Fatigue behaviour of SiCp-reinforced aluminium composites in the very high cycle regime using ultrasonic fatigue

被引：1

作者：

Huang, J.

Spowart, J. E.

Jones, J. W. ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2006年 / 29卷 / 07期

关键词：

critical number density of inclusions; discontinuously reinforced aluminium composite; subsurface crack initiation; ultrasonic fatigue; very high cycle fatigue;

D O I：

10.1111/j.1460-2695.2006.00998.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The fatigue behaviour of a 2009/SiC/15p-T4 DRA composite has been examined in the very high cycle fatigue (VHCF) regime where 10(7) <= N-f <= 10(9) cycles. Ultrasonic fatigue was used to achieve the very high cycle counts. Careful processing yielded a composite with a very homogeneous particle distribution with minimal clustering. Fatigue crack initiation was observed almost exclusively at AlCuFe inclusions with no crack initiation observed at SiC particle clusters. Fatigue lives at a given stress level exhibited minimal scatter and subsurface crack initiation was observed in all cases. This behaviour is consistent with the presence of a low number density of critical inclusions that are responsible for crack initiation very early in fatigue life.

引用

页码：507 / 517

页数：11

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