Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12166
Title: Physically short and long-crack growth behavior of MIG welded Al-5.8%Mg alloy
Authors: Gaur V.
Enoki M.
Yomogida S.
Published in: Engineering Fracture Mechanics
Abstract: In this study, we investigated the physically short and long-crack growth behavior of Al-5.8%Mg alloy, a special hardened alloy used for welding of Al-5083 plates. Microstructural analysis on both longitudinal and cross-sectional plane of welded plates showed no crystallographic texture with nearly equi-axed grains of size 85 μm and gas porosities. Fatigue tests were done at 50 Hz using CT-specimens at different R-ratios (0.1,0.5 and 0.8) to characterize the long-crack growth behavior. Compliance method was used for crack-closure measurements. An increase in crack growth rates and reduction in threshold ΔK was observed with increasing R-ratio. This R-ratio effect could be rationalized after compensating for crack-closure. Special specimens for short-crack growth fatigue tests were cut from pre-cracked CT-specimens. Constant load-range fatigue tests at 50 Hz were conducted at three different R-ratios (-1,0.1 and 0.5) to characterize the effect of mean-stress on short-crack growth behavior. It appeared that the physically short-cracks initially propagated in closure-free environment and then deviated towards their long-crack growth rates. The microstructural effects on short-cracks were more pronounced at lower mean-stresses or R-ratios. The physically short-crack growth effect could not be removed completely using the crack-closure concept alone, suggesting the role of other growth-retarding mechanisms. A modified empirical model including the effect of other possible growth-retarding mechanisms was proposed to capture the behavior of physically short-cracks in this material. © 2019 Elsevier Ltd
Citation: Engineering Fracture Mechanics (2019), 209(): 301-316
URI: https://doi.org/10.1016/j.engfracmech.2019.01.026
http://repository.iitr.ac.in/handle/123456789/12166
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Aluminum
Crack growth
Fatigue
Mean-stress
Weld
ISSN: 137944
Author Scopus IDs: 56229535200
7004847060
57196470996
Author Affiliations: Gaur, V., Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Enoki, M., Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Yomogida, S., Research & 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, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Japan; email: gaur@rme.mm.t.u-tokyo.ac.jp
Appears in Collections:Journal Publications [ME]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.