FRACTOGRAPHIC EXAMINATION OF FATIGUE CRACK GROWTH IN ALUMINUM-LITHIUM ALLOYS

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Authors
  1. Hull, D.A.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Engineering Material Research, Downsview ONT (CAN)
Abstract
The Defence Research Establishment Pacific (DREP) has investigated the effect of Aluminum-Lithium 8090-T8771 and 2090-T8E41 plate orientation on constant amplitude fatigue crack growth rate (FCGR). The report describes a follow-on study of the broken compact specimens. Metallographic observations and texture analysis were first carried out on selected samples in order to obtain background information on the alloys. The fracture surfaces of the DREP specimens were then inspected scanning electron microscopy to identify mechanisms of fatigue crack growth that would aid in the understanding of the constant amplitude FCGR data. Fracture features at known crack lengths were correlated with specific rates of fatigue crack growth.
Keywords
8090 Al-Li ALLOYS;2090 Al-Li ALLOYS
Report Number
DREP-CR-94-57 — Contractor Report
Date of publication
01 Mar 1994
Number of Pages
102
DSTKIM No
94-06250
CANDIS No
145408
Format(s):
Hardcopy;Document Image stored on Optical Disk

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