Thermoelastic Properties of Materials with Negative Coefficients of Thermal Expansion
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Thermoelastic damping
Negative Thermal Expansion
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Expansion Properties of Plastic MaterialsR. F. Clash Jr. and L. M. RynkiewiczCite this: Ind. Eng. Chem. 1944, 36, 3, 279–282Publication Date (Print):March 1, 1944Publication History Published online1 May 2002Published inissue 1 March 1944https://pubs.acs.org/doi/10.1021/ie50411a021https://doi.org/10.1021/ie50411a021research-articleACS PublicationsRequest reuse permissionsArticle Views316Altmetric-Citations39LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
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The effect of a complex coefficient of thermal expansion upon the thermoelastic relaxation mechanism is analyzed.A phase angle in the thermal expansion has the effect of generating a very broad band of mechanical damping, in addition to the peak usually observed.Phase angles in the thermal expansion have been observed in several polymers, and they may be generated in composite materials in which one or more phases is viscoelastic.However the resulting enhancement of the overall damping of the composite is modest, unless new materials can be found with very high relaxation strength or with a large intrinsic phase angle in the expansion.1.
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We design three-phase composites having maximum thermal expansion, zero thermal expansion, or negative thermal expansion using a numerical topology optimization method. It is shown that composites with effective negative thermal expansion can be obtained by mixing two phases of positive thermal expansions with a void phase. We also show that there is no mechanistic relationship between negative thermal expansion and negative Poisson’s ratio.
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