{"id":260,"date":"2017-01-03T14:51:24","date_gmt":"2017-01-03T14:51:24","guid":{"rendered":"http:\/\/www.wood-maxx.ca\/?page_id=260\/"},"modified":"2017-01-19T16:39:41","modified_gmt":"2017-01-19T16:39:41","slug":"janka","status":"publish","type":"page","link":"https:\/\/www.wood-maxx.ca\/fr\/janka\/","title":{"rendered":"\u00c9chelle de duret\u00e9 Janka"},"content":{"rendered":"<p><a href=\"http:\/\/wood-maxx.ca\/en\/wp-content\/uploads\/2014\/11\/jankahardness.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-115 size-full\" src=\"http:\/\/wood-maxx.ca\/en\/wp-content\/uploads\/2014\/11\/jankahardness.gif\" alt=\"jankahardness\" width=\"605\" height=\"795\" \/><\/a><\/p>\n<p>Le <b>test de duret\u00e9 Janka<\/b> mesure la r\u00e9sistance d&rsquo;un \u00e9chantillon de bois \u00e0 bosses et \u00e0 l&rsquo;usure. Elle mesure la <a title=\"Indentation hardness\" href=\"http:\/\/en.wikipedia.org\/wiki\/Indentation_hardness\">force n\u00e9cessaire pour incorporer<\/a> une bille en acier de 11,28 mm (.444 po) dans le bois \u00e0 la moiti\u00e9 du diam\u00e8tre de la balle. Ce proc\u00e9d\u00e9 laisse une empreinte. Une utilisation commune d&rsquo;\u00e9valuations de duret\u00e9 Janka est de d\u00e9terminer si une esp\u00e8ce est pr\u00eate \u00e0 l&#8217;emploi tel que <a title=\"Wood flooring\" href=\"http:\/\/en.wikipedia.org\/wiki\/Wood_flooring\">le plancher <\/a>.<\/p>\n<p>La duret\u00e9 du bois varie avec la direction du <a title=\"Wood grain\" href=\"http:\/\/en.wikipedia.org\/wiki\/Wood_grain\">grain du bois<\/a>. Essai sur la surface d\u2019une planche, perpendiculaire au grain, est cens\u00e9 \u00eatre de la \u00ab duret\u00e9 de c\u00f4t\u00e9 \u00bb. Essai de la surface d&rsquo;une souche de coupe est appel\u00e9 un test de \u00abfin de duret\u00e9 \u00bb.<\/p>\n<p>Les r\u00e9sultats sont exprim\u00e9s de diff\u00e9rentes mani\u00e8res, ce qui peut conduire \u00e0 la confusion, surtout lorsque le nom des unit\u00e9s r\u00e9elles utilis\u00e9es est souvent pas joint. Aux \u00c9tats-Unis, la mesure est en <a class=\"mw-redirect\" title=\"Pound-force\" href=\"http:\/\/en.wikipedia.org\/wiki\/Pound-force\">livres-force<\/a> (lbf). En Su\u00e8de, il est en <a title=\"Kilogram-force\" href=\"http:\/\/en.wikipedia.org\/wiki\/Kilogram-force\">kilogrammes-force<\/a> (kgf), et en Australie, soit en <a title=\"Newton (unit)\" href=\"http:\/\/en.wikipedia.org\/wiki\/Newton_(unit)\">newtons<\/a> (N) or kilonewtons (kN). Parfois, les r\u00e9sultats sont consid\u00e9r\u00e9s comme des unit\u00e9s, par exemple \u00ab\u00a0660 Janka\u00a0\u00bb.<\/p>\n<p>Les r\u00e9sultats du test de duret\u00e9 Janka dans le tableau ci-dessous ont \u00e9t\u00e9 r\u00e9alis\u00e9es conform\u00e9ment \u00e0 la norme des m\u00e9thodes d&rsquo;essai <a class=\"mw-redirect\" title=\"ASTM\" href=\"http:\/\/en.wikipedia.org\/wiki\/ASTM\">ASTM<\/a> D 1037-12. Les stocks de bois test\u00e9s varie entre une \u00e9paisseur de 1 po et 2 po. Les chiffres de duret\u00e9 Janka tabl\u00e9s sont une moyenne. Il y a un \u00e9cart-type associ\u00e9 \u00e0 chaque esp\u00e8ce, mais ces valeurs ne sont pas donn\u00e9es. Il est important de noter qu&rsquo;aucun essai n&rsquo;a \u00e9t\u00e9 fait sur un plancher r\u00e9el. D&rsquo;autres facteurs influent sur la fa\u00e7on dont le plancher fonctionnent : le type de base pour l\u2019ing\u00e9nierie de rev\u00eatements de sol tels que HDF, le pin, peuplier, ch\u00eane, bouleau ; direction du grain et l\u2019\u00e9paisseur ; plancher ou surface sup\u00e9rieure \u00e0 l&rsquo;usure, etc. Le tableau ne doit ne pas \u00eatre consid\u00e9r\u00e9 comme un absolu ; Il est destin\u00e9 \u00e0 aider les gens \u00e0 comprendre quels bois sont plus difficiles que d\u2019autres.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le test de duret\u00e9 Janka mesure la r\u00e9sistance d&rsquo;un \u00e9chantillon de bois \u00e0 bosses et \u00e0 l&rsquo;usure. Elle mesure la force n\u00e9cessaire pour incorporer une bille en acier de 11,28 mm (.444 po) dans le bois \u00e0 la moiti\u00e9 du diam\u00e8tre de la balle. Ce proc\u00e9d\u00e9 laisse une empreinte. Une utilisation commune d&rsquo;\u00e9valuations de duret\u00e9 &hellip; <a href=\"https:\/\/www.wood-maxx.ca\/fr\/janka\/\">Continued<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-260","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00c9chelle de duret\u00e9 Janka - Wood-Maxx Screws<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wood-maxx.ca\/fr\/janka\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9chelle de duret\u00e9 Janka - Wood-Maxx Screws\" \/>\n<meta property=\"og:description\" content=\"Le test de duret\u00e9 Janka mesure la r\u00e9sistance d&rsquo;un \u00e9chantillon de bois \u00e0 bosses et \u00e0 l&rsquo;usure. Elle mesure la force n\u00e9cessaire pour incorporer une bille en acier de 11,28 mm (.444 po) dans le bois \u00e0 la moiti\u00e9 du diam\u00e8tre de la balle. Ce proc\u00e9d\u00e9 laisse une empreinte. 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Elle mesure la force n\u00e9cessaire pour incorporer une bille en acier de 11,28 mm (.444 po) dans le bois \u00e0 la moiti\u00e9 du diam\u00e8tre de la balle. Ce proc\u00e9d\u00e9 laisse une empreinte. 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