| SLOW PROPAGATION OF FATIGUE CRACK NEAR THRESHOLD |
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| 作者姓名： | DENG Rongying ZHOU Aihua JIANG Huaiqing LI Chunxiu Institute of Mechanics Academia Sinica Beijing ChinaZHANG Liqing SUN Yutian Beijing Institute of Engineering Beijing China [Originally published in ACTA METALL SIN |
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| 作者单位： | DENG Rongying ZHOU Aihua JIANG Huaiqing LI Chunxiu Institute of Mechanics，Academia Sinica，Beijing，China
ZHANG Liqing，SUN Yutian Beijing Institute of Engineering，Beijing，China [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A219—A225，Associate Profes sor，Institute of Mechanics，Academia Sinica，Beijing，China |
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| 摘 要： | The effect of pearlite interlamellar spacing(d)from 0.31 to 0.77 μm of T8 steel on fatiguecrack propagation near threshold has been investigated at different stress ratios(R).Theclosure stress intensity factor(K_(cl)),the threshold value(ΔK_(th))and crack tip opening dis-placement range(ΔCOD)were measured.The results show that pearlite interlamellar spac-ing in this range has no effect on K_(cl),but has effect on the threshold value in low stress ratio.The threshold value is higher for materials with larger interlamellar spacing.No matter whatthe stress ratio is,during the propagation near threshold,the propagation rate will be thesame,provieded the crack tip opening displacement range is the same.Metallurgical examinations were also carried out to show that the crack propagationpath is sensitive to mierostructure.The crack always propagates along either boundary ofpearlite colony or ferrite lamellar in pearlite.
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| 收稿时间： | 1989-12-25 |
| 修稿时间： | 1989-12-25 |
SLOW PROPAGATION OF FATIGUE CRACK NEAR THRESHOLD |
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| DENG Rongying ZHOU Aihua JIANG Huaiqing LI Chunxiu Institute of Mechanics,Academia Sinica,Beijing,China
ZHANG Liqing,SUN Yutian Beijing Institute of Engineering,Beijing,China Originally published in ACTA METALL SIN.SLOW PROPAGATION OF FATIGUE CRACK NEAR THRESHOLD[J].Acta Metallurgica Sinica(English Letters),1989,2(6):439-443. |
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| Authors: | DENG Rongying ZHOU Aihua JIANG Huaiqing LI Chunxiu Institute of Mechanics Academia Sinica Beijing China
ZHANG Liqing SUN Yutian Beijing Institute of Engineering Beijing China [Originally published in ACTA METALL SIN |
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| Abstract: | The effect of pearlite interlamellar spacing(d)from 0.31 to 0.77 μm of T8 steel on fatigue crack propagation near threshold has been investigated at different stress ratios(R).The closure stress intensity factor(K_(cl)),the threshold value(ΔK_(th))and crack tip opening dis- placement range(ΔCOD)were measured.The results show that pearlite interlamellar spac- ing in this range has no effect on K_(cl),but has effect on the threshold value in low stress ratio. The threshold value is higher for materials with larger interlamellar spacing.No matter what the stress ratio is,during the propagation near threshold,the propagation rate will be the same,provieded the crack tip opening displacement range is the same. Metallurgical examinations were also carried out to show that the crack propagation path is sensitive to mierostructure.The crack always propagates along either boundary of pearlite colony or ferrite lamellar in pearlite. |
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| Keywords: | pearlitic steel fatigue crack propagation threshold opening displacement |
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