PSI - Issue 31

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 31 (2021) 15–21

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. Abstract The fatigue response of a weight optimise Selective Laser Melted (SLM) Ti-6Al-4V bracket was studied through shaker table testing until fracture. The bracket assembly was tested at its fundamental vibration mode at 84Hz, which was outside of the key excitation frequency (48Hz) of the intended aero-engine application. The study has shown that the SLM bracket has achieved its target inertial capability of ‘20g’ and has been demonstrated to have redundancy in the load path transfer, should a strut fail during engine operation. An analysis of the initial fracture surface suggested that the crack initiation point was the surface breaking internal void acting as a stress raising feature and a point of micro-crack initiation. The results of the shaker table test suggested that the weight optimised SLM bracket has met its performance target. © 2021 The Authors. Published by EL EVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. 4th International Conference on Structural Integrity and Durability, ICSID 2020 Fatigue response of selective laser melted Ti-6Al-4V bracket: an experimental study Alok Gupta a,b , Chris J. Bennett b , Wei Sun b a Rolls Royce plc, Derby, DE24 8BJ, United Kingdom b Gas Turbine and Transmissions Research Centre (G2TRC), Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom Abstract The fatigue response of a weight optimised Selective Laser Melted (SLM) Ti-6Al-4V bracket was studied through shaker table testing until fracture. The bracket assembly was tested at its fundamental vibration mode at 84Hz, which was outside of the key excitation frequency (48Hz) of the intended aero-engine application. The study has shown that the SLM bracket has achieved its target inertial capability of ‘20g’ and has been demonstrated to have redundancy in the load path transfer, should a strut fail during engine operation. An analysis of the initial fracture surface suggested that the crack initiation point was the surface breaking internal void acting as a stress raising feature and a point of micro-crack initiation. The results of the shaker table test suggested that the weight optimised SLM bracket has met its performance target. 4th International Conference on Structural Integrity and Durability, ICSID 2020 Fatigue response of sel ctive laser melted Ti-6Al-4V bracket: an experimental study Alok Gupta a,b , Chris J. Bennett b , Wei Sun b a Rolls Royce plc, Derby, DE24 8BJ, United Kingdom b Gas Turbine and Transmissions Research Centre (G2TRC), Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom

Keywords: Selective Laser Melting; Fatigue; Endurance; Vibration Mode; Fracture.

Keywords: Selective Laser Melting; Fatigue; Endurance; Vibration Mode; Fracture.

Nomenclature  Nomenclature 

Diameter Diameter

* Corresponding author. +44-1332-245674 E-mail address: alok.gupta@rolls-royce.com * Corresponding author. +44-1332-245674 E-mail address: alok.gupta@rolls-royce.com

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers.

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. 10.1016/j.prostr.2021.03.004