EFFECTS OF STRESS RATIO AND LOADING FREQUENCY ON CORROSION FATIGUE CRACK GROWTH BEHAVIOUR FOR GC-4 STEEL

J Chin Soc Corr Pro

1994, Vol. 14

Issue (2): 95-105 DOI:

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EFFECTS OF STRESS RATIO AND LOADING FREQUENCY ON CORROSION FATIGUE CRACK GROWTH BEHAVIOUR FOR GC-4 STEEL

Lu Minxu; Zheng Xiulin(Northwestern Polytechnical University)

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Abstract Effects of stress ratio at five levels and loading frequency at four levels on corrosion fatigue crack growth(CFCG) behaviour in 3.5% NaCl solution for GC--4(40CrMnSiMoVA) steel were studied experimentally. Test results about stress ratio effect sLow that there are two plateaus, i.e. PⅠ and PⅡ, in da/dt vs Kmax curve for CFCG as R >0.5 and (da/dt)pⅡ<(da/dt)pⅠ but only one plateau exists as R <0.3. The essential causes for the two Plateau phenomena were tentatively explored, but complete theoretical explanation still needs forther investigation. Test results about frequency effect show that values of stress intensity factor amplitude, △Kp, in onset point of plateau in da/dN vs △K curve for CFCG decrease in a power function manner with the increase of frequency. The corresponding theoretical functional expression of △Kp vs f curve was also derived in this paper, based on comprehensive analysis of three respects of surface electrochemical reaction dynamics, crack tip surface deformation dynamics and hydrogen diffusion dynamics in material interior st crack tip. This expression is well consistent with experimental functional relation shin in test data.

Key words: Corrosion fatigue crack growth stress ratio loading frequency

Received: 25 April 1994

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Lu Minxu; Zheng Xiulin(Northwestern Polytechnical University). EFFECTS OF STRESS RATIO AND LOADING FREQUENCY ON CORROSION FATIGUE CRACK GROWTH BEHAVIOUR FOR GC-4 STEEL. J Chin Soc Corr Pro, 1994, 14(2): 95-105.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I2/95

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