Formation mechanism of inclined fatigue-cracks in ultrafine-grained Cu processed by equal channel angular pressing

被引：14
作者：
Goto, M. [1 ]
Han, S. Z. [2 ]
Yamamoto, T. [1 ]
Kitamura, J. [1 ]
Ahn, J. H. [2 ]
Yakushiji, T. [3 ]
Kim, S. S. [4 ]
Lee, J. [5 ]
机构：
[1] Oita Univ, Dept Mech Engn, Oita 8701192, Japan
[2] Korea Inst Mat Sci, Struct Mat Div, Chang Won 642831, South Korea
[3] Oita Natl Coll Technol, Dept Mech Engn, Oita 8701052, Japan
[4] Gyeongsang Natl Univ, Dept Mat Sci & Engn, Chinju 660701, South Korea
[5] Chagwon Natl Univ, Dept Met & Adv Mat Engn, Chang Won 641773, South Korea
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2016年 / 92卷
关键词：
Equal channel angular processing; Fatigue crack; Aspect ratio; Copper; Stress intensity factor; SEMIELLIPTIC SURFACE CRACK; STRESS INTENSITY FACTORS; HIGH-CYCLE FATIGUE; AL-MG ALLOY; DEFORMATION-BEHAVIOR; CARBON-STEELS; SHEAR BANDS; GROWTH LAW; COPPER; FINE;
D O I：
10.1016/j.ijfatigue.2016.02.006
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The formation mechanism of inclined fatigue-cracks in ultrafine-grained Cu processed by equal channel angular pressing was studied by using a partially notched specimen in which a fatal natural crack was introduced, to a specific site of the smooth surface was feasible regardless of microstructural inhomogeneity caused by the processing. The crack growth direction depended on the location along the circumferential direction of the round bar specimen and on the applied stress amplitudes. The role of the Microstructure and deformation mode at the crack-tip areas on the formation behavior of fatal cracks is discussed in terms of the microstructural evolution caused by cyclic stressing and the mixed-mode stress intensity factor. The in-plane shear mode deformation at the crack tip assisted the formation of the inclined crack paths and the unique crack face profile. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：577 / 587
页数：11
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