About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Crack Growth and Fatigue-life Predictions for Ti-6Al-4V Fabricated via Laser Directed Energy Deposition |
Author(s) |
Leah Buiter, Aref Yadollahi, James C Newman |
On-Site Speaker (Planned) |
Leah Buiter |
Abstract Scope |
This study examines the fatigue-crack-growth and fatigue-life behavior of Ti-6Al-4V specimens fabricated via laser directed energy deposition (DED-L). The crack-growth-rate data were obtained using standard compact, C(T), specimens and single-edge-notch-bend, SEN(B), specimens. The large-crack growth tests were conducted on C(T) specimens over a wide range of stress ratios and produced crack growth rates from near-threshold to fracture. SEN(B) specimens exhibit crack growth rates comparable to those observed in C(T) specimens in the near-threshold regime. Fatigue tests were conducted on SEN(B) and KT = 1 dogbone specimens under constant-amplitude loading of R = 0.1. A plasticity-induced crack closure model, FASTRAN, was used to predict the fatigue life based on the size of process-induced defects detected by X-ray CT. The estimation of fatigue life, utilizing the ΔKeff-rate curve, exhibited a strong correlation with experimental fatigue test results for both the SEN(B) and KT= 1 specimens. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |