The application of fracture mechanics to surface cracks in shafts

Abstract A theoretical method was developed for calculating the stress intensity factor ( K ) for semielliptical surface cracks in shafts subjected to a constant moment load. A number of tests using 2-and 3-dimensional photoelasticity showed good agreement with the theoretical model. The calculated K was then used in computer predictions of crack propagation characteristics which were subsequently tested using high strength steel shafts. The theoretical model is useful for predicting critical crack depths and lifetimes for the particular geometry, crack shape and load configuration investigated.

[1]  R. Shah,et al.  Stress Intensity Factor for an Elliptical Crack Approaching the Surface of a Plate in Bending , 1972 .

[2]  Jan Cernosek,et al.  Three-dimensional photoelasticity by stress freezing , 1980 .

[3]  X. R. Wu,et al.  Stress intensity factors for half-elliptical surface cracks subjected to complex crack face loadings , 1984 .

[4]  D. J. Cartwright,et al.  Strain energy release rates for a straight-fronted edge crack in a circular bar subject to bending , 1984 .

[5]  C. Ruiz,et al.  Photoelastic determination of stress intensity factors for single and interacting cracks and comparison with calculated results. Part I: Two-dimensional problems , 1984 .

[6]  W. D. Dover,et al.  The stress intensity factor for a deep surface crack in a finite plate , 1979 .

[7]  A. Din,et al.  Stress intensity factors for fatigue cracking of round bars , 1981 .

[8]  R. Forman,et al.  Numerical Analysis of Crack Propagation in Cyclic-Loaded Structures , 1967 .

[9]  Albert S. Kobayashi,et al.  Stress intensity factor for an elliptical crack under arbitrary normal loading , 1971 .

[10]  A. Athanassiadis,et al.  Linear elastic fracture mechanics computations of cracked cylindrical tensioned bodies , 1981 .

[11]  C. W. Smith,et al.  Use of three-dimensional photoelasticity in fracture mechanics , 1973 .

[12]  C. Smith,et al.  Crack-tip measurements in photoelastic models , 1982 .

[13]  W. F. Riley,et al.  Experimental stress analysis , 1978 .

[14]  R. Heywood,et al.  Photoelasticity for designers , 1969 .

[15]  J. W. Dally,et al.  A critical review of methods for determining stress-intensity factors from isochromatic fringes , 1977 .