1. Fatigue thresholds of holed components under in-phase and out-of-phase torsional and axial loadings.
- Author
-
TANAKA, K., MORITA, K., and AKINIWA, Y.
- Subjects
R-curves ,FRACTURE mechanics ,MATERIAL fatigue ,STRENGTH of materials ,STRAINS & stresses (Mechanics) ,CARBON steel - Abstract
The resistance-curve ( R-curve) method was applied to the prediction of the fatigue thresholds of notched components under in-phase and out-of-phase combinations of cyclic torsion and axial loadings. The prediction was compared with the experimental data obtained from thin-walled tubular specimen of medium-carbon steel with a hole. The stress was completely reversed and the mean stress was zero. The crack was nucleated at the position of the maximum range of the circumferential stress on the periphery of a hole, and propagated almost straight for all cases examined. The experimental data of the thresholds for crack initiation and fracture agreed well with the predictions for in-phase and for out-of-phase loadings with 45° phase difference. For out-of-phase loading with 90°, the threshold for fracture was close to the crack initiation limit, because of the reduction of crack closure due to crack face rubbing by mode II shear cycling. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF