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    Experimental Verification of Pulse Shaping in Elastic Metamaterials Under Impact Excitation

    Source: Journal of Vibration and Acoustics:;2022:;volume( 145 ):;issue: 002::page 21009-1
    Author:
    Dorgant, Greg
    ,
    Johnson, William R.
    ,
    DeLima, Washington
    ,
    Leamy, Michael J.
    DOI: 10.1115/1.4056043
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: We present experimental verification of pulse shaping in elastic metamaterials together with a procedure to design, fabricate, and verify metamaterial pulse shapers under impact excitation. The split Hopkinson pressure bar (SHPB) test, a fundamental dynamic test introduced more than 70 years ago, often incorporates pulse shaping as a means to alter a stress wave, providing the primary motivation for the presented study. Elastic metamaterials hold promise for enhancing conventional pulse shaping abilities and improving capabilities of the SHPB test. We first design the pulse shaper by numerically optimizing its response using finite element analysis. The pulse shaper consists of repeated unit cells based on a combination of a phononic crystal and a local resonator. Then, we fabricate and test pulse shaper candidates to validate the procedural efficacy. An iterative element corrects inaccuracies in input force and material properties and allows convergence on an appropriate pulse shaper. We carry out this procedure by designing pulse shapers fabricated from 3D-printed polylactic acid (PLA) to achieve an extended dwell acceleration pulse shape. In experimental impact tests, the procedure results in rise, dwell, and fall behaviors comparable to that predicted, effectively confirming the efficacy of the presented procedure and verifying the performance of metamaterial-based pulse shapers.
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      Experimental Verification of Pulse Shaping in Elastic Metamaterials Under Impact Excitation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4291620
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    contributor authorDorgant, Greg
    contributor authorJohnson, William R.
    contributor authorDeLima, Washington
    contributor authorLeamy, Michael J.
    date accessioned2023-08-16T18:12:31Z
    date available2023-08-16T18:12:31Z
    date copyright11/9/2022 12:00:00 AM
    date issued2022
    identifier issn1048-9002
    identifier othervib_145_2_021009.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4291620
    description abstractWe present experimental verification of pulse shaping in elastic metamaterials together with a procedure to design, fabricate, and verify metamaterial pulse shapers under impact excitation. The split Hopkinson pressure bar (SHPB) test, a fundamental dynamic test introduced more than 70 years ago, often incorporates pulse shaping as a means to alter a stress wave, providing the primary motivation for the presented study. Elastic metamaterials hold promise for enhancing conventional pulse shaping abilities and improving capabilities of the SHPB test. We first design the pulse shaper by numerically optimizing its response using finite element analysis. The pulse shaper consists of repeated unit cells based on a combination of a phononic crystal and a local resonator. Then, we fabricate and test pulse shaper candidates to validate the procedural efficacy. An iterative element corrects inaccuracies in input force and material properties and allows convergence on an appropriate pulse shaper. We carry out this procedure by designing pulse shapers fabricated from 3D-printed polylactic acid (PLA) to achieve an extended dwell acceleration pulse shape. In experimental impact tests, the procedure results in rise, dwell, and fall behaviors comparable to that predicted, effectively confirming the efficacy of the presented procedure and verifying the performance of metamaterial-based pulse shapers.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Verification of Pulse Shaping in Elastic Metamaterials Under Impact Excitation
    typeJournal Paper
    journal volume145
    journal issue2
    journal titleJournal of Vibration and Acoustics
    identifier doi10.1115/1.4056043
    journal fristpage21009-1
    journal lastpage21009-9
    page9
    treeJournal of Vibration and Acoustics:;2022:;volume( 145 ):;issue: 002
    contenttypeFulltext
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