NUMERICAL CALCULATION OF DYNAMIC STRESS INTENSITY FACTORS FOR A SINGLE HOLE-EDGE SLANT CRACK IN A FINITE PLATE

The finite element method is used to solve the problem of a single edge slant crack emanating from a circular hole in a finite plate subjected to a compressive impact loading. The square-root stress singularity around the crack tip is simulated by quarter point singular elements. The dynamic stress intensity factors (DSIFs) are evaluated by using the displacement correlation technique. The numerical results show that with increasing friction the tangential relative displacemnts at the crack edges and dynamic stress intensity factors for mode Ⅱ decrease, and if the contact interactions between the crack surfaces is ignored, the negative DSIFs for mode Ⅰ may be obtained and a physically impossible interpenetration of the crack surfaces will occur. The frictional contact between the crack surfaces has a significant influence on DSIFs for mode Ⅱ.