Premium
A CRITICAL REVIEW OF CRACK TIP STRESS INTENSITY FACTORS FOR SEMI‐ELLIPTIC CRACKS *
Author(s) -
SCOTT P. M.,
THORPE T. W.
Publication year - 1981
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1981.tb01127.x
Subject(s) - stress intensity factor , intersection (aeronautics) , bending , tension (geology) , structural engineering , crack closure , stress concentration , stress (linguistics) , point (geometry) , paris' law , materials science , fracture mechanics , mechanics , mathematics , engineering , composite material , geometry , physics , ultimate tensile strength , linguistics , philosophy , aerospace engineering
Several crack tip stress intensity factor solutions have been published for semi‐elliptic, surface breaking cracks in plates subjected to tension or bending forces. These solutions do not agree with each other particularly well and the basis for choosing which one is the best has not been established. In this paper, the development of fatigue crack shape is used as a diagnostic tool to test the accuracy of these theoretical stress intensity solutions in predictive fatigue crack growth calculations. Those solutions giving the best engineering estimate of crack tip stress intensity factors are identified. Single equations are also given for each loading case at the deepest point or surface intersection point of semi‐elliptic cracks in order to facilitate calculations on programmable calculators. A rational basis for calculating the progress of a crack which snaps through the thickness and continues to propagate in a stable way by fatigue is suggested.