Kmax effects on the near-threshold fatigue crack growth of powder-metallurgy aluminum alloys

被引：3

作者：

Newman, John A. ^{[1
]}

Smith, Stephen W. ^{[1
]}

Piascik, Robert S. ^{[2
]}

机构：

[1] NASA, Langley Res Ctr, Durabil Damage Tolerance & Reliabil Branch, Hampton, VA 23681 USA

[2] NASA, Engn & Safety Ctr, Hampton, VA 23681 USA

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2009年 / 31卷 / 8-9期

关键词：

Fatigue crack growth; Threshold; K-max; Fine-grain; Aluminum alloys; Room-temperature creep; AL-MG ALLOY; NANOCRYSTALLINE MATERIALS; DEFORMATION MECHANISM; SUPERPLASTIC BEHAVIOR; COMPUTER-SIMULATION; GRAIN-REFINEMENT; MAGNESIUM ALLOY; CREEP-BEHAVIOR; COPPER BARS; STRAIN-RATE;

D O I：

10.1016/j.ijfatigue.2009.01.002

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue crack growth (FCG) research conducted in the near-threshold regime has identified a room-temperature creep crack growth damage mechanism for a fine-grain powder-metallurgy aluminum alloy (8009). At very low Delta K, an abrupt acceleration in room-temperature FCG rate occurs at high stress ratio and is exacerbated by increased levels of K-max (K-max >= 0.4K(Ic)). Detailed crack-surface analysis correlates accelerated FCG with the formation of crack-tip process zone micro-void damage. Experimental results show that the near-threshold and K-max influenced accelerated crack growth is time and temperature dependent. (C) 2009 Published by Elsevier Ltd.

引用

页码：1237 / 1245

页数：9

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