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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/18092
Title: Fatigue life and crack growth behavior of post welded Aluminum 5183 alloy
Authors: Gaur V.
Enoki M.
Okada T.
Yomogida S.
Henaff G.
Published in: Proceedings of MATEC Web of Conferences
Abstract: In this study we investigated the fatigue life and crack growth behavior of Al-5183 alloy. Microscopic analysis revealed nearly equi-axed grains and no texture in longitudinal or cross-sectional plane of the welded plates. Gas porosities with an average size of 45 μm, comparable to grain size (55 μm), were present and often initiate fatigue failures. Load-controlled cyclic tests at different stress-ratios (R = -1, -0.5, 0.1, 0.5. 0.7 and 0.8) revealed decrease in fatigue lives with increase in R-ratio. At R > 0.7, no fatigue failure could be observed, suggesting a probable mean-stress saturation effect on fatigue. Mean stress also tends to control the crack initiation sites: surface initiated failures at low mean stresses while sub-surface pores induced failures at higher mean stresses. Fatigue-crack growth tests on CT specimens at different R-ratios (0.1, 0.5 and 0.8) revealed reduction in crack growth rates (and in threshold values) with increasing R-ratio. The ΔK applied for pores responsible for fatigue failures were often lower than or near to the threshold values and also, the size of such pores was of order of magnitude of grain size, thus crack initiated from pores are short cracks and further tests are progress. © The Authors, published by EDP Sciences, 2018.
Citation: Proceedings of MATEC Web of Conferences, (2018)
URI: https://doi.org/10.1051/matecconf/201816521013
http://repository.iitr.ac.in/handle/123456789/18092
Issue Date: 2018
Publisher: EDP Sciences
Keywords: Aluminum alloys
Fatigue crack propagation
Fatigue of materials
Grain size and shape
Welded steel structures
Welding
Crack growth behavior
Crack initiation sites
Equi-axed grains
Fatigue failures
Fatigue-crack-growth tests
Microscopic analysis
Saturation effects
Surface-initiated
Cracks
ISSN: 2261236X
Author Scopus IDs: 56229535200
7004847060
57210526304
57196470996
Author Affiliations: Gaur, V., Department of Materials Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Enoki, M., Department of Materials Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Okada, T., Research and Development Division, UACJ Corporation, 3-1-12 Chitose, Minato-ku, Nagoya-city, Aichi Pref., 455-8670, Japan
Yomogida, S., Research and Development Division, UACJ Corporation, 3-1-12 Chitose, Minato-ku, Nagoya-city, Aichi Pref., 455-8670, Japan
Funding Details: The authors are thankful to the Japanese research funding agency (JST) for funding this project through its Cross-ministerial Strategic Innovation Promotion (SIP), “Structural Materials for Innovation†program.
Corresponding Author: Gaur, V.; Department of Materials Engineering, University of Tokyo, 7-3-1 Hongo, Japan; email: gaur@rme.mm.t.u-tokyo.ac.jp
Appears in Collections:Conference Publications [ME]

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