{"id":7051,"date":"2020-12-29T15:13:33","date_gmt":"2020-12-29T14:13:33","guid":{"rendered":"https:\/\/ecocranes.hu\/acelok-es-mas-anyagok-szakitoszilardsaga\/"},"modified":"2025-10-13T16:42:35","modified_gmt":"2025-10-13T14:42:35","slug":"acelok-es-mas-anyagok-szakitoszilardsaga","status":"publish","type":"post","link":"https:\/\/ecocranes.hu\/ro\/acelok-es-mas-anyagok-szakitoszilardsaga\/","title":{"rendered":"Rezisten\u021ba la rupere a o\u021belurilor \u0219i a altor materiale"},"content":{"rendered":"<p><strong>\u201eC\u00e2nd se rup toate funiile\u201d, se spune adesea despre acele situa\u021bii \u00een care nu mai e nimic de f\u0103cut, pentru c\u0103 am f\u0103cut tot ce se putea. Da, dar c\u00e2nd se rup toate funiile? Ba mai mult, se rup toate funiile \u00een acela\u0219i timp? Deloc. Exist\u0103 <\/strong><a href=\"https:\/\/ecocranes.hu\/ro\/a-darugyartas-alapanyaga-az-acel-i-resz\/\"><strong>care se rupe mai u\u0219or \u0219i mai greu<\/strong><\/a> <a href=\"https:\/\/ecocranes.hu\/ro\/kotozoeszkozok-lancok-kotelek-hevederek-az-emelestechnikaban\/\"><strong>fr\u00e2nghii<\/strong><\/a><strong>. Ce putem a\u0219tepta de la ele este determinat de rezisten\u021ba lor la rupere. Dup\u0103 metalurgie, pu\u021bin\u0103 mecanic\u0103.<\/strong><\/p>\n<h2>No\u021biunea de rezisten\u021b\u0103 la rupere<\/h2>\n<p>Rezisten\u021ba la rupere este un concept important \u00een \u0219tiin\u021bele inginere\u0219ti, \u00een special \u00een \u0219tiin\u021ba materialelor, ingineria mecanic\u0103 \u0219i ingineria structurilor.<\/p>\n<blockquote><p>Rezisten\u021ba la rupere este tensiunea mecanic\u0103 necesar\u0103 pentru ruperea unei fr\u00e2nghii, a unui fir, a unei grinzi de sus\u021binere sau a altui element structural similar.<\/p><\/blockquote>\n<p><strong>Unitatea sa de m\u0103sur\u0103 este Pa (pascal).<\/strong><\/p>\n<p>Rezisten\u021ba la rupere a materialului este doar<em><strong> rezisten\u021ba sa la sarcin\u0103 permanent\u0103<\/strong><\/em> precizeaz\u0103 c\u0103, \u00een cazul unei solicit\u0103ri dinamice, materialele se rup chiar \u0219i la o tensiune mult mai mic\u0103.<\/p>\n<p>Rezisten\u021ba la rupere este&nbsp;<em><strong>\u00een func\u021bie de temperatur\u0103<\/strong> <\/em>se modific\u0103 (de obicei scade); la temperaturi ridicate, sub o sarcin\u0103 constant\u0103, materialul sufer\u0103 o deformare \u00een continu\u0103 cre\u0219tere (flux permanent).<\/p>\n<p>Rezisten\u021ba la rupere \u0219i alungirea sunt <em><strong>MSZ 5360\u201371<\/strong><\/em> se stabile\u0219te conform standardului.<\/p>\n<h2>Determinarea rezisten\u021bei la rupere<\/h2>\n<p>Pentru determinarea rezisten\u021bei la rupere, s-a realizat din material, conform standardului, <em><strong>pe un corp de prob\u0103<\/strong> <\/em>se efectueaz\u0103 un test de rupere static.<\/p>\n<p>Acesta este un <em><strong>proces de distrugere<\/strong><\/em>, \u00een cadrul c\u0103reia proba de \u00eencercare, prelucrat\u0103 \u00een forma corespunz\u0103toare, este \u00eentins\u0103 treptat pe o ma\u0219in\u0103 de rupere, cu o for\u021b\u0103 de trac\u021biune constant\u0103, p\u00e2n\u0103 c\u00e2nd aceasta se rupe.<\/p>\n<pre>Pe parcursul procesului, se m\u0103soar\u0103 \u00een permanen\u021b\u0103 alungirea piesei de prelucrat \u00een func\u021bie de varia\u021bia sarcinii, ceea ce \u00eenseamn\u0103 c\u0103 for\u021ba de tragere este crescut\u0103 treptat, iar \u00een acela\u0219i timp ma\u0219ina \u00eenregistreaz\u0103<em><strong> diagrama tensiune-deforma\u021bie<\/strong><\/em>.<\/pre>\n<p>Aceast\u0103 diagram\u0103 for\u021b\u0103-deformare reprezint\u0103 unul dintre rezultatele \u00eencerc\u0103rii de rupere, care&nbsp;<strong>diagrama de rupere<\/strong>se nume\u0219te. \u00cen acest proces, alungirea \u0219i ruperea pot fi urm\u0103rite \u0219i \u00eemp\u0103r\u021bite \u00een etape.<\/p>\n<ul>\n<li>Prima etap\u0103 este <strong>etapa de deformare elastic\u0103<\/strong>. \u00cen aceast\u0103 faz\u0103 nu are loc \u00eenc\u0103 nicio deformare care s\u0103 \u00eempiedice proba s\u0103-\u0219i rec\u00e2\u0219tige forma ini\u021bial\u0103.<\/li>\n<li>A doua etap\u0103 este <strong>deformare uniform\u0103<\/strong>. \u00cen acest moment, deformarea plastic\u0103 este identic\u0103 pe toat\u0103 lungimea probei de trac\u021biune.<\/li>\n<li>A treia etap\u0103 este <strong style=\"font-family: inherit;\">contrac\u021bie<\/strong>, c\u00e2nd, la un moment dat, e\u0219antionul se \u00eengusteaz\u0103, iar apoi se rupe chiar acolo.<\/li>\n<\/ul>\n<h2>Legea lui Hooke<\/h2>\n<p>Legea lui Hooke este o lege care se refer\u0103 la rela\u021bia dintre deforma\u021biile elastice ale corpurilor solide \u0219i for\u021bele sau tensiunile care le produc, conform c\u0103reia <em><strong>gradul de deformare elastic\u0103, \u00een cadrul unei anumite limite (limita de elasticitate), este propor\u021bional cu for\u021ba care o produce<\/strong><\/em>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-1024x768.png\" alt=\"ac\u00e9ll\u00e1nc szakad\u00e1s\" srcset=\"https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-1024x768.png 1024w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-300x225.png 300w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-768x576.png 768w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-560x420.png 560w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-100x76.png 100w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-270x203.png 270w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-370x278.png 370w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-420x316.png 420w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-480x361.png 480w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-570x428.png 570w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-770x578.png 770w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-400x300.png 400w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280-900x675.png 900w, https:\/\/ecocranes.hu\/wp-content\/uploads\/2020\/12\/25_chain-297842_1280.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\"><\/p>\n<h2>Tensiuni importante care pot fi m\u0103surate<\/h2>\n<p>\u00cen cazul degrad\u0103rii materialelor cauzate de o sarcin\u0103 constant\u0103, trebuie luate \u00een considerare trei tipuri importante de tensiuni:<\/p>\n<ul>\n<li><strong>Limita de curgere<\/strong>&nbsp;<strong>(R<sub>e<\/sub>)<\/strong>: tensiunea pe care materialul o suport\u0103 f\u0103r\u0103 a suferi o deformare permanent\u0103. Acest punct nu poate fi \u00eentotdeauna determinat cu precizie, de aceea, \u00een cazul anumitor materiale, se ia \u00een considerare \u00een schimb tensiunea <em><strong>limita de curgere<\/strong><\/em>, la care gradul de deformare permanent\u0103 este de 0,2%. Sub limita de curgere, orice deformare este reversibil\u0103. Dincolo de limita de curgere, materialul sufer\u0103 o deformare permanent\u0103 (\u00een cazul o\u021belului, alungire).<\/li>\n<li><strong>Rezisten\u021ba la rupere<\/strong>&nbsp;<strong>(R<sub>m<\/sub>)<\/strong>: tensiunea maxim\u0103 pe care materialul o poate suporta f\u0103r\u0103 a se rupe sau, altfel spus, valoarea care <em><strong>punctul de for\u021b\u0103 maxim\u0103 al diagramei de rupere<\/strong><\/em> \u0219i raportul dintre sec\u021biunile transversale ale e\u0219antionului.<\/li>\n<li><strong>Ruptur\u0103<\/strong>: se poate citi din diagrama de rupere <em><strong>tensiune<\/strong><\/em>, acolo unde materialul se rupe.<\/li>\n<\/ul>\n<p><em><strong>Curiozitate<\/strong><\/em>, \u00eentruc\u00e2t materialele rigide nu au limit\u0103 de curgere \u0219i nici faz\u0103 de \u00eent\u0103rire; \u00een cazul acestora, tensiunea maxim\u0103 \u0219i rezisten\u021ba la rupere sunt egale.<\/p>\n<pre>Dac\u0103 metalele <a href=\"https:\/\/ecocranes.hu\/ro\/a-darugyartas-alapanyaga-az-acel-iv-resz\/\">prelucrare la rece<\/a> dac\u0103 sunt supuse la for\u021be de \u00eencovoiere sau dac\u0103 li se trage un fir din ele, rezisten\u021ba lor la rupere cre\u0219te.<\/pre>\n<h2>Valorile tipice ale rezisten\u021bei unor materiale<\/h2>\n<p>\u00cen tabelul de mai jos am prezentat, cu titlu informativ, valorile caracteristice ale rezisten\u021bei unor materiale.<\/p>\n<table>\n<thead>\n<tr>\n<td><strong><em>Denumirea materialului<\/em><\/strong><\/td>\n<td><strong><em>Limita de curgere (MPa)<\/em><\/strong><\/td>\n<td><strong><em>Tensiunea maxim\u0103 (MPa)<\/em><\/strong><\/td>\n<td><strong><em>Densitate (g\/cm\u00b3)<\/em><\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Structurale&nbsp;<a href=\"https:\/\/ecocranes.hu\/ro\/a-darugyartas-alapanyaga-az-acel-ii-resz\/\">o\u021bel<\/a>&nbsp;A36<\/td>\n<td>250<\/td>\n<td>400<\/td>\n<td>7,8<\/td>\n<\/tr>\n<tr>\n<td>De \u00eenalt\u0103 rezisten\u021b\u0103 <a href=\"https:\/\/ecocranes.hu\/ro\/a-darugyartas-alapanyaga-az-acel-iii-resz\/\">alegat<\/a> o\u021bel A514<\/td>\n<td>690<\/td>\n<td>760<\/td>\n<td>7,8<\/td>\n<\/tr>\n<tr>\n<td>S\u00e2rm\u0103 de o\u021bel pretensionat\u0103 de \u00eenalt\u0103 rezisten\u021b\u0103<\/td>\n<td>1650<\/td>\n<td>1860<\/td>\n<td>7,8<\/td>\n<\/tr>\n<tr>\n<td>Coard\u0103 de pian (o\u021bel)<\/td>\n<td>aprox. 2000<\/td>\n<td>&nbsp;<\/td>\n<td>7,8<\/td>\n<\/tr>\n<tr>\n<td>Polietilen\u0103 de \u00eenalt\u0103 densitate (HDPE)<\/td>\n<td>26-33<\/td>\n<td>37<\/td>\n<td>0,95<\/td>\n<\/tr>\n<tr>\n<td>Polipropilen\u0103<\/td>\n<td>12-43<\/td>\n<td>19,7-80<\/td>\n<td>0,91<\/td>\n<\/tr>\n<tr>\n<td>O\u021bel rezistent la coroziune AISI 302 \u2013 (laminat la rece)<\/td>\n<td>520<\/td>\n<td>860<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/ecocranes.hu\/ro\/a-darugyartas-alapanyaga-az-acel-i-resz\/\">Fonta turnat\u0103<\/a>&nbsp;4,5% C, ASTM A-48<\/td>\n<td>130<\/td>\n<td>200<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>Aliaj de titan (6% Al, 4% V)<\/td>\n<td>830<\/td>\n<td>900<\/td>\n<td>4,51<\/td>\n<\/tr>\n<tr>\n<td>Sticl\u0103<\/td>\n<td>&nbsp;<\/td>\n<td>50 (la ap\u0103sare)<\/td>\n<td>2,53<\/td>\n<\/tr>\n<tr>\n<td>Marmur\u0103<\/td>\n<td>N\/A<\/td>\n<td>15<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>Beton<\/td>\n<td>N\/A<\/td>\n<td>2-5 (la tragere)<br \/>\n(6)-20-60-(200) (la presiune)<\/td>\n<td>2,4<\/td>\n<\/tr>\n<tr>\n<td>M\u0103tase de omid\u0103<\/td>\n<td>500<\/td>\n<td>&nbsp;<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>Os<\/td>\n<td>&nbsp;<\/td>\n<td>130<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>Exist\u0103 fr\u00e2nghii care se rup mai u\u0219or \u0219i altele care se rup mai greu. Ce putem a\u0219tepta de la ele este determinat de rezisten\u021ba lor la rupere.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[144,102],"tags":[145,118],"class_list":["post-7051","post","type-post","status-publish","format-standard","hentry","category-hasznos-tudas","category-hirek-cikkek","tag-acel","tag-darugyartas","no-thumb"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ac\u00e9lok \u00e9s m\u00e1s anyagok szak\u00edt\u00f3szil\u00e1rds\u00e1ga - Eco-Cranes<\/title>\n<meta name=\"description\" content=\"Vannak k\u00f6nnyebben \u00e9s nehezebben szakad\u00f3 k\u00f6telek. 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