Fatigue life improvement using low transformation temperature weld material with measurement of residual stress

Franks, Jordan, Wheatley, Greg, Zamani, Pedram, Nejad, Reza Masoudi, Macek, Wojciech, Branco, Ricardo, and Samadi, Farzaneh (2022) Fatigue life improvement using low transformation temperature weld material with measurement of residual stress. International Journal of Fatigue, 164. 107137.

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Abstract

Welding processes often produce high levels of tensile residual stress. Low transformation temperature (LTT) welding wires utilise phase transformation strains to overcome the thermal contraction of a cooling weld. In this paper, the residual stress within each weld was quantified using the milling/strain gauge method, being the strain change measured as the weldment was milled away. The fatigue tests were conducted under uniaxial loading considering two types of LTT materials. The results show that the crack propagation of all samples was similar in cycles although both LTT materials extended the crack initiation, and, therefore, the overall life of the part. It was found that both LTT materials reduced the residual tensile stresses, increased the residual compressive stresses, leading to increase in fatigue life about 30%.

Item ID: 75763
Item Type: Article (Research - C1)
ISSN: 1879-3452
Keywords: Residual stress, Fatigue life, Heat affected zone, Low transformation temperature, Scanning electron microscope
Copyright Information: © 2022 Elsevier Ltd. All rights reserved.
Date Deposited: 17 Aug 2022 09:06
FoR Codes: 40 ENGINEERING > 4001 Aerospace engineering > 400199 Aerospace engineering not elsewhere classified @ 100%
SEO Codes: 27 TRANSPORT > 2701 Aerospace transport > 270199 Aerospace transport not elsewhere classified @ 100%
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