2-DIMENSIONAL PRINCIPAL VALUE HYPERSINGULAR INTEGRALS FOR CRACK PROBLEMS IN 3-DIMENSIONAL ELASTICITY

A principal value definition of the basic hypersingular integral in the fundamental integral equation for two-dimensional cracks in three-dimensional isotropic elasticity is proposed. As is the case with the corresponding definitions of Cauchy-type one-dimensional and two-dimensional principal value singular integrals, as well as Mangler-type one-dimensional principal value hypersingular integrals, the present definition is based on the special consideration of an appropriate region around the singular point. The cases of circular, square and equilateral triangular regions are considered in some detail. © 1990 Springer-Verlag.