SLOW FATIGUE CRACK GROWTH AND THRESHOLD BEHAVIOR IN AIR AND VACUUM OF COMMERCIAL ALUMINUM-ALLOYS

被引：94
作者：
KIRBY, BR
BEEVERS, CJ
机构：
[1] Department of Physical Metallurgy and Materials Science, University of Birmingham, Birmingham, B15 2TT, Edgbaston
来源：
FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES | 1979年 / 1卷 / 02期
关键词：
D O I：
10.1111/j.1460-2695.1979.tb00378.x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Abstract— Fatigue crack growth and threshold behaviour have been examined in three commercial aluminium alloys in both air and vacuum environments. It was observed that, in air, the threshold stress intensity range ΔKt, varied linearly with the ΔKt ratio. In contrast ΔK, in vacuum was found to be independent of R. Over the whole growth rate range examined fatigue crack growth in vacuum was ΔK controlled and failure occurred by a dimple and ductile striation mechanism. This also applied to failure in the intermediate growth rate ranges in air. However, at slow growth rates in air, fatigue crack growth was structure sensitive and crystallographic facets were formed during the crack propagation process. Copyright © 1979, Wiley Blackwell. All rights reserved
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页码：203 / &
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