{"id":3869,"date":"2026-02-18T05:50:39","date_gmt":"2026-02-18T05:50:39","guid":{"rendered":"http:\/\/www.benateckyctyrlistek.eu\/?p=3869"},"modified":"2026-02-15T19:10:55","modified_gmt":"2026-02-15T19:10:55","slug":"vlastnosti-dreva","status":"publish","type":"post","link":"https:\/\/www.benateckyctyrlistek.eu\/?p=3869","title":{"rendered":"Vlastnosti d\u0159eva – z\u00e1klad"},"content":{"rendered":"
\n

\"drevo-01\"<\/a>Barvy d\u0159eva a do ur\u010dit\u00e9 m\u00edry i jeho vlastnosti z\u00e1visej\u00ed nejen na druhu stromu, z\u00a0kter\u00e9ho ten kter\u00fd kousek d\u0159eva poch\u00e1z\u00ed, ale i na p\u016fdn\u00edch a \u017eivotn\u00edch podm\u00ednk\u00e1ch jednotliv\u00fdch strom\u016f a mohou se m\u011bnit.Tvrdost <\/strong>je schopnost materi\u00e1l\u016f kl\u00e1st odpor proti vnik\u00e1n\u00ed jin\u00fdch t\u011bles. Jist\u00fd pan Brinell tla\u010dil ur\u010ditou silou ocelovou kuli\u010dku do materi\u00e1lu. M\u00e1-li ocelov\u00e1 kuli\u010dka p\u0159edepsan\u00fd rozm\u011br, jde o tzv. Brinellovu zkou\u0161ku tvrdosti. U n\u00e1s zase pan Janka tla\u010dil do d\u0159eva razidlo, ukon\u010den\u00e9 p\u016flkuli\u010dkou. To je tzv. Jankova zkou\u0161ka. D\u0159evo je m\u011bkk\u00e9, polotvrd\u00e9, tvrd\u00e9 a velmi tvrd\u00e9. Z\u00a0na\u0161ich d\u0159ev je asi nejtvrd\u0161\u00ed habrov\u00e9 a nejm\u011bk\u010d\u00ed topolov\u00e9.<\/p>\n

Pevnost<\/strong> n\u00e1m \u0159\u00edk\u00e1, jak kter\u00e9 d\u0159evo vzdoruje statick\u00e9mu nam\u00e1h\u00e1n\u00ed. Mezi nejpevn\u011bj\u0161\u00ed pat\u0159\u00ed d\u0159evo dubov\u00e9 a ak\u00e1tov\u00e9, ale i t\u0159eba m\u011bkk\u00e9 ol\u0161ov\u00e9, pokud je trvale um\u00edst\u011bno pod vodou.<\/p>\n

Hou\u017eevnatost<\/strong> je schopnost odol\u00e1vat dynamick\u00e9mu, r\u00e1zov\u00e9mu nam\u00e1h\u00e1n\u00ed. D\u0159eva\u0159sk\u00e9 tabulky definuj\u00ed hou\u017eevnatost jako hodnotu v\u00fd\u0161ky, z\u00a0jak\u00e9 mus\u00ed spadnout kladivo t\u011b\u017ek\u00e9 1,5 kg na hranolek o pr\u016f\u0159ezu 2×2 cm, aby ho p\u0159erazilo. V\u00a0tomto sm\u011bru vynik\u00e1 svou hou\u017eevnatost\u00ed d\u0159evo dubov\u00e9.<\/p>\n

Pru\u017enost<\/strong> – tzv. modul pru\u017enosti je m\u00edrou odporu, kter\u00fd klade materi\u00e1l zat\u00ed\u017een\u00ed, je\u017e ho oh\u00fdb\u00e1. Nejpru\u017en\u011bj\u0161\u00ed z\u00a0na\u0161ich d\u0159ev je d\u0159evo jasanov\u00e9, ke k\u0159eh\u010d\u00edm pat\u0159\u00ed t\u0159eba \u0161vestkov\u00e9.<\/p>\n

Textura<\/strong> je kresba d\u0159eva, tvo\u0159\u00ed ji letokruhy, d\u0159e\u0148ov\u00e9 paprsky apod. V\u00a0ka\u017ed\u00e9m pohledu je jin\u00e1.<\/p>\n<\/div>\n

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Barvy d\u0159eva a do ur\u010dit\u00e9 m\u00edry i jeho vlastnosti z\u00e1visej\u00ed nejen na druhu stromu, z\u00a0kter\u00e9ho ten kter\u00fd kousek d\u0159eva poch\u00e1z\u00ed, ale i na p\u016fdn\u00edch a \u017eivotn\u00edch podm\u00ednk\u00e1ch jednotliv\u00fdch strom\u016f a mohou se m\u011bnit.Tvrdost je schopnost materi\u00e1l\u016f kl\u00e1st odpor proti vnik\u00e1n\u00ed jin\u00fdch t\u011bles. Jist\u00fd pan Brinell<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[8],"tags":[],"class_list":["post-3869","post","type-post","status-publish","format-standard","hentry","category-clanky"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p4YkmD-10p","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/3869","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3869"}],"version-history":[{"count":5,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/3869\/revisions"}],"predecessor-version":[{"id":4419,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=\/wp\/v2\/posts\/3869\/revisions\/4419"}],"wp:attachment":[{"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3869"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3869"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.benateckyctyrlistek.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3869"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}