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Title: The orientation dependence of fatigue-crack growth in 8090 Al-Li plate

Abstract

A series of fatigue-crack growth rate (FCGR) tests was carried out on 8090 Al-Li plate to examine the effects of specimen orientation on fatigue-crack growth. The directionality of fatigue fracture behavior is found to be related to the strong [l brace]110[r brace]<112> texture in this alloy. Based on a previously developed transgranular FCGR model using restricted slip reversibility (RSR) concepts, a mechanistic model is developed for transgranular fatigue-crack growth in highly textured materials. The model takes the form of the Paris relationship with a power law exponent of 3, and the material texture is shown to strongly influence the proportional factor. The effect of texture on FCGR is related through a geometric factor cos[sup 2] [phi], where [phi] defines the angle between the load axis and the normal of the favorable slip plane. The effect of specimen orientation on FCGR in 8090 Al-Li alloy is shown to be related to a combination of its anisotropic mechanical properties and the variation of angle [phi] with specimen orientation. The model further predicts that fatigue-crack growth rates will be slower in many textured materials than texture-free materials because [phi] > 0 and cos[sup 2] [phi] < 1.

Authors:
; ; ;  [1]
  1. (National Research Council of Canada, Ottawa, Ontario (Canada). Structures, Materials and Propulsion Lab.)
Publication Date:
OSTI Identifier:
7072923
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
Additional Journal Information:
Journal Volume: 25:3; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; CRACK PROPAGATION; FATIGUE; LITHIUM ALLOYS; MATHEMATICAL MODELS; MECHANICAL TESTS; ALLOYS; ALUMINIUM ALLOYS; MATERIALS TESTING; MECHANICAL PROPERTIES; TESTING; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Wu, X.J., Wallace, W., Raizenne, M.D., and Koul, A.K. The orientation dependence of fatigue-crack growth in 8090 Al-Li plate. United States: N. p., 1994. Web. doi:10.1007/BF02651599.
Wu, X.J., Wallace, W., Raizenne, M.D., & Koul, A.K. The orientation dependence of fatigue-crack growth in 8090 Al-Li plate. United States. doi:10.1007/BF02651599.
Wu, X.J., Wallace, W., Raizenne, M.D., and Koul, A.K. Tue . "The orientation dependence of fatigue-crack growth in 8090 Al-Li plate". United States. doi:10.1007/BF02651599.
@article{osti_7072923,
title = {The orientation dependence of fatigue-crack growth in 8090 Al-Li plate},
author = {Wu, X.J. and Wallace, W. and Raizenne, M.D. and Koul, A.K.},
abstractNote = {A series of fatigue-crack growth rate (FCGR) tests was carried out on 8090 Al-Li plate to examine the effects of specimen orientation on fatigue-crack growth. The directionality of fatigue fracture behavior is found to be related to the strong [l brace]110[r brace]<112> texture in this alloy. Based on a previously developed transgranular FCGR model using restricted slip reversibility (RSR) concepts, a mechanistic model is developed for transgranular fatigue-crack growth in highly textured materials. The model takes the form of the Paris relationship with a power law exponent of 3, and the material texture is shown to strongly influence the proportional factor. The effect of texture on FCGR is related through a geometric factor cos[sup 2] [phi], where [phi] defines the angle between the load axis and the normal of the favorable slip plane. The effect of specimen orientation on FCGR in 8090 Al-Li alloy is shown to be related to a combination of its anisotropic mechanical properties and the variation of angle [phi] with specimen orientation. The model further predicts that fatigue-crack growth rates will be slower in many textured materials than texture-free materials because [phi] > 0 and cos[sup 2] [phi] < 1.},
doi = {10.1007/BF02651599},
journal = {Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)},
issn = {0360-2133},
number = ,
volume = 25:3,
place = {United States},
year = {1994},
month = {3}
}