{"id":706,"date":"2026-02-27T08:33:23","date_gmt":"2026-02-27T08:33:23","guid":{"rendered":"https:\/\/www.teartester.com\/?post_type=standard&#038;p=706"},"modified":"2026-02-28T08:22:12","modified_gmt":"2026-02-28T08:22:12","slug":"astm-d751","status":"publish","type":"standard","link":"https:\/\/www.teartester.com\/cs\/standard\/astm-d751\/","title":{"rendered":"ASTM D751"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Norma pevnosti tkaniny p\u0159i roztr\u017een\u00ed a jej\u00ed v\u00fdznam<\/h2>\n\n\n\n<p>Na str\u00e1nk\u00e1ch <strong>ASTM D751 je norma pro pevnost tkaniny v roztr\u017een\u00ed.<\/strong> zaji\u0161\u0165uje, \u017ee potahovan\u00e9 tkaniny pou\u017e\u00edvan\u00e9 ve stanech, placht\u00e1ch, ochrann\u00fdch od\u011bvech, zdravotnick\u00fdch v\u00fdrobc\u00edch a interi\u00e9rech automobil\u016f si zachov\u00e1vaj\u00ed dostate\u010dnou odolnost proti \u0161\u00ed\u0159en\u00ed trhlin p\u016fsoben\u00edm vn\u011bj\u0161\u00edch sil. Na rozd\u00edl od jednoduch\u00fdch tahov\u00fdch zkou\u0161ek se odolnost proti roztr\u017een\u00ed zam\u011b\u0159uje na to, jak se p\u0159ed\u0159ezan\u00e1 nebo p\u0159irozen\u011b po\u0161kozen\u00e1 oblast p\u0159i zat\u00ed\u017een\u00ed d\u00e1le roz\u0161i\u0159uje.<\/p>\n\n\n\n<p>Toto hodnocen\u00ed pom\u00e1h\u00e1 u\u017eivatel\u016fm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identifikovat slab\u00e1 m\u00edsta struktury zp\u016fsoben\u00e1 tlou\u0161\u0165kou povlaku, konstrukc\u00ed tkaniny nebo p\u0159ilnavost\u00ed mezi vrstvami.<\/li>\n\n\n\n<li>Porovn\u00e1n\u00ed materi\u00e1l\u016f pro v\u00fdvoj produkt\u016f<\/li>\n\n\n\n<li>Zajistit soulad se zad\u00e1vac\u00edmi podm\u00ednkami a pr\u016fmyslov\u00fdmi specifikacemi<\/li>\n\n\n\n<li>P\u0159edpov\u00eddat v\u00fdkon v ter\u00e9nu a dlouhodobou \u017eivotnost<\/li>\n<\/ul>\n\n\n\n<p>Norma ASTM D751 popisuje v\u00edce zku\u0161ebn\u00edch metod trh\u00e1n\u00ed, co\u017e umo\u017e\u0148uje p\u0159esn\u011bj\u0161\u00ed a specifickou interpretaci v\u00fdsledk\u016f.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zkou\u0161ka tkaniny na roztr\u017een\u00ed podle normy ASTM D751<\/h2>\n\n\n\n<p>Je povoleno n\u011bkolik p\u0159\u00edstup\u016f pro <strong>zkou\u0161ka tkaniny na roztr\u017een\u00ed<\/strong>, ale norma se b\u011b\u017en\u011b zam\u011b\u0159uje na dv\u011b kategorie: kyvadlovou metodu a metodu odtr\u017een\u00ed jazyka. Tyto zkou\u0161ky simuluj\u00ed re\u00e1ln\u00e9 sc\u00e9n\u00e1\u0159e po\u0161kozen\u00ed, kdy se mal\u00fd \u0159ez m\u016f\u017ee d\u00e1le \u0161\u00ed\u0159it pod nap\u011bt\u00edm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kyvadlov\u00e1 metoda<\/h3>\n\n\n\n<p>Tato metoda odkazuje na normu ASTM D1424 a je vhodn\u00e1 pro tkaniny s obecn\u00fdm povlakem. Kyvadlo trh\u00e1 vzorek a m\u011b\u0159\u00ed energii pot\u0159ebnou k pokra\u010dov\u00e1n\u00ed trh\u00e1n\u00ed. D\u00edky sv\u00e9mu zjednodu\u0161en\u00e9mu nastaven\u00ed je tato metoda b\u011b\u017enou volbou pro rutinn\u00ed testov\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Metoda trh\u00e1n\u00ed jazyka<\/h3>\n\n\n\n<p>V situac\u00edch, kdy se tkaniny p\u0159ed roztr\u017een\u00edm neshrnou, poskytuje metoda trh\u00e1n\u00ed jazykem vy\u0161\u0161\u00ed p\u0159esnost. P\u0159edst\u0159i\u017een\u00fd vzorek se nat\u00e1hne ve dvou sm\u011brech, \u010d\u00edm\u017e se vytvo\u0159\u00ed dva \u201cjazyky\u201d. S\u00edla pot\u0159ebn\u00e1 k pokra\u010dov\u00e1n\u00ed trh\u00e1n\u00ed se zaznamen\u00e1v\u00e1 po celou dobu zkou\u0161ky. Tato metoda je zvl\u00e1\u0161t\u011b u\u017eite\u010dn\u00e1 p\u0159i anal\u00fdze vyztu\u017een\u00fdch tkanin nebo potahovan\u00fdch textili\u00ed pou\u017e\u00edvan\u00fdch v n\u00e1ro\u010dn\u00fdch aplikac\u00edch.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pevnost tkaniny v tahu: Po\u017eadavky na vzorek<\/h2>\n\n\n\n<p><strong>Pevnost tkaniny p\u0159i roztr\u017een\u00ed<\/strong> testov\u00e1n\u00ed vy\u017eaduje p\u0159esn\u011b p\u0159ipraven\u00e9 vzorky, aby byla zaji\u0161t\u011bna platnost v\u00fdsledk\u016f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>B\u011b\u017en\u011b se pou\u017e\u00edvaj\u00ed obd\u00e9ln\u00edky o rozm\u011brech 76 \u00d7 203 mm.<\/li>\n\n\n\n<li>Mus\u00ed b\u00fdt zkou\u0161eno p\u011bt vzork\u016f ve sm\u011bru osnovy a p\u011bt vzork\u016f ve sm\u011bru v\u00fdpln\u011b.<\/li>\n\n\n\n<li>\u017d\u00e1dn\u00e9 dva vzorky by nem\u011bly obsahovat identick\u00e9 p\u0159\u00edze, aby nedoch\u00e1zelo k interferenci nebo opakov\u00e1n\u00ed \u00fadaj\u016f.<\/li>\n\n\n\n<li>Kontrolovan\u00fd \u0159ez o d\u00e9lce 76 mm tvo\u0159\u00ed inicia\u010dn\u00ed bod trh\u00e1n\u00ed.<\/li>\n<\/ul>\n\n\n\n<p>P\u0159\u00edsn\u00e9 dodr\u017eov\u00e1n\u00ed pravidel p\u0159\u00edpravy zaji\u0161\u0165uje opakovatelnost a srovnatelnost mezi jednotliv\u00fdmi zku\u0161ebn\u00edmi \u0161ar\u017eemi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Trap\u00e9zov\u00e1 zkou\u0161ka pevnosti vyztu\u017een\u00fdch tkanin v roztr\u017een\u00ed<\/h2>\n\n\n\n<p>Mnoho potahovan\u00fdch tkanin vy\u017eaduje <strong>trap\u00e9zov\u00e1 zkou\u0161ka pevnosti v tahu<\/strong> proto\u017ee l\u00e9pe simuluje v\u00edcesm\u011brn\u00e9 zat\u00ed\u017een\u00ed. Zna\u010dka ve tvaru lichob\u011b\u017en\u00edku a p\u0159ed\u0159ez pom\u00e1haj\u00ed soust\u0159edit nap\u011bt\u00ed do kontrolovan\u00e9 oblasti.<\/p>\n\n\n\n<p>P\u0159i tomto postupu:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vzorky maj\u00ed rozm\u011bry 76 \u00d7 152 mm.<\/li>\n\n\n\n<li>\u0158ez o d\u00e9lce 15,9 mm iniciuje trh\u00e1n\u00ed.<\/li>\n\n\n\n<li>Strany lichob\u011b\u017en\u00edku jsou upnuty tak, aby na n\u011b p\u016fsobila rovnom\u011brn\u00e1 s\u00edla.<\/li>\n\n\n\n<li>Ne\u017e tkanina dos\u00e1hne n\u00e1r\u016fstu s\u00edly 25%, m\u016f\u017ee se objevit n\u011bkolik vrchol\u016f a \u00fadol\u00ed, po kter\u00fdch se po\u0159izuj\u00ed v\u00fdsledky.<\/li>\n<\/ul>\n\n\n\n<p>Tato metoda zachycuje nepravideln\u00e9 chov\u00e1n\u00ed p\u0159i trh\u00e1n\u00ed, kter\u00e9 je typick\u00e9 pro povrstven\u00e9 a vrstven\u00e9 tkaniny.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zku\u0161ebn\u00ed metoda pevnosti tkaniny v roztr\u017een\u00ed a v\u00fdb\u011br zku\u0161ebn\u00edho za\u0159\u00edzen\u00ed<\/h2>\n\n\n\n<p>V\u00fdb\u011br vhodn\u00e9ho <strong>metoda zkou\u0161ky pevnosti tkaniny v roztr\u017een\u00ed<\/strong> z\u00e1vis\u00ed na konstrukci tkaniny, vlastnostech povlaku a po\u017eadavc\u00edch na v\u00fdkon. P\u0159esnost v\u00fdsledk\u016f tak\u00e9 do zna\u010dn\u00e9 m\u00edry z\u00e1vis\u00ed na zku\u0161ebn\u00edm za\u0159\u00edzen\u00ed.<\/p>\n\n\n\n<p>Pro ASTM D751 by m\u011bl zku\u0161ebn\u00ed stroj spl\u0148ovat p\u0159\u00edsn\u00e9 po\u017eadavky na:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Velikost \u010delist\u00ed (25 \u00d7 50 mm nebo v\u011bt\u0161\u00ed)<\/li>\n\n\n\n<li>Rovnom\u011brn\u00e1 rychlost up\u00edn\u00e1n\u00ed (0,85 mm\/s nebo 5 mm\/s v z\u00e1vislosti na metod\u011b).<\/li>\n\n\n\n<li>Stabiln\u00ed uchopen\u00ed bez prokluzov\u00e1n\u00ed<\/li>\n\n\n\n<li>Vhodn\u00e1 nosnost (s\u00edla by se m\u011bla pohybovat v rozmez\u00ed 15% a\u017e 85% kapacity stupnice).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Doporu\u010den\u00e9 vybaven\u00ed: Cell Instruments TST-01 Tahov\u00e1 zkou\u0161e\u010dka<\/h3>\n\n\n\n<p>Na str\u00e1nk\u00e1ch <strong>TST-01 Tahov\u00e1 zkou\u0161e\u010dka<\/strong> poskytuje spolehliv\u00e9 \u0159e\u0161en\u00ed pro testov\u00e1n\u00ed trh\u00e1n\u00ed podle normy ASTM D751. D\u00edky stabiln\u00edmu syst\u00e9mu \u0159\u00edzen\u00e9mu PLC, p\u0159esn\u00e9mu kuli\u010dkov\u00e9mu \u0161roubu, \u0161irok\u00e9mu rozsahu rychlost\u00ed (1-500 mm\/min) a kompatibilit\u011b s p\u0159\u00edpravky pro testov\u00e1n\u00ed trh\u00e1n\u00ed je ide\u00e1ln\u00ed volbou jak pro laborato\u0159e v\u00fdzkumu a v\u00fdvoje, tak pro v\u00fdrobn\u00ed t\u00fdmy kontroly kvality. Zobrazen\u00ed k\u0159ivky v re\u00e1ln\u00e9m \u010dase, v\u00fdjime\u010dn\u00e1 p\u0159esnost posunut\u00ed a flexibiln\u00ed mo\u017enosti v\u00fdstupu dat pom\u00e1haj\u00ed u\u017eivatel\u016fm z\u00edskat p\u0159esn\u00e9 a sledovateln\u00e9 v\u00fdsledky.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zkou\u0161ka trh\u00e1n\u00ed tkaniny: Praktick\u00e9 vyu\u017eit\u00ed v pr\u016fmyslu<\/h2>\n\n\n\n<p>P\u0159i prov\u00e1d\u011bn\u00ed <strong>zkou\u0161ka trh\u00e1n\u00ed tkaniny<\/strong>, u\u017eivatel\u00e9 maj\u00ed prosp\u011bch z jasn\u00e9ho p\u0159ehledu o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jak p\u0159ilnavost povlaku ovliv\u0148uje \u0161\u00ed\u0159en\u00ed trhliny<\/li>\n\n\n\n<li>Jak struktura tkaniny m\u011bn\u00ed sm\u011br trh\u00e1n\u00ed<\/li>\n\n\n\n<li>Zda v\u00fdrobn\u00ed vady zp\u016fsobuj\u00ed sn\u00ed\u017eenou odolnost proti roztr\u017een\u00ed<\/li>\n\n\n\n<li>zda vstupn\u00ed materi\u00e1ly spl\u0148uj\u00ed specifikace z\u00e1kazn\u00edka<\/li>\n<\/ul>\n\n\n\n<p>S rostouc\u00ed popt\u00e1vkou po pevn\u011bj\u0161\u00edch a odoln\u011bj\u0161\u00edch potahovan\u00fdch textili\u00edch se pr\u016fmyslov\u00e1 odv\u011btv\u00ed spol\u00e9haj\u00ed na normu ASTM D751 jako na m\u011b\u0159\u00edtko pro zaji\u0161t\u011bn\u00ed kvality.<\/p>","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":true},"standard-category":[2],"class_list":["post-706","standard","type-standard","status-publish","hentry","standard-category-astm"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard\/706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/types\/standard"}],"wp:attachment":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/media?parent=706"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard-category?post=706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}