Two-parameter characterization of low cycle, hysteretic fatigue data |
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| Authors: | Sheng Bao Wei-liang Jin Sidney A Guralnick and Thomas Erber |
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| Abstract: | The aim of this research is to characterize the development of fatigue damage by means of stress-strain hysteresis. Experiments
were conducted on 14 specimens made of cold-finished unannealed AISI 1018 steel. Results demonstrate that the mechanical hysteresis
loop areas, when plotted as a function of the number of loading cycles, show significant variations and demonstrate the three
principal stages concerning the progress of the fatigue failure—initial accommodation, accretion of damage and terminal failure.
These three stages of fatigue are marked by the transitions at cycles N
2 and N
3. Experimental results show that although fatigue life N
f ranges from 2644 cycles to 108 992 cycles, the ratios of N
2/N
f and N
3/N
f tend to be stable: N
2/N
f=10.7%, N
3/N
f=91.3%. |
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| Keywords: | |
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