Paper number 757

MIXED MODE I AND II STRESS INTENSITY FACTORS FOR EDGE CRACKS IN ANISOTROPIC INFINITE STRIPS

Haiying Huang and George A. Kardomateas

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0150 USA

Summary

The Mode I and II stress intensity factors in a fully anisotropic infinite strip with a single-edge or double-edge crack configuration are obtained from an approach based on the continuous dislocation technique. The elastic solution of a single dislocation in an anisotropic half plane is used in conjunction with an array of dislocations along the boundary of the infinite strip, which is supposed to be traction-free, to provide the solution of a single dislocation in an anisotropic infinite strip. This solution is then applied to calculate the mixed mode I and II stress intensity factors for a single-edge and a double-edge crack in the anisotropic strip, by replacing the cracks with a series of dislocations and satisfying the crack surface traction-free conditions. Results are presented for a graphite/epoxy in a unidirectional construction with the fiber orientation varying between 0 and 90 degrees.

Keywords

crack, failure, fracture, dislocations.