Improved Hybrid Specimen for Vibration Bending Fatigue

Scott‐Emuakpor, Onome; George, Tommy; Holycross, Casey; Cross, Charles

doi:10.1007/978-3-319-42195-7_4

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…The hourglass specimens in this study were designed specifically for the vibration bending testing procedure, with the basic geometry shown in Figure 2A. 26 This sample is a rectangular hourglass-shaped specimen that is 76.2 mm (3 in.) lengthwise, 12.7 mm (0.5 in.)…”

Section: Specimen Geometrymentioning

confidence: 99%

Vibration‐based bending fatigue of additively manufactured alloy 718 with varied surface conditions

Tullis

Eidt

Gockel

et al. 2023

Fatigue Fract Eng Mat Struct

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Surface roughness is a dominating factor in the fatigue failure of structural components. This is especially true in additive manufacturing (AM), wherein as-printed surfaces are particularly rough. This work uses a vibration bending fatigue method, which determines the fatigue life of metals at resonant frequencies. The fatigue behavior of AM nickel superalloy 718 fabricated using laser powder bed fusion is investigated with varying surface conditions, processing parameters, and an internal channel. The results indicate that as-printed surface roughness does not strongly affect vibration bending fatigue life when compared to polished specimens. Fracture surface analysis is performed to determine crack initiation locations, highlighting that most failures initiated from the corners of the rectangular specimens. The outcome of this work is an enhanced understanding of fatigue failure in AM parts with as-printed surfaces, which is an important step in increasing the efficiency and reliability of AM for applications involving fatigue loading conditions.

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Section: Specimen Geometrymentioning

confidence: 99%

Vibration‐based bending fatigue of additively manufactured alloy 718 with varied surface conditions

Tullis

Eidt

Gockel

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

Improved Measurement for High-Cycle Fatigue Examination

Burton

German

Furman

et al. 2019

Conference Proceedings of the Society for Experimental Mechanics Series

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Damage Accumulation in a Novel High-Throughput Technique to Characterize High Cycle Fatigue

Berke

Furman

Holycross

et al. 2021

Journal of Testing and Evaluation

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A multiple-insert carrier plate assembly has been developed to increase the throughput of vibration-based fatigue testing. Typically, in vibration-based fatigue testing, a cantilevered rectangular plate is excited in a high-frequency resonant mode until failure. In this manner, an S-N curve for bending fatigue can be constructed. The concept behind vibration-based fatigue testing has been improved by employing a U-shaped carrier plate and fastening multiple smaller specimens into the channel of the carrier plate, such that fatigue tests can be conducted in tandem. However, because of the presence of a variable stress field over the surface of the assembly, the strain in the specimens is unequal. To account for this unequal strain distribution, a framework is provided for estimating how damage accumulates within each specimen. Using this framework, the efficiency gained by adopting a multi-insert approach is evaluated. By optimizing the strategy with which specimens are replaced as they fail, a throughput 5.49 times greater than sequential testing is shown to be feasible.

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Improved Hybrid Specimen for Vibration Bending Fatigue

Cited by 3 publications

References 13 publications

Vibration‐based bending fatigue of additively manufactured alloy 718 with varied surface conditions

Vibration‐based bending fatigue of additively manufactured alloy 718 with varied surface conditions

Improved Measurement for High-Cycle Fatigue Examination

Damage Accumulation in a Novel High-Throughput Technique to Characterize High Cycle Fatigue

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