About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Ultrasonic Fatigue Investigations for High and Very-High Cycle Fatigue Applications of A356 Cast Aluminum Alloys |
Author(s) |
Hayden G. Furcolo, Anthony G. Spangenberger, Qigui G. Wang, Diana A. Lados |
On-Site Speaker (Planned) |
Hayden G. Furcolo |
Abstract Scope |
Ultrasonic fatigue (USF) testing has the potential to be used for rapid material evaluation in the high and very-high cycle fatigue regimes (105-1010 cycles) by decreasing operational cost and particularly test time. However, materials may exhibit frequency sensitivities, producing discrepancies between fatigue lifetimes measured at conventional and ultrasonic frequencies. Cast aluminum alloy A356Sr-T6 was used to assess these differences and understand if similar underlying physical phenomena are operative. Fatigue testing (R=-1) was conducted at 20 Hz (servo-hydraulic machine) and 20 kHz (USF machine) such that lifetime data are available for both methods in the 105-107 range. Post-test fractographic studies reveal initiating defect size/location and early growth mechanisms for both frequency conditions. Complementary computed tomography scans were conducted to measure pore size/location distributions and make comparisons with fractographic data. The results are presented and discussed in the context of the applicability of USF to the design and qualification of safety-critical components. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Mechanical Properties, Other |