Acta Metall Sin  1993, Vol. 29 Issue (6): 13-21    DOI:

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ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH

WANG Zhongguang;AI Suhua State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Academia Sinica; ShenyangZHENG Yessha;post-doctoral.Shanghai Institute of Coramics.Academia Sinica.Shnaghai 300050

WANG Zhongguang;AI Suhua State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Academia Sinica; ShenyangZHENG Yessha;post-doctoral.Shanghai Institute of Coramics.Academia Sinica.Shnaghai 300050. ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH. Acta Metall Sin, 1993, 29(6): 13-21.

Abstract References Related Articles Recommended Metrics Download:  PDF(767KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The mixed-mode (Ⅰ/Ⅱ) fatigue crack growth threshold was studied. The fa-tigue crack growth threshold value of pure mode Ⅱ in dual-phase steel(DPS) was found to be1.9 times of that of pure mode Ⅰ; the tensile stess strength factor range of pure mode Ⅱbranch crack tip is 2.2 times of that of pure mode Ⅰ. The roughness-induced shear resistanceimpedes the mode Ⅱ crack growth; while roughness-induced crack closure reduces the drivingforce of mode Ⅰ crack tip; the resistance of the former is larger than that of the latter. Themode Ⅱ component in near-threshold fatigue crack growth may increase the plasticity ofcrack tip which accelerates the crack growth and introduce crack surface contact and rub toreduce the crack propagation rate. The difficulty for quantifying the shear resistance is readilysolved through measurement of crack closure in this paper. The friction shear stress strengthfactor range of pure mode Ⅱ still is far larger than the closure stress strength factor range ofpure mode Ⅰ. It is illustrated that the roughness enlarged the second role and played a role ofshielding crack tip from mode Ⅱ crack. Key words:  mixed-mode      fatigue crack growth threshold      crack closure      roughness      shear resistance      Received:  18 June 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/I6/13 1 Gao H, Brown M W, Miller K J. Fatigue Engng Mater Struct, 1982; 5 (1) : 117 2 Wang K J, Hsu C L, Kao H. Proc I CFA, 1977; 4: 123--133． Pergamon press. 3 Gao H, Wang Z, Yang C, Zhou Z. Acta Metall. Sin, 1979; 15: 380--391． 4 Maccagno T M, Knott J F. Engng Fract Mech, 1989; 34 (1) : 65--86 5 Tanaka K. Engng Fract Mech, 1974; 6: 493 6 Liu H W. 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[14] WEI Xuejun; LI Jin; KE Wei(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015); (State Key Laboratory of Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-08-23). INFLUENCE OF SUPERPOSED SMALL LOADS ON FATIGUE CRACK PREPAGATION RATE OF A537 STEEL[J]. 金属学报, 1996, 32(5): 504-509. [15] LI Xiaowu; TIAN Jifeng; KANG Yan; WANG Zhongguang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1994-11-23; in revised form 1995-03-03). QUANTITATIVE ANALYSIS ON SURFACE ROUGHNESS OF FRACTURE[J]. 金属学报, 1995, 31(19): 311-317. No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed