Discrete dislocation modelling of near threshold fatigue crack propagation

被引：27

作者：

Pippan, R. ^{[1
,2
]}

Weinhandl, H. ^{[1
]}

机构：

[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria

[2] Christian Doppler Lab Local Anal Deformat & Fract, A-8700 Leoben, Austria

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2010年 / 32卷 / 09期

关键词：

Fatigue threshold; Dislocation; Crack closure; Fatigue crack propagation; SINGLE-CRYSTALS; STAGE-II; GROWTH; TIP; PLASTICITY; CLOSURE; DEFORMATION; SIMULATION; DUCTILE;

D O I：

10.1016/j.ijfatigue.2009.10.001

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

At low crack propagation rate in metals and alloys the discrete nature of plasticity is essential to understand the fatigue phenomena. A short overview of the different types of performed discrete dislocation simulations of cyclically loaded cracks and their essential results are presented. The discrete dislocation mechanics deliver the changes of the stresses and displacement during cyclic loading. However, it does not give directly the crack propagation rate In the simulations one has to assume a propagation mechanism A comparison implies two things. the different simulations, the experimentally observed crack growth behaviour and crystallographic features will be used to show, which crack propagation mechanism is more appropriate in which case (C) 2009 Published by Elsevier Ltd.

引用

页码：1503 / 1510

页数：8

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