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| CORROSION FATIGUE CRACK INITIATION IN A MODE Ⅱ NOTCH SPECIMEN |
| by CHU Wuyang; XIAO Jimei (C. M. Hsiao); ZHAO Yusheng (Beijing University of Iron and Steel Technology)(Manuscript received 27 August; 1985) |
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Cite this article:
by CHU Wuyang; XIAO Jimei (C. M. Hsiao); ZHAO Yusheng (Beijing University of Iron and Steel Technology)(Manuscript received 27 August; 1985). CORROSION FATIGUE CRACK INITIATION IN A MODE Ⅱ NOTCH SPECIMEN. Acta Metall Sin, 1987, 23(5): 396-402.
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Abstract The stress intensity K_Ⅱ of a mode Ⅱ specimen was calculated using a finite element method via the J integral. The site direction and threshold value for crack initiation from the notch under cyclic mode Ⅱ loading in air, in water and under dynamic charging with hydrogen were investigated. The results showed that the mode Ⅱ fatigue crack in a high strength steel initiated at or close to the site of the maximum principal stress, rather than at the site of the maximum shear stress, and the subsequent crack growth was orientated approximately normal to the direction of the maximum principal stress. The site and direction of crack initiation in water and under dynamic charging with hydrogen were similar but different from that in air. The threshold values for crack initiation in air, in water and under dynamic charging were 28.8, 12.3 and 10.2 MPa·m~(1/2), respectively. The fracture surface of a corrosion fatigue crack in water and under dynamic charging consisted of intergranular facets at low △K_Ⅱ values but of quasi-cleavage at higher △K_Ⅱ values and were different than those in air.
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Received: 18 May 1987
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