PSI - Issue 75

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia (2025) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 75 (2025) 35–42

© 2025 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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper Abstract Laser Powder Bed Fusion (LPBF) imparts different surface textures depending on part surface orientation. Determining the S-N properties of as-built parts horizontal fatigue samples requires careful consideration of this constraint since these surfaces are involved in fatigue crack initiation in the gauge region. Furthermore, support structures are commonly encountered in horizontal parts which must be removed, where different removal techniques create different surface textures. The influence of these surfaces on S-N performance is investigated via stress-controlled fatigue testing and X-ray Computed Tomography. Horizontal and vertical properties with uniform as-built surfaces are then compared. © 2025 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 the scientific committee of the Fatigue Design 2025 organizers Keywords: Laser powder bed fusion; Support structures; X-ray Computed Tomography, Defects, S-N Curve 1. Introduction Laser Powder Bed Fusion (LPBF) is an Additive Manufacturing (AM) technique that offers superior geometrical accuracy than other AM processes like Directed Energy Deposition (DED) and Wire Arc Additive Manufacturing (WAAM) with respect to the intended design geometry. A key reason for this is its finer surface finishing. Thus, it Fatigue Design 2025 (FatDes 2025) S-N Performance of Horizontally Built LPBF Ti6Al4V Fatigue Samples: Effect of Support Structures and Direction Dependent Surface Textures Ninian Sing Kok Ho a , Zhen Lu b , John Hock Lye Pang a * a School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 b ASTM Asia Pacific Limited, 70 Shenton Way #21-11, Singapore 079118

* Corresponding author. Tel.:+65 9817 5324 E-mail address: mhlpang@ntu.edu.sg

2452-3216 © 2025 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 the scientific committee of the Fatigue Design 2025 organizers

2452-3216 © 2025 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 the responsibility of Dr Fabien Lefebvre with at least 2 reviewers per paper 10.1016/j.prostr.2025.11.005