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Title: Comparative fatigue analysis of wrought and laser powder bed fused Ti-6Al-4V for aerospace repairs: academic and industrial insights
Authors: Nagalingam, Arun Prasanth
Gopasetty, Sharan Kumar
Wang, Jingjing
Yuvaraj, Hemanth Kumar
Gopinath, Abhay
Yeo, Swee Hock
Keywords: Engineering::Mechanical engineering
Issue Date: 2023
Source: Nagalingam, A. P., Gopasetty, S. K., Wang, J., Yuvaraj, H. K., Gopinath, A. & Yeo, S. H. (2023). Comparative fatigue analysis of wrought and laser powder bed fused Ti-6Al-4V for aerospace repairs: academic and industrial insights. International Journal of Fatigue, 176, 107879-.
Journal: International Journal of Fatigue
Abstract: Additive manufacturing (AM) holds great promise for delivering benefits in repair of aerospace components. To fully exploit the benefits of AM, it is crucial to demonstrate that AM-produced components satisfy the performance criteria specified by the aerospace industry relative to conventional wrought material. This research assesses the performance of laser-powder bed fused (L-PBF) and wrought Ti-6Al-4V coupons following the aerospace method of manufacture (MoM), which ensures that the material undergoes both surface and sub-surface enhancement to meet fatigue requirements. The results reveal that the aerospace MoM-treated L-PBF Ti-6Al-4V coupons exhibit superior fatigue life compared to their wrought counterparts. Furthermore, it is understood that the vibratory polishing process retains the beneficial compressive residual stress from shot peening, while simultaneously enhancing the surface finish and fatigue life. Finally, a life-cycle cost model assessment highlights that the L-PBF coupons have superior fatigue life and are cost-effective particularly for low-volume repairs, while the use of wrought material is economical for large-volume repair but may compromise fatigue life.
ISSN: 0142-1123
DOI: 10.1016/j.ijfatigue.2023.107879
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Rights: © 2023 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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