{"id":9033,"date":"2025-06-23T09:46:32","date_gmt":"2025-06-23T09:46:32","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=9033"},"modified":"2025-06-23T09:46:32","modified_gmt":"2025-06-23T09:46:32","slug":"jaka-je-houzevnatost-hliniku-7075-ve-srovnani-s-oceli","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/how-does-the-toughness-of-7075-aluminum-compare-to-steel\/","title":{"rendered":"Jak\u00e1 je hou\u017eevnatost hlin\u00edku 7075 ve srovn\u00e1n\u00ed s ocel\u00ed?"},"content":{"rendered":"

\"Obr\u00e1b\u011bn\u00e1
Hlin\u00edkov\u00e1 trubka 7075 s vysokou pevnost\u00ed, ale ni\u017e\u0161\u00ed lomovou hou\u017eevnatost\u00ed ne\u017e ocel.<\/figcaption><\/figure>\n<\/p>\n

Rozhodujete se mezi hlin\u00edkem a ocel\u00ed pro vysoce v\u00fdkonn\u00fd d\u00edl? Neignorujte hou\u017eevnatost - m\u016f\u017ee rozhodnout o va\u0161\u00ed konstrukci.<\/p>\n

Hlin\u00edk 7075 m\u00e1 ni\u017e\u0161\u00ed lomovou hou\u017eevnatost ne\u017e ocel. Ocel je 2-6kr\u00e1t hou\u017eevnat\u011bj\u0161\u00ed, tak\u017ee je vhodn\u011bj\u0161\u00ed pro n\u00e1razy, \u00fanavu nebo chladn\u00e9 prost\u0159ed\u00ed.<\/strong><\/p>\n

Hlin\u00edk 7075 je sice proslul\u00fd pom\u011brem pevnosti a hmotnosti, ale v absorpci energie p\u0159ed zlomen\u00edm se oceli nevyrovn\u00e1. Poj\u010fme si rozebrat, co hou\u017eevnatost skute\u010dn\u011b znamen\u00e1 a kdy je kter\u00fd materi\u00e1l nejlep\u0161\u00ed.<\/p>\n

Jak\u00e1 je definice hou\u017eevnatosti?<\/h2>\n

Nev\u00edte, co je to pevnost, tvrdost a hou\u017eevnatost? Nejste sami. Nejsou to stejn\u00e9 pojmy.<\/p>\n

Hou\u017eevnatost znamen\u00e1, kolik energie m\u016f\u017ee materi\u00e1l absorbovat, ne\u017e se zlom\u00ed. Z\u00e1vis\u00ed na pevnosti i ta\u017enosti.<\/strong><\/p>\n

\"CNC
Hlin\u00edkov\u00fd konstruk\u010dn\u00ed prvek vhodn\u00fd pro lehk\u00e9 stavby, m\u00e9n\u011b optim\u00e1ln\u00ed pro pou\u017eit\u00ed p\u0159i vysok\u00e9m zat\u00ed\u017een\u00ed.<\/figcaption><\/figure>\n<\/p>\n

Co se skute\u010dn\u011b m\u011b\u0159\u00ed hou\u017eevnatost\u00ed<\/h3>\n

Hou\u017eevnatost je schopnost materi\u00e1lu odol\u00e1vat n\u00e1raz\u016fm a l\u00e1m\u00e1n\u00ed. Technicky vzato je to plocha pod k\u0159ivkou nap\u011bt\u00ed-deformace<\/strong>. \u010c\u00edm v\u00edce energie dok\u00e1\u017ee absorbovat, ne\u017e se zlom\u00ed, t\u00edm je pevn\u011bj\u0161\u00ed.<\/p>\n

Nejb\u011b\u017en\u011bj\u0161\u00ed metrikou pou\u017e\u00edvanou ve stroj\u00edrenstv\u00ed je:<\/p>\n

    \n
  • Lomov\u00e1 hou\u017eevnatost (K_IC)<\/strong>, m\u011b\u0159eno v MPa-\u221am<\/li>\n
  • Pou\u017e\u00edv\u00e1 se k hodnocen\u00ed odolnosti proti r\u016fstu trhlin<\/li>\n<\/ul>\n

    Kl\u00ed\u010dov\u00e9 slo\u017eky hou\u017eevnatosti<\/h3>\n
      \n
    • S\u00edla<\/strong>: Kolik n\u00e1kladu unese<\/li>\n
    • Ta\u017enost<\/strong>: Jak moc se m\u016f\u017ee nat\u00e1hnout nebo deformovat, ne\u017e se zlom\u00ed.<\/li>\n
    • Citlivost z\u00e1\u0159ezu<\/strong>: Jak reaguje na vady nebo praskliny<\/li>\n<\/ul>\n

      Materi\u00e1ly s vysokou hou\u017eevnatost\u00ed odol\u00e1vaj\u00ed n\u00e1hl\u00fdm zlom\u016fm. Materi\u00e1ly s n\u00edzkou hou\u017eevnatost\u00ed mohou p\u0159i nam\u00e1h\u00e1n\u00ed nebo n\u00e1razu prasknout.<\/p>\n

      <\/svg> Hou\u017eevnatost je tot\u00e9\u017e co s\u00edla.<\/b>False<\/span><\/p>

      Pevnost se vztahuje k nosnosti, zat\u00edmco hou\u017eevnatost m\u011b\u0159\u00ed absorpci energie p\u0159ed lomem.<\/p><\/div>\n

      <\/svg> Lomov\u00e1 hou\u017eevnatost je kl\u00ed\u010dov\u00fdm m\u011b\u0159\u00edtkem hou\u017eevnatosti materi\u00e1lu.<\/b>Pravda<\/span><\/p>

      Lomov\u00e1 hou\u017eevnatost (K_IC) ud\u00e1v\u00e1 schopnost materi\u00e1lu'odol\u00e1vat \u0161\u00ed\u0159en\u00ed trhlin.<\/p><\/div>\n

      Jak\u00e9 je srovn\u00e1n\u00ed hodnot odolnosti?<\/h2>\n

      Mysl\u00edte si, \u017ee v\u0161echny pevn\u00e9 materi\u00e1ly jsou tak\u00e9 hou\u017eevnat\u00e9? Ne tak docela.<\/p>\n

      Hlin\u00edk 7075 m\u00e1 lomovou hou\u017eevnatost ~29 MPa-\u221am, zat\u00edmco b\u011b\u017en\u00e9 oceli se pohybuj\u00ed v rozmez\u00ed 50 a\u017e 175 MPa-\u221am. Ocel je obvykle 2-6kr\u00e1t hou\u017eevnat\u011bj\u0161\u00ed.<\/strong><\/p>\n

      \"Profilovan\u00fd
      P\u0159\u00edklad hlin\u00edkov\u00e9ho profilu, u kter\u00e9ho m\u00e1 p\u0159ednost obrobitelnost p\u0159ed hou\u017eevnatost\u00ed<\/figcaption><\/figure>\n<\/p>\n

      Tabulka: Hodnoty lomov\u00e9 hou\u017eevnatosti<\/h3>\n\n\n\n\n\n\n\n\n
      Typ materi\u00e1lu<\/th>\nLomov\u00e1 hou\u017eevnatost (K_IC)<\/th>\n<\/tr>\n<\/thead>\n
      Hlin\u00edk 7075-T6\/T651<\/td>\n~29 MPa-\u221am<\/td>\n<\/tr>\n
      Konstruk\u010dn\u00ed ocel (A36, m\u011bkk\u00e1 ocel)<\/td>\n~50 MPa-\u221am<\/td>\n<\/tr>\n
      N\u00e1strojov\u00e1 ocel (D2, H13)<\/td>\n60-100 MPa-\u221am<\/td>\n<\/tr>\n
      Vysoce hou\u017eevnat\u00e1 ocel (4340, maraging)<\/td>\n100-175 MPa-\u221am<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Hlin\u00edk 7075 je pevn\u00fd a lehk\u00fd. Ve srovn\u00e1n\u00ed s ocel\u00ed je v\u0161ak pom\u011brn\u011b k\u0159ehk\u00fd. Pokud je pravd\u011bpodobn\u00e9, \u017ee v\u00e1\u0161 d\u00edl bude vystaven n\u00e1raz\u016fm, p\u00e1d\u016fm nebo siln\u00fdm vibrac\u00edm, je to d\u016fle\u017eit\u00e9.<\/p>\n

      Hlin\u00edk prask\u00e1 d\u0159\u00edve p\u0159i koncentraci nap\u011bt\u00ed nebo n\u00e1razu. Schopnost oceli absorbovat n\u00e1razy bez poru\u0161en\u00ed je d\u016fvodem, pro\u010d se st\u00e1le pou\u017e\u00edv\u00e1 v mostech, n\u00e1stroj\u00edch a brn\u011bn\u00ed.<\/p>\n

      <\/svg> Hlin\u00edk 7075 je pevn\u011bj\u0161\u00ed ne\u017e b\u011b\u017en\u00e1 konstruk\u010dn\u00ed ocel.<\/b>False<\/span><\/p>

      Konstruk\u010dn\u00ed ocel m\u00e1 obvykle vy\u0161\u0161\u00ed lomovou hou\u017eevnatost ne\u017e hlin\u00edk 7075.<\/p><\/div>\n

      <\/svg> Ocelov\u00e9 slitiny mohou dosahovat hodnot lomov\u00e9 hou\u017eevnatosti p\u0159es 150 MPa-\u221am.<\/b>Pravda<\/span><\/p>

      Vysoce v\u00fdkonn\u00e9 oceli, jako je maraging nebo kalen\u00e1 4340, mohou p\u0159ekro\u010dit 150 MPa-\u221am.<\/p><\/div>\n

      V jak\u00fdch aplikac\u00edch je ocel lep\u0161\u00ed?<\/h2>\n

      Zaj\u00edm\u00e1 v\u00e1s, kdy je ocel lep\u0161\u00ed volbou? Z\u00e1le\u017e\u00ed na nam\u00e1h\u00e1n\u00ed, n\u00e1razech a \u00fanav\u011b.<\/p>\n

      Ocel p\u0159ekon\u00e1v\u00e1 hlin\u00edk v aplikac\u00edch s velkou n\u00e1razovou z\u00e1t\u011b\u017e\u00ed, n\u00e1chyln\u00fdch k \u00fanav\u011b a p\u0159i n\u00edzk\u00fdch teplot\u00e1ch d\u00edky sv\u00e9 vy\u0161\u0161\u00ed hou\u017eevnatosti.<\/strong><\/p>\n

      \"Hlin\u00edkov\u00fd
      Extrudovan\u00fd hlin\u00edkov\u00fd profil pou\u017e\u00edvan\u00fd tam, kde z\u00e1le\u017e\u00ed v\u00edce na hmotnosti ne\u017e na odolnosti proti zlomen\u00ed.<\/figcaption><\/figure>\n<\/p>\n

      Hlavn\u00ed v\u00fdhody oceli<\/h3>\n
        \n
      • Odolnost proti n\u00e1raz\u016fm<\/strong>: Ocel absorbuje v\u00edce energie, ani\u017e by praskla<\/li>\n
      • \u00danavov\u00fd \u017eivot<\/strong>: Vydr\u017e\u00ed d\u00e9le p\u0159i opakovan\u00fdch z\u00e1t\u011b\u017eov\u00fdch cyklech<\/li>\n
      • Pou\u017eit\u00ed v chladn\u00e9m po\u010das\u00ed<\/strong>: Hlin\u00edk m\u016f\u017ee b\u00fdt k\u0159ehk\u00fd, ocel z\u016fst\u00e1v\u00e1 hou\u017eevnat\u00e1.<\/li>\n
      • Sva\u0159itelnost<\/strong>: Ocel se sn\u00e1ze sva\u0159uje a zachov\u00e1v\u00e1 si pevnost i po sva\u0159en\u00ed.<\/li>\n<\/ul>\n

        Typick\u00e1 pou\u017eit\u00ed, kde ocel v\u00edt\u011bz\u00ed<\/h3>\n\n\n\n\n\n\n\n\n\n
        Aplikace<\/th>\nPro\u010d ocel vynik\u00e1<\/th>\n<\/tr>\n<\/thead>\n
        T\u011b\u017ek\u00e9 stroje<\/td>\nVysok\u00e9 n\u00e1razov\u00e9 zat\u00ed\u017een\u00ed<\/td>\n<\/tr>\n
        Je\u0159\u00e1by, mosty<\/td>\nOdolnost proti \u00fanav\u011b<\/td>\n<\/tr>\n
        Zbroj a vojensk\u00e9 vybaven\u00ed<\/td>\nVysok\u00e1 absorpce energie<\/td>\n<\/tr>\n
        Pru\u017einy, h\u0159\u00eddele<\/td>\nZat\u00ed\u017een\u00ed v krutu a cyklick\u00e9 zat\u00ed\u017een\u00ed<\/td>\n<\/tr>\n
        Prost\u0159ed\u00ed s n\u00edzkou teplotou<\/td>\nOcel si zachov\u00e1v\u00e1 ta\u017enost<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Hlin\u00edkov\u00e9 d\u00edly \u010dasto selh\u00e1vaj\u00ed jako prvn\u00ed, jsou-li vystaveny n\u00e1raz\u016fm, prasklin\u00e1m nebo defekt\u016fm. Ocel jim odol\u00e1v\u00e1 l\u00e9pe, tak\u017ee je bezpe\u010dn\u011bj\u0161\u00ed pro konstruk\u010dn\u00ed pou\u017eit\u00ed nebo pro pou\u017eit\u00ed s t\u011b\u017ek\u00fdmi n\u00e1stroji.<\/p>\n

        <\/svg> Ocel m\u00e1 lep\u0161\u00ed vlastnosti ne\u017e hlin\u00edk 7075 v podm\u00ednk\u00e1ch vysok\u00e9ho n\u00e1razov\u00e9ho a \u00fanavov\u00e9ho zat\u00ed\u017een\u00ed.<\/b>Pravda<\/span><\/p>

        Vy\u0161\u0161\u00ed lomov\u00e1 hou\u017eevnatost oceli'j\u00ed d\u00e1v\u00e1 lep\u0161\u00ed odolnost proti prask\u00e1n\u00ed p\u0159i opakovan\u00e9m nam\u00e1h\u00e1n\u00ed nebo n\u00e1razech.<\/p><\/div>\n

        <\/svg> Hlin\u00edk 7075 je za v\u0161ech podm\u00ednek lep\u0161\u00ed ne\u017e ocel.<\/b>False<\/span><\/p>

        Ocel p\u0159ekon\u00e1v\u00e1 hlin\u00edk v aplikac\u00edch kritick\u00fdch z hlediska hou\u017eevnatosti.<\/p><\/div>\n

        Kdy je vhodn\u011bj\u0161\u00ed hlin\u00edk 7075?<\/h2>\n

        Mysl\u00edte si, \u017ee ocel je v\u017edy lep\u0161\u00ed? Ne tak docela. Hlin\u00edk m\u00e1 sv\u00e9 m\u00edsto.<\/p>\n

        Hlin\u00edk 7075 je ide\u00e1ln\u00ed, pokud pot\u0159ebujete vysokou pevnost p\u0159i n\u00edzk\u00e9 hmotnosti, nap\u0159\u00edklad v letectv\u00ed, z\u00e1vod\u011bn\u00ed nebo u lehk\u00fdch r\u00e1m\u016f.<\/strong><\/p>\n

        \"Hlin\u00edkov\u00fd
        Obr\u00e1b\u011bn\u00fd hlin\u00edkov\u00fd d\u00edl vhodn\u00fd pro statick\u00e9 zat\u00ed\u017een\u00ed, nedoporu\u010duje se pro prost\u0159ed\u00ed s vysokou \u00fanavou.<\/figcaption><\/figure>\n<\/p>\n

        Pro\u010d v n\u011bkter\u00fdch p\u0159\u00edpadech v\u00edt\u011bz\u00ed hlin\u00edk<\/h3>\n
          \n
        • Vysok\u00e1 specifick\u00e1 pevnost<\/strong>: Siln\u00fd vzhledem ke sv\u00e9 hmotnosti<\/li>\n
        • Sn\u00ed\u017een\u00ed hmotnosti<\/strong>: Kritick\u00e9 ve vozidlech, na kolech a v letadlech<\/li>\n
        • Obrobitelnost<\/strong>: Snadn\u011bj\u0161\u00ed \u0159ez\u00e1n\u00ed, tvarov\u00e1n\u00ed a vrt\u00e1n\u00ed<\/li>\n
        • Odolnost proti korozi<\/strong>: Dobr\u00fd s vhodn\u00fdm povlakem nebo eloxov\u00e1n\u00edm<\/li>\n<\/ul>\n

          Kdy zvolit 7075<\/h3>\n\n\n\n\n\n\n\n\n\n
          P\u0159\u00edpad pou\u017eit\u00ed<\/th>\nPro\u010d je 7075 lep\u0161\u00ed<\/th>\n<\/tr>\n<\/thead>\n
          R\u00e1my letadel<\/td>\n\u00daspora hmotnosti, st\u00e1le siln\u00fd<\/td>\n<\/tr>\n
          D\u00edly pro z\u00e1vodn\u00ed kola<\/td>\nVysok\u00e1 pevnost v pom\u011bru k hmotnosti<\/td>\n<\/tr>\n
          P\u0159esn\u00e9 komponenty CNC<\/td>\nSnadn\u011bj\u0161\u00ed obr\u00e1b\u011bn\u00ed<\/td>\n<\/tr>\n
          Drony a robotika<\/td>\nLehk\u00e9 pohybov\u00e9 d\u00edly<\/td>\n<\/tr>\n
          N\u00e1stroje (ne\u00faderov\u00e9)<\/td>\nPevn\u00e9 a stabiln\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Hlin\u00edk 7075 poskytuje dostate\u010dnou pevnost pro v\u011bt\u0161inu zat\u00ed\u017een\u00ed a m\u016f\u017ee b\u00fdt navr\u017een tak, aby se zabr\u00e1nilo lom\u016fm. Obzvl\u00e1\u0161t\u011b dob\u0159e se osv\u011bd\u010duje tam, kde z\u00e1le\u017e\u00ed na ka\u017ed\u00e9m gramu.<\/p>\n

          Nen\u00ed ur\u010den pro hrub\u00e9 zach\u00e1zen\u00ed ani sva\u0159ov\u00e1n\u00ed, ale je ide\u00e1ln\u00ed pro chyt\u0159e navr\u017een\u00e9 lehk\u00e9 konstrukce.<\/p>\n

          <\/svg> Hlin\u00edk 7075 je ide\u00e1ln\u00ed pro leteck\u00fd pr\u016fmysl d\u00edky vysok\u00e9mu pom\u011bru pevnosti a hmotnosti.<\/b>Pravda<\/span><\/p>

          Materi\u00e1l 7075 nab\u00edz\u00ed vynikaj\u00edc\u00ed mechanickou pevnost a z\u00e1rove\u0148 je mnohem leh\u010d\u00ed ne\u017e ocel, co\u017e je ide\u00e1ln\u00ed pro r\u00e1my letadel.<\/p><\/div>\n

          <\/svg> Hlin\u00edk 7075 m\u016f\u017ee v hlubok\u00fdch tlakov\u00fdch n\u00e1dob\u00e1ch pod vodou p\u0159ekonat ocel.<\/b>False<\/span><\/p>

          Ocel l\u00e9pe zvl\u00e1d\u00e1 tlak a hou\u017eevnatost v takto n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch.<\/p><\/div>\n

          Z\u00e1v\u011br<\/h2>\n

          Hlin\u00edk 7075 je pevn\u00fd a lehk\u00fd, ale ocel je mnohem pevn\u011bj\u0161\u00ed. Pokud jsou kl\u00ed\u010dov\u00e9 n\u00e1razy a \u00fanava, v\u00edt\u011bz\u00ed ocel. Pokud z\u00e1le\u017e\u00ed na hmotnosti a obrobitelnosti, 7075 je nejlep\u0161\u00ed. Vyb\u00edrejte podle sv\u00fdch skute\u010dn\u00fdch pot\u0159eb.<\/p>","protected":false},"excerpt":{"rendered":"

          7075 aluminum tube with high strength but lower fracture toughness than steel Torn between aluminum and steel for a high-performance part? Don\u2019t ignore toughness\u2014it could make or break your design. 7075 aluminum has lower fracture toughness than steel. Steel is 2\u20136 times tougher, making it better for impact, fatigue, or cold environments. While 7075 aluminum […]<\/p>\n","protected":false},"author":6,"featured_media":8582,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/9033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=9033"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/9033\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/8582"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=9033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=9033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=9033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}