An experimental investigation on fatigue crack growth of AL6XN stainless steel

被引：40

作者：

Kalnaus, S. ^{[1
]}

Fan, F. ^{[1
]}

Vasudevan, A. K. ^{[2
]}

Jiang, Y. ^{[1
]}

机构：

[1] Univ Nevada, Dept Mech Engn 312, Reno, NV 89557 USA

[2] Off Naval Res, Arlington, VA 22203 USA

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 08期

关键词：

fatigue crack growth; steel; stress intensity factor;

D O I：

10.1016/j.engfracmech.2007.11.002

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The crack growth behavior of AL6XN stainless steel was experimentally investigated using round compact tension (CT) specimens. The influences of the R-ratio (the ratio of the minimum load over the maximum applied load in a cycle), the tensile and compressive overloads, and the loading sequence on crack growth were studied in detail. The results from the constant-amplitude experiments show a sensitivity of the crack growth rate to the R-ratio. The application of a tensile overload has a profound effect on crack growth, resulting in a significant retardation in the crack propagation rate. A compressive overload (underload) leads to a short-lived acceleration in crack growth. Results from the two-step high-low loading reveal a period of crack growth retardation at the beginning of the lower amplitude step, an effect similar to that of a single overload. A crack driving force parameter together with a modified Wheeler model is found to correlate the crack growth experiments well. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2002 / 2019

页数：18

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