An experimental study of fatigue crack initiation and growth from coldworked holes

Abstract The behavior of specimens with holes that were coldworked by radial expansion was studied. The initiation and growth of fatigue cracks was observed for a remote cyclic loading that generated stresses at the hole edge slightly above the yield stress. Coldworking affected the growth rate, not the initiation. Strains near the hole were measured with the moire technique and used to predict the initiation of cracks in the noncoldworked specimens with reasonable accuracy. Stress intensity factors computed with a linear elastic superposition procedure compared favorably with those measured by crack growth and displacement techniques for cracks longer than 1 mm.

[1]  Sathya Hanagud,et al.  Stress Corrosion Susceptibility of Stress-Coined Fastener Holes in Aircraft Structures , 1975 .

[2]  J Morrow,et al.  Techniques for Smooth Specimen Simulation of the Fatigue Behavior of Notched Members , 1972 .

[3]  R. G. Forman,et al.  Elastic-plastic analysis of an infinite sheet having a circular hole under pressure , 1975 .

[4]  W. Sharpe,et al.  Biaxial laser-based displacement transducer. , 1978, The Review of scientific instruments.

[5]  O. L. Bowie.  Analysis of an Infinite Plate Containing Radial Cracks Originating at the Boundary of an Internal Circular Hole , 1956 .

[6]  Albert S. Kobayadhi.  Experimental Techniques in Fracture Mechanics , 1975 .

[7]  S. Timoshenko,et al.  Theory of elasticity , 1975 .

[8]  W. N. Sharpe,et al.  Measurement of the Elastic-Plastic Boundary Around Coldworked Fastener Holes , 1978 .

[9]  John Francis Martin,et al.  Fatigue Damage Analysis for Irregular-Shaped Structures Subjected to Representative Loads , 1974 .

[10]  S. S. Manson,et al.  Fatigue Behavior of Materials under Strain Cycling in Low and Intermediate Life Range , 1963 .

[11]  T. W. Orange.  Crack Shapes and Stress Intensity Factors for Edge-Cracked Specimens , 1971 .

[12]  Tim Topper,et al.  NEUBER'S RULE APPLIED TO FATIGUE OF NOTCHED SPECIMENS , 1967 .

[13]  A. F. GrandtJr..  Stress intensity factors for some through-cracked fastener holes , 1975 .

[14]  William F. Adler,et al.  Stress Analysis of Coldworked Fastener Holes. , 1974 .

[15]  H. Neuber.  Theory of Stress Concentration for Shear-Strained Prismatical Bodies With Arbitrary Nonlinear Stress-Strain Law , 1961 .

[16]  R. Howland,et al.  On the Stresses in the Neighbourhood of a Circular Hole in a Strip under Tension , 1930 .

[17]  R. M. Potter,et al.  The problem of forced fittings , 1975 .

[18]  G. Cloud.  Slotted Apertures for Multiplying Grating Frequencies and Sharpening Fringe Patterns in Moire Photography , 1976 .

[19]  Elbridge Z Stowell,et al.  Stress and strain concentration at a circular hole in an infinite plate , 1950 .