{"id":589,"date":"2026-02-26T05:44:05","date_gmt":"2026-02-26T05:44:05","guid":{"rendered":"https:\/\/www.teartester.com\/?post_type=method&p=589"},"modified":"2026-02-27T08:59:17","modified_gmt":"2026-02-27T08:59:17","slug":"tear-strength-test","status":"publish","type":"method","link":"https:\/\/www.teartester.com\/sk\/method\/tear-strength-test\/","title":{"rendered":"Sk\u00fa\u0161ka pevnosti v \u0165ahu"},"content":{"rendered":"

Z\u00e1sady testovania definovan\u00e9 v norme ASTM D624<\/h2>\n\n\n\n

ASTM D624<\/a> opisuje pevnos\u0165 v roztrhnut\u00ed ako maxim\u00e1lnu silu potrebn\u00fa na pretrhnutie, inici\u00e1ciu alebo \u0161\u00edrenie trhliny vydelen\u00fa hr\u00fabkou vzorky. Po\u010das sk\u00fa\u0161ky sa na sk\u00fa\u0161obnom zariaden\u00ed na pevnos\u0165 v \u0165ahu pou\u017e\u00edva kon\u0161tantn\u00e1 r\u00fdchlos\u0165 kr\u00ed\u017eovej hlavy, a\u017e k\u00fdm sa vzorka gumy \u00faplne neroztrhne.<\/p>\n\n\n\n

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\"Test<\/figure>\n<\/div>\n\n\n\n
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Sk\u00fa\u0161ka pevnosti v \u0165ahu pre gumu a elastom\u00e9ry<\/h2>\n\n\n\n

A sk\u00fa\u0161ka odolnosti proti roztrhnutiu<\/strong> sa na pripraven\u00fa vzorku aplikuje riaden\u00e1 \u0165ahov\u00e1 deform\u00e1cia pomocou zariadenia na sk\u00fa\u0161anie v \u0165ahu. Sk\u00fa\u0161ka pokra\u010duje a\u017e do \u00fapln\u00e9ho pretrhnutia. Ke\u010f\u017ee guma a elastom\u00e9ry vykazuj\u00fa komplexn\u00e9 deforma\u010dn\u00e9 spr\u00e1vanie, norma ASTM D624 kladie d\u00f4raz na d\u00f4sledn\u00fa pr\u00edpravu vzoriek, vyrovnanie a r\u00fdchlos\u0165 sk\u00fa\u0161ky, aby sa zabezpe\u010dila opakovate\u013enos\u0165 v\u00fdsledkov.<\/p>\n\n\n\n

Je d\u00f4le\u017eit\u00e9 poznamena\u0165, \u017ee guma a elastom\u00e9ry<\/strong> reaguj\u00fa na trhanie r\u00f4zne v z\u00e1vislosti od zlo\u017eenia, vytvrdzovania, obsahu plniva a orient\u00e1cie. Norma ASTM D624 preto definuje nieko\u013eko typov vzoriek, z ktor\u00fdch ka\u017ed\u00e1 je navrhnut\u00e1 tak, aby reprezentovala in\u00fd mechanizmus trhania, a nie jednu univerz\u00e1lnu hodnotu.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Pr\u00edprava vzoriek a sk\u00fa\u0161obn\u00fd postup<\/h2>\n\n\n\n

Presn\u00e9 testovanie odolnosti proti roztrhnutiu sa za\u010d\u00edna starostlivou pr\u00edpravou vzorky. Vzorky gumy musia ma\u0165 rovnomern\u00fa hr\u00fabku, \u010dist\u00e9 okraje a presn\u00fa geometriu. Ak\u00e1ko\u013evek nepravidelnos\u0165 m\u00f4\u017ee v\u00fdrazne ovplyvni\u0165 v\u00fdsledky sk\u00fa\u0161ky.<\/p>\n\n\n\n

Vzorku upevnite do stredov\u00fdch \u00fachytov stroja na \u0165ahov\u00e9 sk\u00fa\u0161ky a dbajte na spr\u00e1vne zarovnanie, aby ste zabr\u00e1nili p\u00f4sobeniu ohybov\u00fdch alebo kr\u00fatiacich s\u00edl. P\u00f4sobte na \u0165ahov\u00e9 za\u0165a\u017eenie pri stanovenej kon\u0161tantnej r\u00fdchlosti, k\u00fdm sa roztrhnutie neskon\u010d\u00ed. Zaznamenajte krivku sily a posunutia a identifikujte \u0161pi\u010dkov\u00e9 alebo priemern\u00e9 sily pod\u013ea zvolen\u00e9ho typu vzorky.<\/p>\n<\/div>\n\n\n\n

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\"Pr\u00edru\u010dka<\/figure>\n<\/div>\n<\/div>\n\n\n\n

Pre\u010do je testovanie pevnosti v \u0165ahu d\u00f4le\u017eit\u00e9 pri aplik\u00e1ci\u00e1ch gumy<\/h2>\n\n\n\n

V prev\u00e1dzke gumov\u00e9 v\u00fdrobky zriedkavo zlyh\u00e1vaj\u00fa len v d\u00f4sledku rovnomern\u00e9ho roztiahnutia. Namiesto toho sa porucha \u010dasto za\u010d\u00edna na ostr\u00fdch hran\u00e1ch, usaden\u00fdch \u010dasticiach alebo lokalizovan\u00fdch bodoch nam\u00e1hania. Testovanie pevnosti v roztrhnut\u00ed pom\u00e1ha in\u017einierom pochopi\u0165, ako r\u00fdchlo a \u013eahko sa m\u00f4\u017ee roztrhnutie po za\u010dat\u00ed zv\u00e4\u010d\u0161i\u0165.<\/p>\n\n\n\n

Pre t\u00edmy kontroly kvality je test pevnosti v roztrhnut\u00ed podporou pri porovn\u00e1van\u00ed materi\u00e1lov, kontrole procesov a vstupnej kontrole. Kon\u0161trukt\u00e9rom v\u00fdrobkov poskytuje preh\u013ead o vhodnosti materi\u00e1lu pre n\u00e1ro\u010dn\u00e9 aplik\u00e1cie, ako s\u00fa dynamick\u00e9 tesnenia alebo prostredia n\u00e1chyln\u00e9 na odieranie.<\/p>","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":true},"class_list":["post-589","method","type-method","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.teartester.com\/sk\/wp-json\/wp\/v2\/method\/589","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.teartester.com\/sk\/wp-json\/wp\/v2\/method"}],"about":[{"href":"https:\/\/www.teartester.com\/sk\/wp-json\/wp\/v2\/types\/method"}],"wp:attachment":[{"href":"https:\/\/www.teartester.com\/sk\/wp-json\/wp\/v2\/media?parent=589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}