{"id":603,"date":"2018-10-17T00:14:55","date_gmt":"2018-10-16T16:14:55","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=603"},"modified":"2018-10-17T00:14:55","modified_gmt":"2018-10-16T16:14:55","slug":"chapter-25-1-residual-stress","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/da\/2018\/10\/17\/kapitel-25-1-restspaending\/","title":{"rendered":"Kapitel 25-1, Restsp\u00e6nding"},"content":{"rendered":"<h1>En synder i problemer med krympning og sk\u00e6vvridning<\/h1>\n<p>Restsp\u00e6nding er en procesinduceret sp\u00e6nding, der er fastfrosset i en st\u00f8bt del. Den kan enten v\u00e6re flowinduceret eller termisk induceret. Restsp\u00e6ndinger p\u00e5virker en del p\u00e5 samme m\u00e5de som eksternt p\u00e5f\u00f8rte sp\u00e6ndinger. Hvis de er st\u00e6rke nok til at overvinde emnets strukturelle integritet, vil emnet vride sig ved udst\u00f8dning eller senere revne, n\u00e5r det uds\u00e6ttes for ekstern belastning. Restsp\u00e6ndinger er hoved\u00e5rsagen til emnets krympning og forvridning. De procesbetingelser og designelementer, der reducerer forskydningssp\u00e6ndingen under fyldning af hulrummet, vil hj\u00e6lpe med at reducere flowinduceret restsp\u00e6nding. Ligeledes vil de, der fremmer tilstr\u00e6kkelig pakning og ensartet formk\u00f8ling, reducere termisk induceret restsp\u00e6nding. For fiberfyldte materialer vil de procesbetingelser, der fremmer ensartede mekaniske egenskaber, reducere varmeinduceret restsp\u00e6nding.\u00a0<a title=\"Leverand\u00f8r af skimmelsvamp i Kina\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Leverand\u00f8r af skimmelsvamp i Kina<\/a><\/p>\n<h1>Flow-induceret restsp\u00e6nding<\/h1>\n<p>Ubelastede, langk\u00e6dede polymermolekyler har en tendens til at tilpasse sig en ligev\u00e6gtstilstand med tilf\u00e6ldige spoler ved temperaturer, der er h\u00f8jere end smeltetemperaturen (dvs. i smeltet tilstand). Under bearbejdningen orienterer molekylerne sig i str\u00f8mningsretningen, n\u00e5r polymeren forskydes og forl\u00e6nges. Hvis st\u00f8rkningen sker, f\u00f8r polymermolekylerne er helt afslappede til deres ligev\u00e6gtstilstand, er molekyl\u00e6r orientering l\u00e5st inden for<br \/>\nst\u00f8bte del. Denne type fastfrosset sp\u00e6ndingstilstand kaldes ofte for flowinduceret restsp\u00e6nding. P\u00e5 grund af den strakte molekyl\u00e6re orientering i str\u00f8mningsretningen introducerer den anisotropisk, uensartet svind og mekaniske egenskaber i retningerne parallelt og vinkelret p\u00e5 str\u00f8mningsretningen.<\/p>\n<h2>Indfrosset molekyl\u00e6r orientering<\/h2>\n<p>P\u00e5 grund af en kombination af h\u00f8j forskydningssp\u00e6nding og en h\u00f8j afk\u00f8lingshastighed ved siden af formv\u00e6ggen er der et st\u00e6rkt orienteret lag, der er frosset umiddelbart under emnets overflade. Dette er illustreret i figur 1. N\u00e5r et emne med h\u00f8je reststr\u00f8mningssp\u00e6ndinger (eller fastfrosset orientering) efterf\u00f8lgende uds\u00e6ttes for h\u00f8j temperatur, kan nogle af sp\u00e6ndingerne slippe op. Dette resulterer typisk i krympning og sk\u00e6vvridning af emnet. P\u00e5 grund af de frosne lags varmeisolerende effekt kan polymersmelten i den varme kerne slappe af i h\u00f8jere grad, hvilket f\u00f8rer til en zone med lav molekyl\u00e6r orientering.\u00a0<a title=\"Leverand\u00f8r af skimmelsvamp i Kina\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Leverand\u00f8r af skimmelsvamp i Kina<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Frosset i molekyl\u00e6r orientering\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Frosset i molekyl\u00e6r orientering\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>FIGUR 1.<\/strong>\u00a0Udviklingen af reststr\u00f8mningssp\u00e6ndinger p\u00e5 grund af fastfrosset molekyl\u00e6r orientering under p\u00e5fyldnings- og pakningsfaserne.<br \/>\n(1) H\u00f8j k\u00f8le-, forskydnings- og orienteringszone (2) Lav k\u00f8le-, forskydnings- og orienteringszone<\/p>\n<h2>Reduktion af flow-induceret restsp\u00e6nding<\/h2>\n<p>Procesbetingelser, der reducerer forskydningssp\u00e6ndingen i smelten, vil reducere niveauet af flowinducerede restsp\u00e6ndinger. Generelt er flowinduceret restsp\u00e6nding en st\u00f8rrelsesorden mindre end den termisk inducerede restsp\u00e6nding.\u00a0<a title=\"Leverand\u00f8r af skimmelsvamp i Kina\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Leverand\u00f8r af skimmelsvamp i Kina<\/a><\/p>\n<ul>\n<li>h\u00f8jere smeltetemperatur<\/li>\n<li>h\u00f8jere temperatur p\u00e5 formv\u00e6ggen<\/li>\n<li>l\u00e6ngere fyldetid (lavere smeltehastighed)<\/li>\n<li>nedsat pakningstryk<\/li>\n<li>kortere flowvej.<\/li>\n<\/ul>\n<h1>\u00a0Termisk induceret restsp\u00e6nding<\/h1>\n<p>Termisk induceret restsp\u00e6nding opst\u00e5r af f\u00f8lgende \u00e5rsager:<\/p>\n<ul>\n<li>Materialet krymper, n\u00e5r temperaturen falder fra procesindstillingerne til de omgivende forhold, der opn\u00e5s, n\u00e5r processen er f\u00e6rdig.<\/li>\n<li>Materialeelementerne oplever forskellige termisk-mekaniske forl\u00f8b (f.eks. forskellige k\u00f8lehastigheder og pakningstryk), n\u00e5r materialet st\u00f8rkner fra formv\u00e6ggen til midten.<\/li>\n<li>\u00c6ndret tryk, temperatur og molekyl\u00e6r- og fiberorientering resulterer i varierende t\u00e6thed og mekaniske egenskaber.<\/li>\n<li>Visse formbegr\u00e6nsninger forhindrer den st\u00f8bte del i at krympe i de plane retninger.<\/li>\n<\/ul>\n<h2>Eksempel p\u00e5 fri slukning<\/h2>\n<p>Materialekrympning under spr\u00f8jtest\u00f8bning kan nemt demonstreres med et eksempel p\u00e5 fri slukning, hvor en del med ensartet temperatur pludselig bliver klemt inde mellem kolde formv\u00e6gge. I de tidlige afk\u00f8lingsfaser, n\u00e5r de ydre overfladelag afk\u00f8les og begynder at krympe, er st\u00f8rstedelen af polymeren i den varme kerne stadig smeltet og kan frit tr\u00e6kke sig sammen. Men n\u00e5r den indre kerne afk\u00f8les, begr\u00e6nses den lokale termiske sammentr\u00e6kning af de allerede stive ydre lag. Det resulterer i en typisk sp\u00e6ndingsfordeling med sp\u00e6nding i kernen afbalanceret af kompression i de ydre lag, som illustreret i figur 2 nedenfor.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1304\" title=\"Fri-slukning-eksempel\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Free-quenching-example.gif\" alt=\"Fri-slukning-eksempel\" width=\"579\" height=\"258\" \/><\/p>\n<p><strong>FIGUR 2.<\/strong>\u00a0Udviklingen af termisk restsp\u00e6nding i en \"frih\u00e6rdende\" del p\u00e5 grund af variationer i afk\u00f8ling p\u00e5 tv\u00e6rs af den st\u00f8bte del og materialets reaktion p\u00e5 temperaturforl\u00f8bet.<\/p>","protected":false},"excerpt":{"rendered":"<p>En synder i problemer med krympning og sk\u00e6vvridning Restsp\u00e6nding er en procesinduceret sp\u00e6nding, der er fastfrosset i en st\u00f8bt del. Den kan enten v\u00e6re flowinduceret eller termisk induceret. Restsp\u00e6ndinger p\u00e5virker en del p\u00e5 samme m\u00e5de som eksternt p\u00e5f\u00f8rte sp\u00e6ndinger. Hvis de er st\u00e6rke nok til at overvinde emnets strukturelle integritet, vil emnet blive sk\u00e6vt ved udst\u00f8dning eller senere [...].<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-603","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.plasticmoldco.com\/da\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"A culprit in shrinkage and warpage problems Residual stress is a process-induced stress, frozen in a molded part. 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It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. 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