THE DISCONTINUITY DISPLACEMENT METHOD APPLIED TO 3-DIMENSIONAL COPLANAR CRACK PROBLEM FOR ANY BOUNDARY-VALUE CONDITION

The fundamental solution of discontinuity displacement for a three-dim ensional problem is put forward by use of the Hankel transformation me thod and then the accurate solutions of discontinuity displacement in rectangular and triangular areas are obtained. One set of linear algeb raic equations is given for arbitrary boundary values according to str ess and displacement conditions on the crack surface, and a numerical method for obtaining the stress intensity factor using crack surface d iscontinuity displacements is established. It can be seen from many ca lculation results that the degree of accuracy of this method (disconti nuity displacement method, DDM) is very high even though the element n umber is small. Combined with the boundary element method, this numeri cal method can also solve the finite cracked body problem.