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Fatigue behaviour of additive manufactured Ti6Al4V, with as-built surfaces, exposed to variable amplitude loading
Linköping University, Department of Management and Engineering. Linköping University, Faculty of Science & Engineering. Saab AB, Aeronaut, SE-58188 Linkoping, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering. Saab AB, Aeronaut, SE-58188 Linkoping, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
2017 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 103, 353-362 p.Article in journal (Refereed) Published
Abstract [en]

Additive Manufacturing (AM) allows for great design freedom compared to conventional manufacturing. This is very attractive for the aerospace industry in which AM could contribute to lightweight designs and thereby reduce fuel consumption, increase payload and extend flight range. The fatigue behaviour for rough as-built AM surfaces has previously been characterized with constant amplitude testing but in aerospace applications, most parts are exposed to variable amplitude loading. The fatigue behaviour for variable amplitude is not always consistent with the behaviour for constant amplitude due to effects of overloads and local plastic deformations. Therefore, variable amplitude loading behaviour of laser sintered and electron beam melted Ti6Al4V, with rough as-built surfaces have been investigated in this study using the Short-FALSTAFF (Fighter Aircraft Loading STAndard For Fatigue) load sequence. The predicted and the experimental fatigue life was overall consistent even though most experimental results exceeded the predicted life, especially for the laser sintered material. These findings show that conventional cumulative damage fatigue life predictions give reliable predictions for AM materials with rough as-built surfaces for the type of tension dominated load sequence used. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2017. Vol. 103, 353-362 p.
Keyword [en]
Additive manufacturing; Ti6Al4V; Fatigue; Variable amplitude loading; Stress concentration
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-140783DOI: 10.1016/j.ijfatigue.2017.06.023ISI: 000407982800034OAI: oai:DiVA.org:liu-140783DiVA: diva2:1140994
Note

Funding Agencies|Saab AB; Swedish Foundation for Strategic Research; European Commission, through the Clean Sky 2 programme

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2017-10-05

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The full text will be freely available from 2019-06-19 15:02
Available from 2019-06-19 15:02

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