{"id":116765,"date":"2022-05-23T22:17:11","date_gmt":"2022-05-23T21:17:11","guid":{"rendered":"https:\/\/material-properties.org\/quest-ce-que-le-coefficient-de-dilatation-thermique-des-materiaux-definition\/"},"modified":"2022-05-24T18:25:49","modified_gmt":"2022-05-24T17:25:49","slug":"quest-ce-que-le-coefficient-de-dilatation-thermique-des-materiaux-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quest-ce-que-le-coefficient-de-dilatation-thermique-des-materiaux-definition\/","title":{"rendered":"Qu&rsquo;est-ce que le coefficient de dilatation thermique des mat\u00e9riaux &#8211; D\u00e9finition"},"content":{"rendered":"<p><span><div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">Un coefficient de dilatation lin\u00e9aire est g\u00e9n\u00e9ralement utilis\u00e9 pour d\u00e9crire la dilatation d&rsquo;un solide, tandis qu&rsquo;un coefficient de dilatation volumique est plus utile pour un liquide ou un gaz.\u00a0Coefficient de dilatation thermique des mat\u00e9riaux<\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><strong><span>Les propri\u00e9t\u00e9s thermiques<\/span><\/strong><span> des mat\u00e9riaux font r\u00e9f\u00e9rence \u00e0 la r\u00e9ponse des mat\u00e9riaux aux changements de leur <\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/<a href=\"https:\/\/modern-physics.org\/thermodynamics\/\">thermodynamics<\/a>\/thermodynamic-properties\/what-is-temperature-physics\/\u00a0\u00bb><span>temp\u00e9rature<\/span><span>\u00a0et \u00e0 l&rsquo;application de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-in-physics-definition-of-heat\/\"><span>chaleur<\/span><\/a><span>.\u00a0Lorsqu&rsquo;un solide absorbe de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/<a href=\"https:\/\/modern-physics.org\/thermodynamics\/\">thermodynamics<\/a>\/what-is-energy-physics\/\u00a0\u00bb><span>l&rsquo;\u00e9nergie<\/span><span>\u00a0sous forme de chaleur, sa temp\u00e9rature augmente et ses dimensions augmentent.\u00a0Mais\u00a0<\/span><strong><span>diff\u00e9rents mat\u00e9riaux r\u00e9agissent diff\u00e9remment\u00a0<\/span><\/strong><strong><span>\u00e0<\/span><\/strong><span> l&rsquo;application de chaleur.<\/span><\/p>\n<p><span>La capacit\u00e9 calorifique, la dilatation thermique et la conductivit\u00e9 thermique sont des propri\u00e9t\u00e9s qui sont souvent critiques dans l&rsquo;utilisation pratique des solides.<\/span><\/p>\n<h2><span>Coefficient de dilatation thermique des mat\u00e9riaux<\/span><\/h2>\n<p><a href=\"https:\/\/material-properties.org\/thermal-expansion-coefficient-of-chemical-elements\/\"><strong><span>La dilatation thermique<\/span><\/strong><\/a><span> est g\u00e9n\u00e9ralement la tendance de la<\/span><a href=\"https:\/\/material-properties.org\/what-is-matter-definition\/\"><span>\u00a0mati\u00e8re<\/span><\/a><span>\u00a0\u00e0 changer ses dimensions en r\u00e9ponse \u00e0 un changement de temp\u00e9rature.\u00a0Il est g\u00e9n\u00e9ralement exprim\u00e9 sous la forme d&rsquo;un changement fractionnaire de longueur ou de volume par unit\u00e9 de changement de temp\u00e9rature.\u00a0La dilatation thermique est courante pour les solides, les liquides et les gaz.\u00a0Contrairement aux gaz ou aux liquides, les mat\u00e9riaux solides ont tendance \u00e0 conserver leur forme lorsqu&rsquo;ils subissent une dilatation thermique.\u00a0Un <\/span><strong><span>coefficient de dilatation lin\u00e9aire<\/span><\/strong><span> est g\u00e9n\u00e9ralement utilis\u00e9 pour d\u00e9crire la dilatation d&rsquo;un solide, tandis qu&rsquo;un coefficient de dilatation volumique est plus utile pour un liquide ou un gaz.<\/span><\/p>\n<p><span>Le <\/span><strong><span>coefficient de dilatation thermique lin\u00e9aire<\/span><\/strong><span> est d\u00e9fini comme suit:<\/span><\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/linear-thermal-expansion-coefficient-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-28144\" src=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/linear-thermal-expansion-coefficient-equation.png\" alt=\"coefficient de dilatation thermique lin\u00e9aire - \u00e9quation\" width=\"124\" height=\"73\" \/><\/a><\/p>\n<p><span>o\u00f9 <\/span><em><span>L<\/span><\/em><span>\u00a0est une mesure de longueur particuli\u00e8re et\u00a0<\/span><em><span>dL\/dT<\/span><\/em><span> est le taux de changement de cette dimension lin\u00e9aire par unit\u00e9 de changement de temp\u00e9rature.<\/span><\/p>\n<p><span>Le coefficient de dilatation thermique volum\u00e9trique est le coefficient de dilatation thermique le plus \u00e9l\u00e9mentaire et le plus pertinent pour les fluides.\u00a0En g\u00e9n\u00e9ral, les substances se dilatent ou se contractent lorsque leur temp\u00e9rature change, la dilatation ou la contraction se produisant dans toutes les directions.<\/span><\/p>\n<p><span>Le <\/span><strong><span>coefficient de dilatation thermique volum\u00e9trique<\/span><\/strong><span> est d\u00e9fini comme suit:<\/span><\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/volumetric-thermal-expansion-coefficient-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-28146\" src=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/volumetric-thermal-expansion-coefficient-equation.png\" alt=\"coefficient de dilatation thermique volum\u00e9trique - \u00e9quation\" width=\"130\" height=\"77\" \/><\/a><\/p>\n<p><span>o\u00f9 <\/span><em><span>L<\/span><\/em><span> est le volume du mat\u00e9riau et <\/span><em><span>dV\/dT<\/span><\/em><span> est le taux de variation de ce volume par unit\u00e9 de changement de temp\u00e9rature.<\/span><\/p>\n<p><span>Dans un solide ou un liquide, il existe un \u00e9quilibre dynamique entre les forces de coh\u00e9sion qui maintiennent les atomes ou les mol\u00e9cules ensemble et les conditions cr\u00e9\u00e9es par la temp\u00e9rature.\u00a0Par cons\u00e9quent, des temp\u00e9ratures plus \u00e9lev\u00e9es impliquent <\/span><strong><span>une plus grande distance<\/span><\/strong><span>\u00a0entre les atomes.\u00a0Diff\u00e9rents mat\u00e9riaux ont des forces de liaison diff\u00e9rentes et donc des coefficients de dilatation diff\u00e9rents.\u00a0Si un solide cristallin est isom\u00e9trique (a la m\u00eame configuration structurelle partout), l&rsquo;expansion sera uniforme dans toutes les dimensions du cristal.\u00a0Pour ces mat\u00e9riaux, la surface et le coefficient de dilatation thermique volum\u00e9trique sont, respectivement, environ deux fois et trois fois plus grands que le coefficient de dilatation thermique lin\u00e9aire (<\/span><strong><span>\u03b1<\/span><sub><span>V<\/span><\/sub><span> = 3\u03b1<\/span><sub><span>L<\/span><\/sub><\/strong><span>).\u00a0S&rsquo;il n&rsquo;est pas isom\u00e9trique, il peut y avoir diff\u00e9rents coefficients de dilatation pour diff\u00e9rentes directions cristallographiques, et le cristal changera de forme \u00e0 mesure que la temp\u00e9rature change.<\/span><\/p>\n<p><span><\/span><\/p><\/div><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span><div class=\"su-accordion su-u-trim\"><div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>References :<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\u00a0<\/div><\/div><\/div><\/span><strong><span>Science des mat\u00e9riaux:<\/span><\/strong><\/p>\n<ol>\n<li><span>D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 1 et 2. Janvier 1993.<\/span><\/li>\n<li><span>D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 2 et 2. Janvier 1993.<\/span><\/li>\n<li><span>William D. Callister, David G. Rethwisch.\u00a0Science et g\u00e9nie des mat\u00e9riaux : une introduction 9e \u00e9dition, Wiley ;\u00a09 \u00e9dition (4 d\u00e9cembre 2013), ISBN-13\u00a0: 978-1118324578.<\/span><\/li>\n<li><span>En ligneEberhart, Mark (2003).\u00a0Pourquoi les choses se cassent\u00a0: Comprendre le monde par la mani\u00e8re dont il se d\u00e9compose.\u00a0Harmonie.\u00a0ISBN 978-1-4000-4760-4.<\/span><\/li>\n<li><span>Gaskell, David R. (1995).\u00a0Introduction \u00e0 la thermodynamique des mat\u00e9riaux (4e \u00e9d.).\u00a0\u00c9ditions Taylor et Francis.\u00a0ISBN 978-1-56032-992-3.<\/span><\/li>\n<li><span>Gonzalez-Vi\u00f1as, W. &amp; Mancini, HL (2004).\u00a0Une introduction \u00e0 la science des mat\u00e9riaux.\u00a0Presse universitaire de Princeton.\u00a0ISBN 978-0-691-07097-1<\/span><\/li>\n<li><span>Ashby, Michael;\u00a0Hugh Shercliff;\u00a0David Cebon (2007).\u00a0Mat\u00e9riaux: ing\u00e9nierie, science, traitement et conception (1\u00e8re \u00e9d.).\u00a0Butterworth-Heinemann.\u00a0ISBN 978-0-7506-8391-3.<\/span><\/li>\n<li><span>JR Lamarsh, AJ Baratta, Introduction au g\u00e9nie nucl\u00e9aire, 3e \u00e9d., Prentice-Hall, 2001, ISBN : 0-201-82498-1.<\/span><\/li>\n<\/ol>\n<p><span><\/span><\/p><\/div><\/div><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div class=\"su-divider su-divider-style-default\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h2><span>Voir au dessus:<\/span><\/h2>\n<p><span>Propri\u00e9t\u00e9s thermiques<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/thermal-properties-of-materials\/\" class=\"su-button su-button-style-flat\" style=\"color:#606060;background-color:#ffffff ;border-color:#ffffff ;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px\" target=\"_self\"><span style=\"color:#606060;padding:7px 20px;font-size:16px;line-height:24px;border-color:#ffffff ;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;text-shadow:0px 0px 0px #000000;-moz-text-shadow:0px 0px 0px #000000;-webkit-text-shadow:0px 0px 0px #000000\"><img src=\"icon : lien\" alt=\"\" style=\"width:24px;height:24px\" \/> <\/span><\/a><\/span><\/p><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span>Nous esp\u00e9rons que cet article,\u00a0<\/span><strong><span>Coefficient de dilatation thermique des mat\u00e9riaux<\/span><\/strong><span>, vous aidera.\u00a0Si oui,\u00a0<\/span><strong><span>donnez-nous un like<\/span><\/strong><span>\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nous esp\u00e9rons que cet article,\u00a0Coefficient de dilatation thermique des mat\u00e9riaux, vous aidera.\u00a0Si oui,\u00a0donnez-nous un like\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que le coefficient de dilatation thermique des mat\u00e9riaux - D\u00e9finition | Propri\u00e9t\u00e9s mat\u00e9rielles<\/title>\n<meta name=\"description\" content=\"Un\u00a0coefficient de dilatation lin\u00e9aire\u00a0est g\u00e9n\u00e9ralement utilis\u00e9 pour d\u00e9crire la dilatation d&#039;un solide, tandis qu&#039;un coefficient de dilatation volumique est plus utile pour un liquide ou un gaz. 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Coefficient de dilatation thermique des mat\u00e9riaux","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/material-properties.org\/fr\/quest-ce-que-le-coefficient-de-dilatation-thermique-des-materiaux-definition\/","og_locale":"fr_FR","og_type":"article","og_title":"Qu'est-ce que le coefficient de dilatation thermique des mat\u00e9riaux - D\u00e9finition | Propri\u00e9t\u00e9s mat\u00e9rielles","og_description":"Un\u00a0coefficient de dilatation lin\u00e9aire\u00a0est g\u00e9n\u00e9ralement utilis\u00e9 pour d\u00e9crire la dilatation d'un solide, tandis qu'un coefficient de dilatation volumique est plus utile pour un liquide ou un gaz. 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