High cycle fatigue and fatigue crack growth rate in additive manufactured titanium alloys

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dc.contributor.authorZhang, Xiang
dc.contributor.authorSyed, Abdul Khadar
dc.contributor.authorBiswal, Romali
dc.contributor.authorMartina, Filomeno
dc.contributor.authorDing, Jialuo
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2019-07-25T15:37:23Z
dc.date.available2019-07-25T15:37:23Z
dc.date.issued2019-07-03
dc.description.abstractThe Wire + Arc Additive Manufacture (WAAM) process can produce large metal parts in the metre scale, at much higher deposition rate and more efficient material usage compared to the powder bed fusion additive manufacturing (AM) processes. WAAM process also offers lead time reduction and much lower buy-to-fly ratio compared to traditional process methods, e.g. forgings. Research is much needed in the areas of fatigue and fracture performance for qualification and certification of additive manufactured aircraft components. In this study, specimens made of WAAM Ti-6Al-4V alloy were tested and analysed focusing on two key areas of structural integrity and durability: (1) High cycle fatigue and effect of defects: crack initiation at porosity defects was investigated via fatigue and interrupted fatigue-tomography testing performed on specimens with porosity defects purposely embedded in the specimen gauge section. Key findings are as follows. Presence of porosity did not affect the tensile strengths, however both ductility and fatigue strength were significantly reduced. Fatigue life could not be correlated by the applied stress, e.g. in terms of the S-N curves, owing to the different pore sizes. Using the fracture mechanics approach and Murakami’s stress intensity factor equation for pores, good correlation was found between the fatigue life and stress intensity factor range of the crack initiating defects. Predictive methods for fatigue strength reduction were developed taking account of the defect size, location, and distribution. (2) Fatigue crack growth rate: effect of heterogeneous microstructure was investigated via two different material deposition methods and testing two crack orientations. Fatigue crack growth rates were measured for damage tolerance design considerations. Unique microstructure features and their effect on the property anisotropy are discussed.en_UK
dc.identifier.citationZhang X, Syed AK, Biswal R, et al., (2019) High cycle fatigue and fatigue crack growth rate in additive manufactured titanium alloys, In: ICAF 2019 – Structural Integrity in the Age of Additive Manufacturing. Proceedings of the 30th Symposium of the International Committee on Aeronautical Fatigue, June 2-7, 2019, Krakow, Poland. pp. 31-42en_UK
dc.identifier.isbn978-3-030-21502-6
dc.identifier.issn2195-4356
dc.identifier.urihttps://doi.org/10.1007/978-3-030-21503-3_3
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14392
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution-NonCommercial 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectAdditive manufacturingen_UK
dc.subjectPorosity defectsen_UK
dc.subjectFatigue crack initiationen_UK
dc.subjectFatigue crack growth rateen_UK
dc.titleHigh cycle fatigue and fatigue crack growth rate in additive manufactured titanium alloysen_UK
dc.typeConference paperen_UK

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