THREE-DIMENSIONAL STATE OF STRESS AT THE VERTEX OF A QUARTER INFINITE CRACK IN A HALF-SPACE

摘要

Along the front of the quarter-infinite crack (z-axis) the so called stress intensity factor behaves like zλ-½(z +0) and thus tends to zero, respectively to infinity, accordingly to ReX being < -½ or ＞ -½. But in the region z, r →0 the notion stress-intensity factor loses its meaning.nThe sought state of stress passes into the well-known state of plane strain around a crack tip if Poisson's ratio (a) tends to zero.nThe computed state of stress for the incompressible medium (o = ½) is confirmed by experiment.