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    Investigation of Self-Heating During Ultrasonic Fatigue Testing and Effect on Very High Cycle Fatigue Behavior of Titanium 6Al-4V

    Source: Journal of Engineering for Gas Turbines and Power:;2022:;volume( 145 ):;issue: 003::page 31016-1
    Author:
    Celli, Dino A.
    ,
    Scott-Emuakpor, Onome
    ,
    Warner, Justin
    ,
    George, Tommy
    DOI: 10.1115/1.4055726
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Very high cycle fatigue (VHCF) data and experiments, 107–109 cycles to failure, have traditionally been both a cumbersome and costly task to perform. However, characterizing VHCF behavior of material systems is critical for the design and sustainability of turbine engines as outlined in the turbine engine structural integrity program (ENSIP). With recent advancements, ultrasonic fatigue (UF) test systems have become increasingly available to generate VHCF fatigue data. A primary consideration for ultrasonic fatigue testing is the frequency of loading, the resulting thermal evolution, and its effect on fatigue life. To mitigate the heat generation within the specimen during experiments, cooling air is directed to the specimen and cyclic loading is performed by selecting an appropriate test frequency or defining a duty cycle rather than continuously subjected to fatigue. However, standardization of experimental test procedures remains ongoing and continues to be developed. In this study, a Shimadzu USF-1000A ultrasonic fatigue test system is used to characterize VHCF behavior of Ti-6Al-4V to understand the effect of duty cycle and thermal evolution on fatigue life for ultrasonic fatigue testing. Titanium 6Al-4V test specimens are subjected to fully reversed axial fatigue at 20 kHz exciting resonance in an axial mode to better characterize the experimental process. Three duty cycle-cooling air configurations and their effect on fatigue life due to self-generated heat during the experiment are investigated. Heat generation is monitored in situ via a single-point optical pyrometer, and in situ mechanical and thermal data are collected and compared to standardized servohydraulic fatigue test data performed in this study as well as from data found in the literature.
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      Investigation of Self-Heating During Ultrasonic Fatigue Testing and Effect on Very High Cycle Fatigue Behavior of Titanium 6Al-4V

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4291844
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    contributor authorCelli, Dino A.
    contributor authorScott-Emuakpor, Onome
    contributor authorWarner, Justin
    contributor authorGeorge, Tommy
    date accessioned2023-08-16T18:20:47Z
    date available2023-08-16T18:20:47Z
    date copyright12/5/2022 12:00:00 AM
    date issued2022
    identifier issn0742-4795
    identifier othergtp_145_03_031016.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4291844
    description abstractVery high cycle fatigue (VHCF) data and experiments, 107–109 cycles to failure, have traditionally been both a cumbersome and costly task to perform. However, characterizing VHCF behavior of material systems is critical for the design and sustainability of turbine engines as outlined in the turbine engine structural integrity program (ENSIP). With recent advancements, ultrasonic fatigue (UF) test systems have become increasingly available to generate VHCF fatigue data. A primary consideration for ultrasonic fatigue testing is the frequency of loading, the resulting thermal evolution, and its effect on fatigue life. To mitigate the heat generation within the specimen during experiments, cooling air is directed to the specimen and cyclic loading is performed by selecting an appropriate test frequency or defining a duty cycle rather than continuously subjected to fatigue. However, standardization of experimental test procedures remains ongoing and continues to be developed. In this study, a Shimadzu USF-1000A ultrasonic fatigue test system is used to characterize VHCF behavior of Ti-6Al-4V to understand the effect of duty cycle and thermal evolution on fatigue life for ultrasonic fatigue testing. Titanium 6Al-4V test specimens are subjected to fully reversed axial fatigue at 20 kHz exciting resonance in an axial mode to better characterize the experimental process. Three duty cycle-cooling air configurations and their effect on fatigue life due to self-generated heat during the experiment are investigated. Heat generation is monitored in situ via a single-point optical pyrometer, and in situ mechanical and thermal data are collected and compared to standardized servohydraulic fatigue test data performed in this study as well as from data found in the literature.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInvestigation of Self-Heating During Ultrasonic Fatigue Testing and Effect on Very High Cycle Fatigue Behavior of Titanium 6Al-4V
    typeJournal Paper
    journal volume145
    journal issue3
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4055726
    journal fristpage31016-1
    journal lastpage31016-6
    page6
    treeJournal of Engineering for Gas Turbines and Power:;2022:;volume( 145 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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