About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Characterization of the Fatigue Strength of Additively Manufactured Ti-6Al-4V Specimens with Residual Stress and Recoater Blade Interference Flaws
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Author(s) |
Joshua Mochache, Robert Taylor, Amir Ameri, Jeremy Wilson |
On-Site Speaker (Planned) |
Joshua Mochache |
Abstract Scope |
A study was undertaken to characterize the reduction in fatigue strength of additively manufactured (AM) Ti-6Al-4V specimens built using the University of Texas at Arlington's EOS m290 Laser Powder Bed Fusion (L-PBF) machine with residual stresses and Recoater Blade Interference Flaws (RBIF). The specimens were built per ASTM-E466 and had cylindrical test sections slightly over quarter-inch diameter with as-built surface finishes and no post process heat treatment for residual stress relief. Fatigue strength comparisons based on fatigue test results were presented by S-N and Soderberg plots juxtaposing similarly-built specimens with residual stresses and RBIF against those without RBIF with additional comparisons from other results of similar L-PBF Ti-6Al-4V specimens with heat treatment stress relief and with as-built surface finish versus polished surface finishes. Notional Knock-Down-Factors (KDFs) resulting from the RBIF only comparisons as well as the combination of RBIF and residual stresses to baseline polished and stress-relieved specimens are presented with the aim of providing enhancements in the understanding of worst-case KDFs especially for application in aerospace deterministic structural fatigue and damage tolerance evaluation. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |