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| HYDROGEN-INDUCED DELAYED FRACTURE UNDER MODE Ⅱ LOADING |
| by ZHANG Tongyi; CHU Wuyang; LI Ying; XIAO Jimei (Beijing University of Iron and Steel Technology) |
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Cite this article:
by ZHANG Tongyi; CHU Wuyang; LI Ying; XIAO Jimei (Beijing University of Iron and Steel Technology). HYDROGEN-INDUCED DELAYED FRACTURE UNDER MODE Ⅱ LOADING. Acta Metall Sin, 1986, 22(4): 71-73.
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Abstract Hydrogen induced cracking (HIC) of a high strength steel 34CrNi3MoA (TS=1700 MPa) under mode Ⅱ loading was investigated using notched specimens. The stress field around the notch tip was analyzed by means of finite element method. The result shows that the HIC under mode Ⅱ loading initiates at the back of the notch tip, i. e., θ=-110°, where hydrostatic stress has the maximum value. However, cracking is oriented along the shear stress direction at the site, not normal to the direction of maximum principal stress component. On the contrary, if the specimens are loaded to fracture in air under mode Ⅱ loading cracking at the maximum shear stress site around the notch tip and the cracking direction coincides with the direction of the maximim shear stress. The facts above mentioned indicate that hydrogen induced delayed plastic deformation is a necessary condition for HIC.
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Received: 18 April 1986
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1 Tabata, T.; Birnbaum, H.K., Scr. Metall., 17 (1984) , 947．
2 张统一;褚武扬;肖纪美;金属学报,21(1985) ,A370．
3 张统一;褚武扬;肖纪美;中国科学,1986． №3． 316．
4 Wang,Y.B.(王燕斌);Chu,W.Y.(褚武扬);Hsiao,C.M.(肖纪美),Scr.Metall.,19(1985) ,1161．o |
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