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
收藏
页码：1237 / 1245
页数：9
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