A NOVEL PARAMETER FOR EVALUATING THE FATIGUE CRACK GROWTH RATE IN CARBON STEELS
来源期刊：Acta Metallurgica Sinica2001年第4期
论文作者：H.Nisitani S.Q.Zhu N.KAWAGOISHI X.S.WANG
Key words：crack opening displacement; crack growth rate; carbon steel; fatigue;
Abstract: A novel parameter is suggested for evaluating the fatigue crack growth rate in carbonsteels.Fatigue crack propagation tests of an annealed 0.42% carbon steel were carriedout under different conditions to investigate the relationship between this dominatingparameter and the crack opening displacement (COD).A new equation of fatiguecrack growth rate is formulated in terms of the suggested parameter.The physicalmeanings of the material parameters in this equation are explored experimentally.Considering the relation of crack growth and deformation properties,a simple andapplicable method is proposed to evaluate the fatigue crack growth rate.It is alsoobserved that the material parameters in the fatigue crack growth rate equation ofcarbon steels are related linearly to the material strength.The results are in a goodagreement with experimental results.
H.Nisitani1，S.Q.Zhu2，N.KAWAGOISHI3，X.S.WANG2
(1.Faculty of Engineering,Kyushu Sangyuo University,Fukuoka,812,Japan;
2.Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China;
3.Faculty of Engineering,Kagoshima University,Kagoshima,890-0065,Japan)
Abstract:A novel parameter is suggested for evaluating the fatigue crack growth rate in carbonsteels.Fatigue crack propagation tests of an annealed 0.42% carbon steel were carriedout under different conditions to investigate the relationship between this dominatingparameter and the crack opening displacement (COD).A new equation of fatiguecrack growth rate is formulated in terms of the suggested parameter.The physicalmeanings of the material parameters in this equation are explored experimentally.Considering the relation of crack growth and deformation properties,a simple andapplicable method is proposed to evaluate the fatigue crack growth rate.It is alsoobserved that the material parameters in the fatigue crack growth rate equation ofcarbon steels are related linearly to the material strength.The results are in a goodagreement with experimental results.
Key words:crack opening displacement; crack growth rate; carbon steel; fatigue;
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