Acta Metall Sin  1993, Vol. 29 Issue (9): 11-17    DOI:

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FRACTAL DIMENSIONS OF HYDROGEN INDUCED BRITTLE FRACTURE OF TITANIUM ALUMINIDE

ZHANG Yue;KONG Feng;WANG Yanbin;QIAO Lijie;CHU Wuyang;XIAO Jimei University of Science and Technology Beijing

ZHANG Yue;KONG Feng;WANG Yanbin;QIAO Lijie;CHU Wuyang;XIAO Jimei University of Science and Technology Beijing. FRACTAL DIMENSIONS OF HYDROGEN INDUCED BRITTLE FRACTURE OF TITANIUM ALUMINIDE. Acta Metall Sin, 1993, 29(9): 11-17.

Abstract References Related Articles Recommended Metrics Download:  PDF(1223KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The relation between the Stress intensity factor K_I~* required for brittle crackinitiation and propagation and the fractal dimension D_F of the fracture surface was derived,l.e.lnK_I~* =(1/2)ln2γE'+(1/2)ln(d_f/L_0)·(1-D_F)where d_f is the fracture unit, L_0 a material constant, γ the real surface energy andE=E/(1-v~2). The surface energy can be calculated from the measured linear relation of thelnK_I vs D_F The equation is not only suitable for the overloaded cracking but also for the de-layed cracking (e.g. hydrogen induced cracking and stress corrosion cracking). The experi-mental results showed that the hydrogen induced delayed cracking occurred inTi-24Al-11Nb during charging, and the threshold stress intensity value was low i.e.K_(IH)/K_(IC)= 0.43. The relation between the stress intensity factor K_I~* and D_F measured by ex-periment was consistent with the theoretical equation. Key words:  Ti-24Al-11Nb      hydrogen induced cracking      fractal dimension      Received:  18 September 1993      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/Y1993/V29/I9/11 1 Mandelbrot B B, Passoja D E, Paullay A J. Nature, 1984; 308: 721 2 Lung C W. In: Pietronero L, Tosatti E eds., Fractals in Physics, Elsevier Science, 1986: 189 3 Pande C S, Richards L E, Louat N, Dempsey B D, Schwoeble A J. Acta Metall, 1987: 35: 1633 4 Underwood E E, Banerji K. Mater Sci Eng, 1986; 80: 1 5 Dauskardt R H, Haubensak F, Ritchie O. Acta Metall, 1990; 38: 143 6 穆在勤,龙期威.金属学报,1988;24:A142 7 穆在勤,李淑清,龙期威.材料科学进展,1990;4:247 8 龙起易,李淑清,龙期威.材料科学进展,1990;4:241 9 苏辉,张玉贵,阎振启 金属学报,1989;23:A466 10 陈军,龙起易,陈继克,龙期威.中国腐蚀与防护学报,1991;11:344 11 Chu Wuyang, Thompson A W. 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