TORSIONAL INTERACTION OF A PENNY-SHAPED CRACK AND AN EXTERNAL CIRCULAR CRACK IN A TRANSVERSELY ISOTROPIC MATERIAL

摘要

The interactive effects of an internal penny-shaped crack and an external circular crack in a transversely isotropic material under torsional loading is investigated using the techniques of multiple integral representations and multiplying factors. The boundary conditions of the problem have three different parts. The stress intensity factors at the inner and the outer crack tips are obtained in exact expressions as the products of a dimensional quantity and non-dimensional functions. The present of an internal penny-shaped crack is shown to have a strong effect on the magnitude of the stress intensity factor of the external circular crack.