Three-dimensional crack initiation mechanisms in bcc-Fe under loading modes I, II and III

被引：53

作者：

Vatne, Inga Ringdalen ^{[1
]}

Stukowski, Alexander ^{[2
]}

Thaulow, Christian ^{[1
]}

Ostby, Erling ^{[3
]}

Marian, Jaime ^{[2
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Engn Design & Mat, NO-7491 Trondheim, Norway

[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[3] SINTEF Mat & Chem, NO-7465 Trondheim, Norway

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 560卷

关键词：

Multiscale modeling; Quasicontinuum method; Fe; Dislocation emission; Fracture; Modes I; II and III loading; DUCTILE-BRITTLE BEHAVIOR; QUASI-CONTINUUM METHOD; ATOMISTIC SIMULATION; ALPHA-FE; SCREW DISLOCATIONS; MOLECULAR-DYNAMICS; SINGLE-CRYSTAL; FRACTURE; TIP; TRANSFORMATION;

D O I：

10.1016/j.msea.2012.09.071

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present quasicontinuum simulations of three-dimensional (3D) edge cracks in single crystal bcc-Fe. Crystals with different thicknesses and crystallographic orientations have been investigated and loaded in modes I, II and III. We study incipient plasticity at the crack tip and the onset of crack propagation, and calculate the critical stress intensity factors for crack propagation and dislocation emission. The active slip systems and the character of attendant dislocations have been identified and compared with the standard 2D behavior. We find that the observed type of propagation depends on the loading mode and crystallographic orientation. Mechanisms comprise twinning, bcc -> fcc phase transformation, void formation and dislocation emission. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：306 / 314

页数：9

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