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 de...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%.展开更多
基金supported by the National Natural Science Foundation of China (No. 50901067)the Technological Research and Development Programs of the Ministry of Railways of China (No. 20101007-EG)the Julian S. SCHWINGER Foundation,USA
文摘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%.
