| Civil and Mechanical Engineering |
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| Two-parameter characterization of low cycle, hysteretic fatigue data |
| Sheng Bao, Wei-liang Jin, Sidney A. Guralnick, Thomas Erber |
| Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China, Department of Civil Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA, Department of Physics, Illinois Institute of Technology, Chicago, IL 60616, USA, Department of Applied Mathematics, Illinois Institute of Technology, Chicago, IL 60616, USA |
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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 N2 and N3. Experimental results show that although fatigue life Nf ranges from 2644 cycles to 108 992 cycles, the ratios of N2/Nf and N3/Nf tend to be stable: N2/Nf=10.7%, N3/Nf=91.3%.
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Received: 14 December 2009
Published: 02 June 2010
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