MICROSTRUCTURAL EFFECTS ON THE SMALL FATIGUE CRACK BEHAVIOUR OF AN ALUMINUM ALLOY PLATE
作者:
A. Zabett,
A. Plumtree,
期刊:
Fatigue&Fracture of Engineering Materials&Structures
(WILEY Available online 1995)
卷期:
Volume 18,
issue 7‐8
页码: 801-809
ISSN:8756-758X
年代: 1995
DOI:10.1111/j.1460-2695.1995.tb00905.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
AbstractA study has been conducted on the initiation and growth of fatigue cracks in the three principal directions of an aluminium alloy 2024‐T351 plate tested under stress control (R, minimum to maximum stress =– 1). Early and multiple fatigue crack nucleation from broken Al7Cu2Fe second phase particles resulted in shorter lives for the longitudinal direction specimens in the medium to long life regime. Although fatigue cracks nucleated in large surface grains, rather than at broken particles, the lives of the short‐transverse direction specimens were marginally longer. Cracks also nucleated in large surface grains in the transverse direction specimens, yet the average fatigue lives were about twice as long. This was the consequence of wider slip bands and fewer initial micro
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