CONSTANT AMPLITUDE FATIGUE CRACK GROWTH IN ALUMINUM-LITHIUM

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Authors
  1. Zhai, Z.
  2. Morrison, J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
A number of studies of the constant load amplitude fatigue crack growth behaviour of aluminum-lithium alloys have indicated an improvement over conventional alloys. Important contributions to the reduction in crack extension rates include roughness induced crack closure, deviations from the intended crack plane, and non-planar propagation of the crack. All of these effects reduce the effective stress intensity at the crack tip. The anisotropy of mechanical properties and the strong texture found in these alloys, which has been argued to promote inhomogenous plastic deformation and planar slip also results in a variability of crack growth behaviour with the orientation of the fracture plane. The paper describes a detailed study of the orientation dependence of fatigue crack growth in aluminum-lithium plate compared to conventional aerospace alloys. The materials studied were the same 8090, 2090, 2024, and 7075 plates described in paper 13.
Keywords
Al-Li alloys
Report Number
DREP-93-1-PAP-14 — CONTAINED IN DSIS 94-03057
Date of publication
01 Nov 1993
Number of Pages
18
DSTKIM No
94-03043
CANDIS No
141646
Format(s):
Document Image stored on Optical Disk;Originator's fiche received by DSIS

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