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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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