Acta Metall Sin  1997, Vol. 33 Issue (3): 277-286    DOI:

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GROWTH BEHAVIOUR OF SMALL FATIGUE CRACK AND FATIGUE-LIFE PREDICTION FOR HIGH-STRENGTH STEEL 30CrMnSiNi2A

DING Chuanfu;YU Hui; WU Xueren (Beijing Institute of Aeronautical Materials;Beijing 100095)

DING Chuanfu;YU Hui; WU Xueren (Beijing Institute of Aeronautical Materials;Beijing 100095). GROWTH BEHAVIOUR OF SMALL FATIGUE CRACK AND FATIGUE-LIFE PREDICTION FOR HIGH-STRENGTH STEEL 30CrMnSiNi2A. Acta Metall Sin, 1997, 33(3): 277-286.

Abstract References Related Articles Recommended Metrics Download:  PDF(1513KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Single-edge-notched tension (SENT) specimens under constant load amplitude were used to obtain the small crack growth information via an acetate replica method. The observed results show that more cracks are surface ones and initiated at inclusion-particles or voids on the surface of the notch. Steel 30CrMnSiNi2A does not exhibit a significant short crack effect when stress ratio R=0. But a slight small crack effect was observed at R=-1, and the short cracks can grow below the long crack threshold. Using the closure crack growth model and a microstructural defect as an initial crack, the small crack growth rate and the total fatigue life can be predicted and the predicted results are in reasonable agreement with experiments. Key words:  small crack      crack growth rate      fatigue life prediction      Received:  18 March 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I3/277 1 Newman J C Jr, Edwards P R. Advisory Group for Aerospace Research and Development(NATO), AGARD Report No.732,1988 2 吴学仁, Newman J C Jr,李成功, Venneri S L,赵伟, Swain M H,丁传富, Phillips E P.见:崔志华主编,高强度铝合金的小裂纹效应——CAE/NASA的疲劳与断裂力学合作项目,国际科技合作课题论文集,北京:航空工业出版社,1994 3 Newman J C Jr, Wu X R,Venneri S L,Li C G. 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