{"id":116750,"date":"2022-05-23T17:04:26","date_gmt":"2022-05-23T16:04:26","guid":{"rendered":"https:\/\/material-properties.org\/quest-ce-que-la-permeabilite-permeabilite-relative-definition\/"},"modified":"2022-05-24T09:12:32","modified_gmt":"2022-05-24T08:12:32","slug":"quest-ce-que-la-permeabilite-permeabilite-relative-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quest-ce-que-la-permeabilite-permeabilite-relative-definition\/","title":{"rendered":"Qu’est-ce que la perm\u00e9abilit\u00e9 – Perm\u00e9abilit\u00e9 relative – D\u00e9finition"},"content":{"rendered":"

En \u00e9lectromagn\u00e9tisme, la perm\u00e9abilit\u00e9 est la mesure de la r\u00e9sistance d’une substance \u00e0 la formation d’un champ magn\u00e9tique.\u00a0Cette constante est tr\u00e8s importante, car l’une des propri\u00e9t\u00e9s magn\u00e9tiques importantes est la perm\u00e9abilit\u00e9 relative (sans dimension), le rapport de la perm\u00e9abilit\u00e9 dans un mat\u00e9riau \u00e0 la perm\u00e9abilit\u00e9 dans le vide.<\/div><\/div><\/span><\/p>\n

<\/div><\/span><\/p>\n

\n

En \u00e9lectromagn\u00e9tisme, la\u00a0<\/span>perm\u00e9abilit\u00e9<\/span><\/strong>\u00a0est la mesure de la\u00a0<\/span>r\u00e9sistance<\/span><\/strong>\u00a0d’une substance \u00e0 la\u00a0<\/span>formation d’un champ magn\u00e9tique<\/span><\/strong>.\u00a0Le champ magn\u00e9tique auxiliaire H repr\u00e9sente comment un champ magn\u00e9tique B influence l’organisation des dip\u00f4les magn\u00e9tiques dans une substance donn\u00e9e.\u00a0L’intensit\u00e9 du champ magn\u00e9tique et la densit\u00e9 de flux sont li\u00e9es selon:<\/span><\/p>\n

\"perm\u00e9abilit\u00e9\"<\/a><\/p>\n

Dans cette \u00e9quation, B repr\u00e9sente l’amplitude de l’intensit\u00e9 du champ interne dans une substance soumise \u00e0 un champ H.\u00a0La\u00a0<\/span>perm\u00e9abilit\u00e9<\/span><\/strong>\u00a0a des dimensions de\u00a0<\/span>webers par amp\u00e8re-m\u00e8tre<\/span><\/strong>\u00a0(Wb\/Am) ou\u00a0<\/span>de henrys par m\u00e8tre<\/span><\/strong>\u00a0(H\/m).\u00a0La constante de perm\u00e9abilit\u00e9\u00a0<\/span>\u03bc<\/span>0<\/span><\/sub><\/strong>, \u00e9galement appel\u00e9e constante magn\u00e9tique ou\u00a0<\/span>perm\u00e9abilit\u00e9 de l’espace libre<\/span><\/strong>, est une mesure de la quantit\u00e9 de r\u00e9sistance rencontr\u00e9e lors de la formation d’un champ magn\u00e9tique dans un vide classique.\u00a0Cette constante est tr\u00e8s importante, car l’une des propri\u00e9t\u00e9s magn\u00e9tiques importantes est la\u00a0<\/span>perm\u00e9abilit\u00e9 relative<\/span><\/strong>\u00a0(sans dimension), le rapport de la perm\u00e9abilit\u00e9 dans un mat\u00e9riau \u00e0 la perm\u00e9abilit\u00e9 dans le vide.<\/span><\/p>\n

\"perm\u00e9abilit\u00e9<\/a><\/p>\n

Selon la r\u00e9f\u00e9rence NIST sur les constantes physiques fondamentales, la\u00a0<\/span>constante magn\u00e9tique<\/span><\/strong>\u00a0a la valeur exacte (d\u00e9finie)<\/span><\/p>\n

\u03bc\u00a0<\/span><\/em>0<\/span><\/sub>\u00a0\u00a0= 4\u03c0 \u00d7 10\u00a0<\/span>\u22127<\/span><\/sup>\u00a0\u00a0H\/m \u2248 12,57\u00d710\u00a0<\/span>\u22127<\/span><\/sup>\u00a0\u00a0H\/m.<\/span><\/p>\n

Une propri\u00e9t\u00e9 \u00e9troitement li\u00e9e des mat\u00e9riaux est\u00a0<\/span>la susceptibilit\u00e9 magn\u00e9tique<\/span><\/strong>, qui est un facteur de proportionnalit\u00e9 sans dimension qui indique le\u00a0<\/span>degr\u00e9 de magn\u00e9tisation<\/span><\/strong>\u00a0d’un mat\u00e9riau en r\u00e9ponse \u00e0 un champ magn\u00e9tique appliqu\u00e9.<\/span><\/p>\n

\"susceptibilit\u00e9<\/a><\/p>\n

\"perm\u00e9abilit\u00e9<\/a>Ni\u00a0<\/span>\u03bc\u00a0<\/span>r<\/span><\/sub><\/strong>\u00a0ni\u00a0<\/span>\u03c7<\/span><\/strong>sont des constantes, car elles peuvent varier avec la position dans le milieu. Ils d\u00e9pendent non seulement du mat\u00e9riau mais aussi de l’amplitude du champ, H, de la fr\u00e9quence du champ magn\u00e9tique appliqu\u00e9, de l’humidit\u00e9, de la temp\u00e9rature et d’autres param\u00e8tres.\u00a0Presque tous les mat\u00e9riaux r\u00e9pondent \u00e0 un champ magn\u00e9tique en devenant magn\u00e9tis\u00e9s, mais la plupart sont paramagn\u00e9tiques avec une r\u00e9ponse si faible qu’elle n’est d’aucune utilit\u00e9 pratique.\u00a0Quelques-uns, cependant, contiennent des atomes qui ont de grands moments dipolaires et ont la capacit\u00e9 de magn\u00e9tiser spontan\u00e9ment (c’est-\u00e0-dire d’aligner leurs dip\u00f4les en parall\u00e8le).\u00a0Ceux-ci sont appel\u00e9s mat\u00e9riaux ferromagn\u00e9tiques et ferrimagn\u00e9tiques (le second est appel\u00e9 ferrites en abr\u00e9g\u00e9), et ce sont eux qui ont une r\u00e9elle utilit\u00e9 pratique. Les mat\u00e9riaux ferromagn\u00e9tiques, ferrimagn\u00e9tiques ou antiferromagn\u00e9tiques poss\u00e8dent une magn\u00e9tisation permanente m\u00eame sans champ magn\u00e9tique externe et n’ont pas une susceptibilit\u00e9 au champ nul bien d\u00e9finie.<\/span><\/p>\n

<\/span><\/p><\/div><\/div><\/span><\/p>\n

\n

<\/span>References :<\/div>
\u00a0<\/div><\/div><\/div><\/span>Science des mat\u00e9riaux:<\/span><\/strong><\/p>\n
    \n
  1. D\u00e9partement am\u00e9ricain de l’\u00e9nergie, science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 1 et 2. Janvier 1993.<\/span><\/li>\n
  2. D\u00e9partement am\u00e9ricain de l’\u00e9nergie, science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 2 et 2. Janvier 1993.<\/span><\/li>\n
  3. 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
  4. 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
  5. 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
  6. Gonzalez-Vi\u00f1as, W. & Mancini, HL (2004).\u00a0Une introduction \u00e0 la science des mat\u00e9riaux.\u00a0Presse universitaire de Princeton.\u00a0ISBN 978-0-691-07097-1<\/span><\/li>\n
  7. 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
  8. 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

    <\/span><\/p><\/div><\/div>

    <\/div>
    <\/div>
    <\/div><\/div>
    \n

    Voir au dessus:<\/span><\/h2>\n

    Propri\u00e9t\u00e9s magn\u00e9tiques\"\" <\/span><\/a><\/span><\/p><\/div><\/div>

    <\/div><\/div><\/span><\/p>\n

    <\/div><\/span><\/p>\n

    Nous esp\u00e9rons que cet article,\u00a0<\/span>Perm\u00e9abilit\u00e9 – Perm\u00e9abilit\u00e9 relative<\/span><\/strong>, vous aidera.\u00a0Si oui,\u00a0<\/span>donnez-nous un like<\/span><\/strong>\u00a0dans la barre lat\u00e9rale.\u00a0L’objectif principal de ce site Web est d’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":"

    Nous esp\u00e9rons que cet article,\u00a0Perm\u00e9abilit\u00e9 – Perm\u00e9abilit\u00e9 relative, vous aidera.\u00a0Si oui,\u00a0donnez-nous un like\u00a0dans la barre lat\u00e9rale.\u00a0L’objectif principal de ce site Web est d’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":"\nQu'est-ce que la perm\u00e9abilit\u00e9 - Perm\u00e9abilit\u00e9 relative - D\u00e9finition | Propri\u00e9t\u00e9s mat\u00e9rielles<\/title>\n<meta name=\"description\" content=\"En \u00e9lectromagn\u00e9tisme, la perm\u00e9abilit\u00e9 est la mesure de la r\u00e9sistance d'une substance \u00e0 la formation d'un champ magn\u00e9tique. Cette constante est tr\u00e8s importante, car l'une des propri\u00e9t\u00e9s magn\u00e9tiques importantes est la perm\u00e9abilit\u00e9 relative (sans dimension), le rapport de la perm\u00e9abilit\u00e9 dans un mat\u00e9riau \u00e0 la perm\u00e9abilit\u00e9 dans le vide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/material-properties.org\/fr\/quest-ce-que-la-permeabilite-permeabilite-relative-definition\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu'est-ce que la perm\u00e9abilit\u00e9 - Perm\u00e9abilit\u00e9 relative - D\u00e9finition | Propri\u00e9t\u00e9s mat\u00e9rielles\" \/>\n<meta property=\"og:description\" content=\"En \u00e9lectromagn\u00e9tisme, la perm\u00e9abilit\u00e9 est la mesure de la r\u00e9sistance d'une substance \u00e0 la formation d'un champ magn\u00e9tique. 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