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    Strain Accumulation in Polymer Electrolyte Membrane and Membrane Electrode Assembly Materials During a Single Hydration/Dehydration Cycle

    Source: Journal of Fuel Cell Science and Technology:;2007:;volume( 004 ):;issue: 001::page 19
    Author:
    Louis G. Hector
    ,
    Yeh-Hung Lai
    ,
    Wei Tong
    ,
    Michael J. Lukitsch
    DOI: 10.1115/1.2393302
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A digital image correlation technique was used to measure drying-induced strains in perfluorosulfonic acid (PFSA) membrane and membrane electrode assembly (MEA) materials which are key components of fuel cells. Circular coupons of each material were constrained in a stainless-steel drum fixture and hydration was achieved by immersing the drum/coupon assembly in 80°C water for 5min. During air drying at 25°C and 50% relative humidity, a series of 1280×960 digital images of each coupon surface was recorded with a digital camera and image acquisition system for drying periods up to 26h. Cumulative correlation of an initial image recorded prior to hot water immersion and the final image at the end of drying produced in-plane strain contour maps. Incremental correlation was employed to track strain evolution at the coupon centers and at peripheral points. During the earliest drying stages, where both materials exhibited viscoelastic behavior, peak radial strains of 9.50% and 2.50% were measured in the PFSA membrane and MEA materials, respectively. At longer drying times, peak radial strains reached constant values of 5.70% and 1.25% in the PFSA membrane and MEA materials, respectively. Strain accumulation in the MEA tends to be less uniform than that in the membrane, and corresponding peak strain values in the MEA tend to be less than those in the membrane independent of drying duration. Reinforcement from the electrode layers lowers strain accumulation in the MEA, but it does not preclude crack nucleation in these layers as drying proceeds.
    keyword(s): Drying , Manufacturing , Electrodes , Membranes , Proton exchange membranes , Jigs and fixtures AND Cycles ,
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      Strain Accumulation in Polymer Electrolyte Membrane and Membrane Electrode Assembly Materials During a Single Hydration/Dehydration Cycle

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/136139
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    contributor authorLouis G. Hector
    contributor authorYeh-Hung Lai
    contributor authorWei Tong
    contributor authorMichael J. Lukitsch
    date accessioned2017-05-09T00:24:27Z
    date available2017-05-09T00:24:27Z
    date copyrightFebruary, 2007
    date issued2007
    identifier issn2381-6872
    identifier otherJFCSAU-28928#19_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/136139
    description abstractA digital image correlation technique was used to measure drying-induced strains in perfluorosulfonic acid (PFSA) membrane and membrane electrode assembly (MEA) materials which are key components of fuel cells. Circular coupons of each material were constrained in a stainless-steel drum fixture and hydration was achieved by immersing the drum/coupon assembly in 80°C water for 5min. During air drying at 25°C and 50% relative humidity, a series of 1280×960 digital images of each coupon surface was recorded with a digital camera and image acquisition system for drying periods up to 26h. Cumulative correlation of an initial image recorded prior to hot water immersion and the final image at the end of drying produced in-plane strain contour maps. Incremental correlation was employed to track strain evolution at the coupon centers and at peripheral points. During the earliest drying stages, where both materials exhibited viscoelastic behavior, peak radial strains of 9.50% and 2.50% were measured in the PFSA membrane and MEA materials, respectively. At longer drying times, peak radial strains reached constant values of 5.70% and 1.25% in the PFSA membrane and MEA materials, respectively. Strain accumulation in the MEA tends to be less uniform than that in the membrane, and corresponding peak strain values in the MEA tend to be less than those in the membrane independent of drying duration. Reinforcement from the electrode layers lowers strain accumulation in the MEA, but it does not preclude crack nucleation in these layers as drying proceeds.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleStrain Accumulation in Polymer Electrolyte Membrane and Membrane Electrode Assembly Materials During a Single Hydration/Dehydration Cycle
    typeJournal Paper
    journal volume4
    journal issue1
    journal titleJournal of Fuel Cell Science and Technology
    identifier doi10.1115/1.2393302
    journal fristpage19
    journal lastpage28
    identifier eissn2381-6910
    keywordsDrying
    keywordsManufacturing
    keywordsElectrodes
    keywordsMembranes
    keywordsProton exchange membranes
    keywordsJigs and fixtures AND Cycles
    treeJournal of Fuel Cell Science and Technology:;2007:;volume( 004 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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