A method of fatigue life prediction in notched and un-notched components

Abstract The present study intends to assess the fatigue damage of un-notched and notched components using a newly developed energy-based critical plane fatigue damage parameter. The parameter integrates the normal and shear energies calculated on the critical plane on which the stress and strain Mohr's circles are the largest during the loading and unloading parts of a cycle. For notched fatigue data, Neuber's analysis has been used to calculate the local stress and strain components at the notch root. The developed fatigue damage approach is used to predict the fatigue life of notched and un-notched components made of Haynes 188, 1045 steel, 4340 steel, 1020 HR sheet steel, high strength steel, aluminum alloys 2024-T3 and 7075-T6 subjected to tension, torsion and tension-torsion loading conditions. The predicted fatigue lives were found in very good agreement with the experimental fatigue life reported in the literature.

[1]  Darrell F. Socie,et al.  Multiaxial Fatigue: Analysis and Experiments , 1989 .

[2]  Soon-Bok Lee,et al.  A critical review on multiaxial fatigue assessments of metals , 1996 .

[3]  S Kalluri,et al.  In-Phase and Out-of-Phase Axial-Torsional Fatigue Behavior of Haynes 188 Superalloy at 760°C , 1993 .

[4]  Drew V. Nelson,et al.  Advances in multiaxial fatigue life prediction for components with stress concentrations , 1997 .

[5]  F. Guiu,et al.  ON THE NUCLEATION OF FATIGUE CRACKS IN PURE POLYCRYSTALLINE α‐IRON , 1982 .

[6]  K. Chawla,et al.  Mechanical Behavior of Materials , 1998 .

[7]  H. O. Fuchs,et al.  Metal fatigue in engineering , 2001 .

[8]  Z. G. Wang,et al.  Fatigue crack initiation and propagation in an α-iron polycrystal , 2001 .

[9]  Jayanta Das,et al.  Multiaxial fatigue life prediction of a high temperature steam turbine rotor using a critical plane approach , 2000 .

[10]  T. Topper,et al.  CONFOCAL SCANNING LASER MICROSCOPY MEASUREMENTS OF THE GROWTH AND MORPHOLOGY OF MICROSTRUCTURALLY SHORT FATIGUE CRACKS IN A1 2024‐T351 ALLOY , 1996 .

[11]  A. Varvani-Farahani,et al.  A new energy-critical plane parameter for fatigue life assessment of various metallic materials subjected to in-phase and out-of-phase multiaxial fatigue loading conditions , 2000 .

[12]  R. Sanford.  Fracture Mechanics: Fifteenth Symposium , 1984 .

[13]  James Alfred Ewing,et al.  The fracture of metals under repeated alternations of stress , 1903, Proceedings of the Royal Society of London.

[14]  D. Socie,et al.  Observations of cracking behavior in tension and torsion low cycle fatigue , 1988 .

[15]  Ne Dowling,et al.  Fatigue Life Estimation of Notched Members , 1984 .