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Titolo:
Fatigue crack initiation and propagation in an alpha-iron polycrystal
Autore:
Chu, RQ; Cai, Z; Li, SX; Wang, ZG;
Indirizzi:
Chinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture Mat, Shenyang 110015, Peoples R China Chinese Acad Sci Shenyang Peoples R China 110015 110015, Peoples R China
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 313, anno: 2001,
pagine: 64 - 68
SICI:
0921-5093(20010831)313:1-2<64:FCIAPI>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELASTIC STRAIN-ENERGY; CYCLIC DEFORMATION; TRIPLE JUNCTION; SINGLE-CRYSTALS; STRESS; BICRYSTAL;
Keywords:
alpha-iron polycrystal; cyclic deformation; crack initiation and propagation; finite element analysis; crystal orientation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Chu, RQ Chinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture Mat, Shenyang 110015, Peoples R China Chinese Acad Sci Shenyang Peoples R China 110015 Peoples R China
Citazione:
R.Q. Chu et al., "Fatigue crack initiation and propagation in an alpha-iron polycrystal", MAT SCI E A, 313(1-2), 2001, pp. 64-68

Abstract

The cyclic deformation and crack initiation and propagation of alpha-iron polycrystals have been studied under stress-control with emphasis on the dependence on the stress amplitudes and orientation of grains. The orientations of grains surrounding cracks were determined by the electron backscatterdiffraction (EBSD). It was found that cracks did not originate at grain boundaries but along the slip lines intersecting with the free surface at thecorner of the specimen. At lower stress amplitude, the crack propagated ina transgranular mode, but at higher stress amplitude the crack propagated in a mixed mode-transgranular mode and intergranular mode. The stress distribution along the loading axis of grains surrounding the crack was calculated using a three-dimensional anisotropic finite element method (FEM). In the present work, it was shown that the crack initiation mainly depends on three factors: higher stress distribution, abundant dislocation sources and less resistance to dislocation motion. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 09/07/20 alle ore 19:19:41