Cyclic slip irreversibility and fatigue life: A microstructure-based analysis

被引：102

作者：

Mughrabi, Hael ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Dept Mat Sci & Engn, D-91058 Erlangen, Germany

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 04期

关键词：

Cyclic deformation; Cyclic slip irreversibility; Fatigue damage; Fatigue life; Coffin-Manson fatigue life law; ATOMIC-FORCE MICROSCOPY; SINGLE-CRYSTALS; CRACK INITIATION; ALPHA-IRON; DISLOCATION STRUCTURES; ALLOYS; METALS; DEFORMATION; NICKEL; POLYCRYSTALS;

D O I：

10.1016/j.actamat.2012.10.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The evolution of fatigue damage is intimately related to different types of more or less pronounced irreversible cyclic slip, associated with gradual permanent microstructural and topological changes which ultimately can cause fatigue failure. Only in a few cases has it been possible to assess quantitatively the cyclic slip irreversibility. Based on a limited amount of available experimental data amenable to analysis, an attempt is made in this work to explore whether there exists an explicit relationship between the cyclic slip irreversibility and fatigue life. The existence of such a relationship is suggested by a microstructure-based reformulation of the Coffin-Manson fatigue life law, which involves the cyclic slip irreversibility. The analysis of the experimental data in two adequately documented cases indicates that the cyclic slip irreversibility is related very satisfactorily to fatigue life via a power law which contains two constants. These two constants can be expressed in terms of the fatigue ductility coefficient and the fatigue ductility exponent of the Coffin-Manson fatigue life law. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1197 / 1203

页数：7

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