An Investigation of the Rotating-Ream Test for Low-Cycle Fatigue Crack Propagation Studies

摘要

A method is described for investigating the low-cycle fatigue behavior of high-strength, notch-tough materials using standard rotating beam fatigue machines. The method includes the application of tensile tests on partially fatigued specimens to obtain notch tensile-strength and crack depth information. An analysis based on experimental data from HY-80 steel specimens of three sizes and three heat-treatments is presented. Crack depth and crack propagation rate are employed as parameters in the analysis.nIt is shown that the. test can detect differences in low-cycle fatigue performance resulting from specimen size and heat-treatment. Variations in performance are found to correlate well with corresponding variations in the Charpy V energy values and the notch tensile strength to yield strength ratios for the materials tested. The test appears promising as a laboratory means for comparing the low-cycle fatigue performance of various materials.