{"id":1442,"date":"2026-03-02T09:27:03","date_gmt":"2026-03-02T08:27:03","guid":{"rendered":"https:\/\/glassfiber.wpenginepowered.com\/?post_type=fagartikler&#038;p=1442"},"modified":"2026-05-13T12:27:12","modified_gmt":"2026-05-13T10:27:12","slug":"alagsreiknivel","status":"publish","type":"fagartikler","link":"https:\/\/glassfiber.no\/is\/fagartikler\/lastkalkulator\/","title":{"rendered":"Hvernig \u00e1 a\u00f0 nota \u00e1lagsreikniv\u00e9lina okkar"},"content":{"rendered":"<div class=\"wp-block-group alignwide\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\"><strong>\u00de\u00fa \u00fearft ekki a\u00f0 vera st\u00e6r\u00f0fr\u00e6\u00f0is\u00e9rfr\u00e6\u00f0ingur til a\u00f0 nota okkar <a href=\"https:\/\/glassfiber.no\/is\/alagsreiknivel\/\" type=\"page\" id=\"2878\">\u00e1lagsreikniv\u00e9l<\/a>.<br>\u00deessi handb\u00f3k mun hj\u00e1lpa \u00fe\u00e9r a\u00f0 byrja svo \u00fe\u00fa getir reikna\u00f0 \u00fat hva\u00f0a st\u00e6r\u00f0ir \u00fe\u00fa \u00fearft fyrir verkefni\u00f0 \u00feitt.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-luminous-vivid-amber-color has-alpha-channel-opacity has-luminous-vivid-amber-background-color has-background\"\/>\n\n\n\n<p class=\"has-text-align-center has-white-color has-text-color has-background has-link-color wp-elements-37a6fd3d048581fe5b3f319c3b31e154 wp-block-paragraph\" style=\"background-color:#f7b233\"><strong>Athugi\u00f0: Vinsamlegast athugi\u00f0 a\u00f0 ni\u00f0ursta\u00f0a styrk\u00fatreikningsins \u00e1 a\u00f0eins vi\u00f0 um vali\u00f0 sni\u00f0. \u00deegar bur\u00f0arvirki me\u00f0 mismunandi sni\u00f0um eru m\u00e6ld ver\u00f0ur a\u00f0 framkv\u00e6ma styrk\u00fatreikning fyrir allt bur\u00f0arvirki\u00f0.<\/strong><\/p>\n<\/div><\/div>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1366\" height=\"911\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/Glassfiber_Produkter_2020-7917-1366x911.jpg\" alt=\"\" class=\"wp-image-1447\" srcset=\"https:\/\/glassfiber.no\/wp-content\/uploads\/Glassfiber_Produkter_2020-7917-1366x911.jpg 1366w, https:\/\/glassfiber.no\/wp-content\/uploads\/Glassfiber_Produkter_2020-7917-768x512.jpg 768w, https:\/\/glassfiber.no\/wp-content\/uploads\/Glassfiber_Produkter_2020-7917-scaled.jpg 1920w\" sizes=\"auto, (max-width: 1366px) 100vw, 1366px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Ger\u00f0u g\u00f3\u00f0ar \u00e1kvar\u00f0anir fyrir verkefni\u00f0 \u00feitt<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c1lagsreikniv\u00e9lin okkar er h\u00f6nnu\u00f0 til a\u00f0 veita \u00fe\u00e9r \u00fe\u00e6r uppl\u00fdsingar sem \u00fe\u00fa \u00fearft til a\u00f0 taka g\u00f3\u00f0a \u00e1kv\u00f6r\u00f0un \u00feegar kemur a\u00f0 st\u00e6r\u00f0 verkefnisins.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reikniv\u00e9lin gerir \u00fe\u00e9r kleift a\u00f0 pr\u00f3fa \u00f6ll bur\u00f0arvirkissni\u00f0 okkar \u00ed fj\u00f6lbreyttum notkunartilvikum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00de\u00fa velur st\u00e6r\u00f0ir pr\u00f3f\u00edlsins og \u00e1lagsskilyr\u00f0in sem \u00fe\u00fa vilt taka tillit til.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A\u00f0 skilja \u00e1lagsreikniv\u00e9lina<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Val \u00e1 pr\u00f3f\u00edl<\/strong><br>H\u00e9r velur \u00fe\u00fa \u00fe\u00e1 tegund pr\u00f3f\u00edls sem \u00fe\u00fa vilt greina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. St\u00e6r\u00f0<\/strong><br>H\u00e9r velur \u00fe\u00fa st\u00e6r\u00f0ir valinnar pr\u00f3f\u00edlger\u00f0ar. M\u00e1l eru gefin upp \u00ed mm sem H-h\u00e6\u00f0, B-breidd og T-\u00feykkt. \u00cd valmyndinni eru tilt\u00e6kir og lagerpr\u00f3f\u00edlar okkar taldir upp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. E-stu\u00f0ull (MPa)<\/strong><br>E-stu\u00f0ullinn (MPa) er eining teygjanleika sem l\u00fdsir st\u00edfleika sni\u00f0sins. Fyrir trefjaplastsni\u00f0 okkar ver\u00f0ur st\u00edfleikinn 24000 MPa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Hla\u00f0a pr\u00f3f\u00edl<\/strong><br>H\u00e9r velur \u00fe\u00fa hvernig \u00e1lagi\u00f0 \u00e1 a\u00f0 dreifast \u00e1 pr\u00f3f\u00edlinn. Eftirfarandi valm\u00f6guleikar eru \u00ed bo\u00f0i:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c1lagstilfelli 1 \u2013 \u00e1lag beitt \u00ed Newton (N), sem einbeitt \u00e1lag \u00ed mi\u00f0ju pr\u00f3f\u00edlsins sem er klemmt \u00ed b\u00e1\u00f0a enda.<\/li>\n\n\n\n<li>\u00c1lagstilfelli 2 \u2013 \u00e1lag beitt jafnt dreift yfir allt pr\u00f3f\u00edlinn \u00ed nj\u00fatonum \u00e1 metra (N\/m) \u00e1 pr\u00f3f\u00edl sem er strekkt \u00ed b\u00e1\u00f0a enda.<\/li>\n\n\n\n<li>\u00c1lagstilfelli 3 \u2013 \u00e1lag beitt \u00ed Newton (N), sem einbeitt \u00e1lag \u00e1 enda pr\u00f3f\u00edlsins sem er spennt \u00e1 gagnst\u00e6\u00f0a endanum.<\/li>\n\n\n\n<li>\u00c1lagstilfelli 4 \u2013 \u00e1lag beitt jafnt dreift yfir allt pr\u00f3f\u00edlinn \u00ed nj\u00fatonum \u00e1 metra (N\/m) \u00e1 pr\u00f3f\u00edl sem er strekkt \u00ed \u00f6\u00f0rum endanum.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5. \u00de\u00e9ttleiki (g\/cm3)<br><\/strong>\u00de\u00e9ttleiki (g\/cm\u00b3) er e\u00f0lis\u00feyngd efnisins, \u00feyngd \u00e1 r\u00famm\u00e1l. \u00deetta gildi er fyrirfram fyllt me\u00f0 1,8 g\/cm\u00b3 (1800 kg\/m\u00b3) sem \u00e1 vi\u00f0 um sni\u00f0 sem framleidd eru me\u00f0 \u00fev\u00ed a\u00f0 draga sni\u00f0i\u00f0 \u00ed gegnum m\u00f3tunart\u00f3l (p\u00faltr\u00fa\u00f0u).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>6. Lengd (m)<\/strong><br>H\u00e9r er sleginn inn lengd pr\u00f3f\u00edlsins sem ver\u00f0ur fyrir \u00e1lagi. Fyrir \u00e1lagstilvik 1 og 2 er notu\u00f0 lengdin milli festipunkta \/ stu\u00f0nings. Fyrir \u00e1lagstilvik 3 og 4 er notu\u00f0 \u00fatstandandi lengd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>7. Dreif\u00f0 \u00e1lag (N\/m) \/ Punkt\u00e1lag (N)<br><\/strong>H\u00e9r er gefi\u00f0 upp \u00e1lagi\u00f0 sem pr\u00f3f\u00edlinn ver\u00f0ur fyrir. Fyrir jafnt dreift \u00e1lag er \u00e1lagi\u00f0 gefi\u00f0 upp \u00ed N\/m (d\u00e6mi 3.000 N\/m = 3KN\/m = u.\u00fe.b. 300 kg\/m). Fyrir \u00fe\u00e9tt \u00e1lag er \u00e1lagi\u00f0 gefi\u00f0 upp \u00ed N (d\u00e6mi 3.000 N = 3KN = u.\u00fe.b. 300 kg).<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1263\" height=\"727\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12.webp\" alt=\"\" class=\"wp-image-2052\" srcset=\"https:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12.webp 1263w, https:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12-768x442.webp 768w\" sizes=\"auto, (max-width: 1263px) 100vw, 1263px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/2024\/12\/2.jpg\" alt=\"\" class=\"wp-image-84662\" title=\"2\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/2024\/12\/3.jpg\" alt=\"\" class=\"wp-image-84664\" title=\"3\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1263\" height=\"727\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12.webp\" alt=\"\" class=\"wp-image-2052\" srcset=\"https:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12.webp 1263w, https:\/\/glassfiber.no\/wp-content\/uploads\/Screenshot-2024-12-17-at-11.49.12-768x442.webp 768w\" sizes=\"auto, (max-width: 1263px) 100vw, 1263px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ni\u00f0urst\u00f6\u00f0ur<\/strong><br>Mismunandi ni\u00f0urst\u00f6\u00f0ur munu breytast \u00ed raunt\u00edma \u00fat fr\u00e1 skilyr\u00f0unum sem \u00fe\u00fa hefur skilgreint h\u00e9r a\u00f0 ofan. Ni\u00f0urst\u00f6\u00f0urnar gefa \u00fe\u00e9r sk\u00fdra yfirs\u00fdn yfir hvernig sni\u00f0i\u00f0 heg\u00f0ar s\u00e9r undir \u00e1lagi, \u00feannig a\u00f0 \u00fe\u00fa getir meti\u00f0 hvort \u00fea\u00f0 uppfyllir kr\u00f6fur verkefnisins.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00e9r a\u00f0 ne\u00f0an finnur \u00fe\u00fa \u00fatsk\u00fdringu \u00e1 \u00f6llum ni\u00f0urst\u00f6\u00f0unum sem \u00fe\u00e9r eru kynntar.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"980\" height=\"223\" src=\"http:\/\/glassfiber.no\/wp-content\/uploads\/image.jpg\" alt=\"\" class=\"wp-image-1451\" srcset=\"https:\/\/glassfiber.no\/wp-content\/uploads\/image.jpg 980w, https:\/\/glassfiber.no\/wp-content\/uploads\/image-768x175.jpg 768w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00e1marks sveigja (mm)<br><\/strong>Reiknu\u00f0 sveigja \u00ed mm fyrir pr\u00f3f\u00edlinn (h\u00e1marksgildi). Sveigjan \u00e6tti ekki a\u00f0 vera meiri en 1:200 af lengd \u00e1lagspr\u00f3f\u00edlsins. D\u00e6mi: Me\u00f0 lengd \u00e1lagspr\u00f3f\u00edls upp \u00e1 4.000 mm (4 m) \u00e6tti sveigjan ekki a\u00f0 vera meiri en 20 mm.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00e1marks beygjuspenna (MPa)<br><\/strong>Beygjuspenna fyrir sni\u00f0 \u00ed megapask\u00f6lum (MPa) sem h\u00e1marksgildi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Breidd (mm\u00b3)<br><\/strong>Sni\u00f0stu\u00f0ull, sem l\u00fdsir vi\u00f0n\u00e1mi pr\u00f3f\u00edlsins gegn beygju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Massi (kg)<br><\/strong>\u00deyngd pr\u00f3f\u00edls gefin upp \u00ed k\u00edl\u00f3gr\u00f6mmum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00e1marks beygjum\u00f3t (Nm)<br><\/strong>Beygjum\u00f3ment sni\u00f0sins \u00ed nan\u00f3metrum (h\u00e1marksgildi).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Lenging (%)<br><\/strong>Pr\u00f3f\u00edllenging undir \u00e1lagi \u00ed pr\u00f3sentum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00cd (<\/strong><strong>mm\u2074)<br><\/strong>Treg\u00f0um\u00f3menti\u00f0, sem l\u00fdsir st\u00edfleika sni\u00f0sins vi\u00f0 beygju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Flatarm\u00e1l (mm\u00b2)<br><\/strong>\u00deversni\u00f0sflatarm\u00e1l sni\u00f0sins, flatarm\u00e1l raunverulegs skur\u00f0yfirbor\u00f0s \u00feegar sni\u00f0i\u00f0 er skori\u00f0 \u00feversum.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>D\u00e6mi<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Getur 150 mm H-bj\u00e1lki, styrktur \u00ed b\u00e1\u00f0um endum, me\u00f0 4 m opnu spanni bori\u00f0 300 kg\/m \u00e1lag (heildar\u00e1lag 4 m = 1,2 tonn)?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00cd reikniv\u00e9linni skal velja H-sni\u00f0 \u2013 Undir M\u00e1l skal velja H-bj\u00e1lka me\u00f0 H-152 mm, B-152 mm, T-6,4 mm. \u00cd \u00c1lagssni\u00f0 skal velja \u00c1lagstilfelli 2 \u2013 jafnt dreift \u00e1lag.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Undir Lengd (m) skal sl\u00e1 inn 4 m og undir Dreif\u00f0 \u00e1lag skal sl\u00e1 inn 3000 N\/m (300 kg (kp) = 2943 N).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reiknu\u00f0 sveigja: 7 mm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00e1\u00f0lag\u00f0ur h\u00e1marksfr\u00e1vik er 1:200 sem fyrir 4 metra opi\u00f0 spann gefur leyfilega h\u00e1marksfr\u00e1vik upp \u00e1 20 mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ni\u00f0ursta\u00f0a:<\/strong>&nbsp;Reiknu\u00f0 sveigja er 7 mm. R\u00e1\u00f0l\u00f6g\u00f0 h\u00e1markssveigja er 20 mm. H\u00e6gt er a\u00f0 nota 150 mm H-bj\u00e1lkann fyrir 300 kg\/m \u00e1lag.<\/p>","protected":false},"featured_media":1991,"template":"","meta":{"_acf_changed":false},"categories":[],"class_list":["post-1442","fagartikler","type-fagartikler","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hvordan bruke v\u00e5r lastkalkulator - Glassfiber Produkter<\/title>\n<meta name=\"description\" content=\"Les hvordan bruke v\u00e5r lastkalkulator\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/glassfiber.no\/is\/faglegar-greinar\/alagsreiknivel\/\" \/>\n<meta property=\"og:locale\" content=\"is_IS\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hvordan bruke v\u00e5r lastkalkulator - Glassfiber Produkter\" \/>\n<meta property=\"og:description\" content=\"Les hvordan bruke v\u00e5r lastkalkulator\" \/>\n<meta property=\"og:url\" content=\"https:\/\/glassfiber.no\/is\/faglegar-greinar\/alagsreiknivel\/\" \/>\n<meta property=\"og:site_name\" content=\"Glassfiber Produkter\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-13T10:27:12+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/glassfiber.no\/wp-content\/uploads\/Glassfiber_Produkter_2020-7917WEB.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1280\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/glassfiber.no\\\/fagartikler\\\/lastkalkulator\\\/\",\"url\":\"https:\\\/\\\/glassfiber.no\\\/fagartikler\\\/lastkalkulator\\\/\",\"name\":\"Hvordan bruke v\u00e5r lastkalkulator - 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