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    Stress Whitening Quantification of Thermoformed Mineral Filled Acrylics

    Source: Journal of Engineering Materials and Technology:;2010:;volume( 132 ):;issue: 003::page 31002
    Author:
    E. M. Gunel
    ,
    C. Basaran
    DOI: 10.1115/1.4001262
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Stress whitening problem in thermoformed alumina trihydrate (ATH) reinforced poly(methyl methacrylate) (PMMA) was studied. In situ heavy-gage thermoforming of acrylics was entirely replicated under laboratory controlled conditions at different operation parameters. Samples were monitored with optical microscope after the completion of the thermoforming operation. For stress whitening quantification, a new index was proposed from image histograms of processed optical micrographs. Results indicated that stress whitening in PMMA/ATH samples increases with level of plastic deformation at all thermoforming conditions. The influence of the forming rate and forming temperature on the degree of stress whitening was explained in terms of change in material behavior and microdeformation mechanisms around two characteristic temperatures of PMMA/ATH. Developed method for stress whitening quantification characterizes different levels of stress whitening with single numeric values. It is shown that stress whitening index and density of microdeformation features display a strong correlation. Higher density of particle cracks at low forming temperatures results in higher stress whitening levels. Increased surface irregularity and large size voids at high forming temperatures produce lower stress whitening.
    keyword(s): Temperature , Stress , Cycles , Deformation AND Particulate matter ,
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      Stress Whitening Quantification of Thermoformed Mineral Filled Acrylics

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    http://yetl.yabesh.ir/yetl1/handle/yetl/143328
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    contributor authorE. M. Gunel
    contributor authorC. Basaran
    date accessioned2017-05-09T00:37:56Z
    date available2017-05-09T00:37:56Z
    date copyrightJuly, 2010
    date issued2010
    identifier issn0094-4289
    identifier otherJEMTA8-27130#031002_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/143328
    description abstractStress whitening problem in thermoformed alumina trihydrate (ATH) reinforced poly(methyl methacrylate) (PMMA) was studied. In situ heavy-gage thermoforming of acrylics was entirely replicated under laboratory controlled conditions at different operation parameters. Samples were monitored with optical microscope after the completion of the thermoforming operation. For stress whitening quantification, a new index was proposed from image histograms of processed optical micrographs. Results indicated that stress whitening in PMMA/ATH samples increases with level of plastic deformation at all thermoforming conditions. The influence of the forming rate and forming temperature on the degree of stress whitening was explained in terms of change in material behavior and microdeformation mechanisms around two characteristic temperatures of PMMA/ATH. Developed method for stress whitening quantification characterizes different levels of stress whitening with single numeric values. It is shown that stress whitening index and density of microdeformation features display a strong correlation. Higher density of particle cracks at low forming temperatures results in higher stress whitening levels. Increased surface irregularity and large size voids at high forming temperatures produce lower stress whitening.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleStress Whitening Quantification of Thermoformed Mineral Filled Acrylics
    typeJournal Paper
    journal volume132
    journal issue3
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.4001262
    journal fristpage31002
    identifier eissn1528-8889
    keywordsTemperature
    keywordsStress
    keywordsCycles
    keywordsDeformation AND Particulate matter
    treeJournal of Engineering Materials and Technology:;2010:;volume( 132 ):;issue: 003
    contenttypeFulltext
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