Wide-range and accurate mixed-mode weight functions and stress intensity factors for cracked discs

摘要

The Wu-Carlsson displacement-based weight function method is extended to obtain the mode I and mode II weight functions for the edge- and centre-cracked discs. Compared with Fett's direct adjustment weight functions for the edge-cracked discs, the present weight functions are more accurate and are applicable for a wider range of crack lengths. Using the present weight functions, extensive and highly accurate mixed-mode stress intensity factors are obtained for the cracked discs subjected to diametrically compressive forces. Assuming perfect contact and using Coulomb friction law and the present weight functions, the mode II stress intensity factors for the cracked discs with consideration of friction are obtained and widely compared with the corresponding results from finite element analyses.