{"id":5448,"date":"2025-09-18T12:00:28","date_gmt":"2025-09-18T10:00:28","guid":{"rendered":"https:\/\/blog.federnshop.com\/unavova-sila\/"},"modified":"2025-09-19T13:11:46","modified_gmt":"2025-09-19T11:11:46","slug":"unavova-sila","status":"publish","type":"post","link":"https:\/\/blog.federnshop.com\/cs\/unavova-sila\/","title":{"rendered":"\u00danavov\u00e1 s\u00edla"},"content":{"rendered":"<p>Term\u00edn \u00fanavov\u00e1 pevnost poch\u00e1z\u00ed z v\u011bdy o materi\u00e1lech. Popisuje deforma\u010dn\u00ed a poruchov\u00e9 chov\u00e1n\u00ed oscila\u010dn\u00edho (dynamicky) zat\u00ed\u017een\u00e9ho materi\u00e1lu po stanoven\u00fd po\u010det cykl\u016f. Zvl\u00e1\u0161t\u011b na<a href=\"https:\/\/blog.federnshop.com\/cs\/kovove-pruziny-pro-extremni-pripady\/\"> siln\u011b pou\u017e\u00edvan\u00e9 tla\u010dn\u00e9 pru\u017einy<\/a> je d\u016fle\u017eit\u00e9 zaznamenat \u00fanavovou s\u00edlu.<\/p>\n<h2>Jak se ur\u010duje \u00fanavov\u00e1 pevnost?<\/h2>\n<p>\u00danavov\u00e1 pevnost se vypo\u010d\u00edt\u00e1 pomoc\u00ed W\u00f6hlerova testu, z jeho\u017e v\u00fdsledk\u016f lze do diagramu \u00fanavov\u00e9 pevnosti na\u010drtnout tzv. W\u00f6hlerovu k\u0159ivku. V z\u00e1vislosti na deforma\u010dn\u00edm nap\u011bt\u00ed ud\u00e1v\u00e1 po\u010det zm\u011bn zat\u00ed\u017een\u00ed, kter\u00e9 materi\u00e1l vydr\u017e\u00ed. K\u0159ivka na obr\u00e1zku tak\u00e9 ukazuje, \u017ee lom p\u0159i nam\u00e1h\u00e1n\u00ed hluboko pod<a href=\"https:\/\/blog.federnshop.com\/zugfestigkeit-federwerkstoffe\/\"> pevnost v tahu<\/a> R<sub> m<\/sub> dojde. W\u00f6hlerovu k\u0159ivku lze rozd\u011blit na \u00fanavovou pevnost, \u00fanavovou pevnost a kr\u00e1tkodobou pevnost.<\/p>\n<figure id=\"attachment_5449\" aria-describedby=\"caption-attachment-5449\" style=\"width: 600px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5449\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/W\u00f6hlerkurve.jpg\" alt=\"W\u00f6hlerova k\u0159ivka, W\u00f6hlerova linie, W\u00f6hler\u016fv diagram\" width=\"600\" height=\"324\" data-wp-pid=\"2122\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/W\u00f6hlerkurve.jpg 800w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/W\u00f6hlerkurve-300x162.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/W\u00f6hlerkurve-600x324.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/W\u00f6hlerkurve-200x108.jpg 200w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-5449\" class=\"wp-caption-text\">W\u00f6hlerova k\u0159ivka s kr\u00e1tkodobou pevnost\u00ed, \u00fanavovou pevnost\u00ed a \u00fanavovou pevnost\u00ed<\/figcaption><\/figure>\n<p><span style=\"color: #b0cb1f;\"><strong>K.<\/strong><\/span> ozna\u010duje rozsah kr\u00e1tkodob\u00e9 \u00fanavov\u00e9 pevnosti nebo kr\u00e1tkodob\u00e9 pevnosti pod asi 10<sup> 4<\/sup> do 10<sup> 5<\/sup> Houpa\u010dka. K t\u00e9to \u00fanav\u011b doch\u00e1z\u00ed \u010dasto, zejm\u00e9na p\u0159i vysok\u00fdch amplitud\u00e1ch plastick\u00e9ho p\u0159etvo\u0159en\u00ed, a vede k p\u0159ed\u010dasn\u00e9mu selh\u00e1n\u00ed. Kr\u00e1tkodob\u00e1 pevnost m\u00e1 v\u0161ak pro technick\u00e9 po\u017eadavky mal\u00fd v\u00fdznam.<\/p>\n<p><strong><span style=\"color: #00a0e3;\">Z<\/span><\/strong> charakterizuje rozsah \u00fanavov\u00e9 s\u00edly (zkratka: \u00fanavov\u00e1 pevnost) nebo \u00fanavov\u00e9 s\u00edly mezi 10<sup> 4<\/sup> a v z\u00e1vislosti na materi\u00e1lu asi 2\u00b710<sup> 6<\/sup> houpa\u010dka. W\u00f6hlerova k\u0159ivka je t\u00e9m\u011b\u0159 rovn\u00e1 ve dvojit\u00e9m logaritmick\u00e9m zobrazen\u00ed.<\/p>\n<p><span style=\"color: #e31e24;\"><strong>D<\/strong><\/span> ozna\u010duje \u00fanavovou pevnost nebo zkr\u00e1cen\u011b \u00fanavovou pevnost. U feriticko-perlitick\u00fdch ocel\u00ed to za\u010d\u00edn\u00e1 kolem 10<sup> 6<\/sup> a\u017e 5\u00b710<sup> 6<\/sup> zm\u011bny zat\u00ed\u017een\u00ed na. Neust\u00e1l\u00e1 koroze a zna\u010dn\u011b zv\u00fd\u0161en\u00e9 teploty, kter\u00fdm je sou\u010d\u00e1st vystavena, znamenaj\u00ed, \u017ee ji\u017e nelze zaru\u010dit \u00fanavovou pevnost. Krom\u011b \u00fanavov\u00e9 pevnosti vysoce nam\u00e1han\u00fdch tla\u010dn\u00fdch pru\u017ein je t\u0159eba vz\u00edt v \u00favahu tak\u00e9 relaxaci jako procento ztr\u00e1ty s\u00edly v z\u00e1vislosti na materi\u00e1lu.<\/p>\n<p>Zde naleznete v\u00edce informac\u00ed o<a href=\"https:\/\/blog.federnshop.com\/cs\/relaxace-v-pramenech\/\"> relaxace v kovov\u00fdch pru\u017ein\u00e1ch<\/a> ,<a href=\"https:\/\/www.youtube.com\/watch?v=EusjLYwYpLE\" target=\"_blank\" rel=\"noopener noreferrer\"> v\u00fdpo\u010det \u00fanavov\u00e9 pevnosti tla\u010dn\u00fdch pru\u017ein (video)<\/a> a p\u00e1r<a href=\"https:\/\/books.google.de\/books?id=FOAhBgAAQBAJ&amp;pg=RA1-PA102&amp;dq=Dauerfestigkeitsschaubilder+roloff\/matek+tb10-13&amp;hl=de&amp;sa=X&amp;ved=0ahUKEwjxptvuyMrNAhUKEywKHc-hAP0Q6AEIMTAB#v=onepage&amp;q=Dauerfestigkeitsschaubilder%20roloff%2Fmatek%20tb10-13&amp;f=false\"> diagramy \u00fanavov\u00e9 pevnosti r\u016fzn\u00fdch materi\u00e1l\u016f pru\u017ein<\/a> z knihy Roloff \/ Matek \u201eMaschinenelemente\u201c (strana 102\/103).<\/p>\n<p>&nbsp;<\/p>\n<p><em>Pro v\u00edce informac\u00ed:<\/em><\/p>\n<ul>\n<li><a href=\"https:\/\/blog.federnshop.com\/cs\/goodmanuv-diagram\/\">Goodman\u016fv graf<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/blog.federnshop.com\/cs\/druhy-tlakovych-pruzin\/\">Druhy tlakov\u00fdch pru\u017ein<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/blog.federnshop.com\/cs\/druhy-napeti-pro-tazne-pruziny\/\" target=\"_blank\" rel=\"noopener noreferrer\">Druhy nap\u00ednac\u00edch pru\u017ein<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/de\/federnberechnung_auswahl.html\" target=\"_blank\" rel=\"noopener noreferrer\">Jarn\u00ed v\u00fdpo\u010det WinFSB online<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Term\u00edn \u00fanavov\u00e1 pevnost poch\u00e1z\u00ed z v\u011bdy o materi\u00e1lech. Popisuje deforma\u010dn\u00ed a poruchov\u00e9 chov\u00e1n\u00ed oscila\u010dn\u00edho (dynamicky) zat\u00ed\u017een\u00e9ho materi\u00e1lu po stanoven\u00fd po\u010det cykl\u016f. Zvl\u00e1\u0161t\u011b na siln\u011b pou\u017e\u00edvan\u00e9 tla\u010dn\u00e9 pru\u017einy je d\u016fle\u017eit\u00e9 zaznamenat \u00fanavovou s\u00edlu. Jak se ur\u010duje \u00fanavov\u00e1 pevnost? \u00danavov\u00e1 pevnost se<\/p>\n","protected":false},"author":4,"featured_media":5449,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[919,452],"tags":[1139,1144,1143,608,1140,1141,1142],"class_list":["post-5448","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dratene-pruziny","category-znalost","tag-dauerfestigkeit-cs","tag-dauerfestigkeitsschaubilder-cs","tag-dauerschwingfestigkeit-cs","tag-druckfedern-cs","tag-kurzzeitschwingfestigkeit-cs","tag-zeitfestigkeit-cs","tag-zeitschwingfestigkeit-cs"],"_links":{"self":[{"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/posts\/5448","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/comments?post=5448"}],"version-history":[{"count":2,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/posts\/5448\/revisions"}],"predecessor-version":[{"id":11981,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/posts\/5448\/revisions\/11981"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/media\/5449"}],"wp:attachment":[{"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/media?parent=5448"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/categories?post=5448"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.federnshop.com\/cs\/wp-json\/wp\/v2\/tags?post=5448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}