is used to analysis the two cases propagate perpendicular to the weld and a case propagate along the weld direction, and based on which the propagation velocity of crack is predicated by considering the redistribution of residual stress. It can be found from the results that the average error between results of prediction model based on the Hull-Rimmer theory and experimental results is 4.86%, which is of great significance for the prediction study of residual stress redistribution phenomena and subsequent crack propagation.

Key words: crack propagation, redistribution, residual stress, Hull-Rimmer theory