{"id":116839,"date":"2022-05-24T19:36:00","date_gmt":"2022-05-24T18:36:00","guid":{"rendered":"https:\/\/material-properties.org\/quest-ce-que-la-loi-de-hooke-definition\/"},"modified":"2022-05-25T13:40:33","modified_gmt":"2022-05-25T12:40:33","slug":"quest-ce-que-la-loi-de-hooke-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quest-ce-que-la-loi-de-hooke-definition\/","title":{"rendered":"Qu&rsquo;est-ce que la loi de Hooke &#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\">La loi de Hooke d\u00e9crit le comportement d&rsquo;une barre dans le domaine \u00e9lastique.\u00a0Dans cette r\u00e9gion, l&rsquo;allongement de la barre est directement proportionnel \u00e0 la force de traction.<\/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><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-stress-strain-curve.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright wp-image-27801\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-stress-strain-curve.png\" alt=\"la loi de Hooke\" width=\"471\" height=\"434\" \/><\/a><span>La plupart des mat\u00e9riaux polycristallins ont dans leur plage \u00e9lastique une relation presque constante entre la contrainte et la d\u00e9formation.\u00a0En 1678, un scientifique anglais du nom de\u00a0<\/span><strong><span>Robert Hooke<\/span><\/strong><span>\u00a0a men\u00e9 des exp\u00e9riences qui ont fourni des donn\u00e9es montrant que dans la plage \u00e9lastique d&rsquo;un mat\u00e9riau,\u00a0<\/span><b><span>la d\u00e9formation est proportionnelle \u00e0 la contrainte<\/span><\/b><span>.\u00a0Robert Hooke a conclu que la force F dans n&rsquo;importe quel ressort est proportionnelle \u00e0 l&rsquo;extension (la d\u00e9formation \u00e0 partir de l&rsquo;\u00e9tat d\u00e9tendu) x comme suit:<\/span><\/p>\n<p><strong><span>F = k\u00b7x<\/span><\/strong><\/p>\n<p><span>o\u00f9 le terme\u00a0<\/span><strong><span>k<\/span><\/strong><span>\u00a0est la\u00a0<\/span><strong><span>raideur<\/span><\/strong><span>\u00a0du ressort et x est petit par rapport \u00e0 la d\u00e9formation totale possible du ressort.\u00a0Il doit \u00e9ventuellement \u00e9chouer une fois que les forces d\u00e9passent une certaine limite, car aucun mat\u00e9riau ne peut \u00eatre comprim\u00e9 au-del\u00e0 d&rsquo;une certaine taille minimale, ou \u00e9tir\u00e9 au-del\u00e0 d&rsquo;une taille maximale, sans d\u00e9formation permanente ou changement d&rsquo;\u00e9tat.<\/span><\/p>\n<p><span>En cas de contrainte de traction d&rsquo;une barre uniforme (courbe contrainte-d\u00e9formation), la\u00a0<\/span><b><span>loi de Hooke<\/span><\/b><span>\u00a0d\u00e9crit le comportement d&rsquo;une barre dans la r\u00e9gion \u00e9lastique.\u00a0Dans cette r\u00e9gion, l&rsquo;allongement de la barre est directement proportionnel \u00e0 la force de traction et \u00e0 la longueur de la barre et inversement proportionnel \u00e0 la section transversale et au\u00a0<\/span><b><span>module d&rsquo;\u00e9lasticit\u00e9<\/span><\/b><span>.\u00a0Jusqu&rsquo;\u00e0 une contrainte limite, une caisse pourra retrouver ses dimensions au retrait de la charge.\u00a0Les contraintes appliqu\u00e9es font que les atomes d&rsquo;un cristal se d\u00e9placent de leur position d&rsquo;\u00e9quilibre.\u00a0Tous les atomes sont d\u00e9plac\u00e9s de la m\u00eame quantit\u00e9 et conservent toujours leur g\u00e9om\u00e9trie relative.\u00a0Lorsque les contraintes sont supprim\u00e9es, tous les atomes reviennent \u00e0 leur position d&rsquo;origine et aucune d\u00e9formation permanente ne se produit.\u00a0Selon la\u00a0<\/span><b><span>loi de Hooke, <\/span><\/b><span>la contrainte est proportionnelle \u00e0 la d\u00e9formation (dans la r\u00e9gion \u00e9lastique) et la pente est\u00a0<\/span><b><span>le module de Young<\/span><\/b><span>.<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-27811\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-equation.png\" alt=\"\" width=\"320\" height=\"164\" \/><\/a><span>Nous pouvons \u00e9tendre la m\u00eame id\u00e9e de relier la contrainte \u00e0 la d\u00e9formation aux applications de cisaillement dans la r\u00e9gion lin\u00e9aire, en reliant la contrainte de cisaillement \u00e0 la d\u00e9formation de cisaillement pour cr\u00e9er\u00a0<\/span><b><span>la loi de Hooke pour la contrainte de cisaillement<\/span><\/b><span>:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hooke\u2019s-law-for-shear-stress.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-27830\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hooke\u2019s-law-for-shear-stress.png\" alt=\"Loi de Hooke pour la contrainte de cisaillement\" width=\"248\" height=\"136\" \/><\/a><\/p>\n<p><span>Pour les mat\u00e9riaux isotropes dans la r\u00e9gion \u00e9lastique, vous pouvez relier le coefficient de Poisson (\u03bd), le module d&rsquo;\u00e9lasticit\u00e9 de Young (E) et le module d&rsquo;\u00e9lasticit\u00e9 de cisaillement (G):<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hooke\u2019s-law-poissons-ratio.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-27829\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hooke\u2019s-law-poissons-ratio.png\" alt=\"Loi de Hooke - rapport poissons\" width=\"270\" height=\"134\" \/><\/a><\/p>\n<p><span>Les modules \u00e9lastiques propres aux mat\u00e9riaux polycristallins:<\/span><\/p>\n<ul>\n<li><b><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Youngs-Modulus-of-Elasticity-Table-of-Materials.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-full wp-image-27806\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Youngs-Modulus-of-Elasticity-Table-of-Materials.png\" alt=\"Module d'\u00e9lasticit\u00e9 de Young - Tableau des mat\u00e9riaux\" width=\"460\" height=\"464\" \/><\/a><span>Module\u00a0 de Young. <\/span><\/b><span>Le module\u00a0 de Young est le module d&rsquo;\u00e9lasticit\u00e9 pour les contraintes de traction et de compression dans le r\u00e9gime d&rsquo;\u00e9lasticit\u00e9 lin\u00e9aire d&rsquo;une d\u00e9formation uniaxiale et est g\u00e9n\u00e9ralement \u00e9valu\u00e9 par des essais de traction.<\/span><\/li>\n<li><b><span>Module d&rsquo;\u00e9lasticit\u00e9 de cisaillement.\u00a0<\/span><\/b><span>Le module de cisaillement, ou module de rigidit\u00e9, est d\u00e9riv\u00e9 de la torsion d&rsquo;une \u00e9prouvette cylindrique.\u00a0Il d\u00e9crit la r\u00e9ponse du mat\u00e9riau \u00e0 la contrainte de cisaillement.\u00a0Son symbole est G. Le module de cisaillement est l&rsquo;une des nombreuses quantit\u00e9s permettant de mesurer la rigidit\u00e9 des mat\u00e9riaux et il appara\u00eet dans la loi de Hooke g\u00e9n\u00e9ralis\u00e9e.<\/span><\/li>\n<li><b><span>Module d&rsquo;\u00e9lasticit\u00e9 de masse.\u00a0<\/span><\/b><span>Le module d&rsquo;\u00e9lasticit\u00e9 de masse d\u00e9crit l&rsquo;\u00e9lasticit\u00e9 volum\u00e9trique ou la tendance d&rsquo;un objet \u00e0 se d\u00e9former dans toutes les directions lorsqu&rsquo;il est uniform\u00e9ment charg\u00e9 dans toutes les directions.\u00a0Par exemple, il d\u00e9crit la r\u00e9ponse \u00e9lastique \u00e0 la pression hydrostatique et \u00e0 la tension \u00e9quilat\u00e9rale (comme la pression au fond de l&rsquo;oc\u00e9an ou d&rsquo;une piscine profonde).\u00a0C&rsquo;est aussi la propri\u00e9t\u00e9 d&rsquo;un mat\u00e9riau qui d\u00e9termine la r\u00e9ponse \u00e9lastique \u00e0 l&rsquo;application d&rsquo;une contrainte.\u00a0Pour un fluide, seul le module de masse est significatif.<\/span><\/li>\n<\/ul>\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>Force<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/strength\/\" class=\"su-button su-button-style-flat\" style=\"color:#606060;background-color:#ffffff;border-color:#cccccc;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>la loi de Hooke<\/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,\u00a0la loi de Hooke, 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 la loi de Hooke - D\u00e9finition | Propri\u00e9t\u00e9s mat\u00e9rielles<\/title>\n<meta name=\"description\" content=\"La loi de Hooke d\u00e9crit le comportement d&#039;une barre dans la r\u00e9gion \u00e9lastique. 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