{"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\/pt\/2018\/10\/17\/capitulo-25-1-tensao-residual\/","title":{"rendered":"Cap\u00edtulo 25-1, Tens\u00e3o residual"},"content":{"rendered":"<h1>Um dos culpados pelos problemas de encolhimento e empenamento<\/h1>\n<p>A tens\u00e3o residual \u00e9 uma tens\u00e3o induzida pelo processo, congelada em uma pe\u00e7a moldada. Ela pode ser induzida por fluxo ou t\u00e9rmica. As tens\u00f5es residuais afetam uma pe\u00e7a de forma semelhante \u00e0s tens\u00f5es aplicadas externamente. Se forem fortes o suficiente para superar a integridade estrutural da pe\u00e7a, ela se deformar\u00e1 ao ser ejetada ou, posteriormente, rachar\u00e1 quando for aplicada uma carga de servi\u00e7o externa. As tens\u00f5es residuais s\u00e3o a principal causa de encolhimento e empenamento da pe\u00e7a. As condi\u00e7\u00f5es do processo e os elementos do projeto que reduzem a tens\u00e3o de cisalhamento durante o preenchimento da cavidade ajudar\u00e3o a reduzir a tens\u00e3o residual induzida pelo fluxo. Da mesma forma, aqueles que promovem o acondicionamento suficiente e o resfriamento uniforme do molde reduzir\u00e3o a tens\u00e3o residual induzida pelo calor. Para materiais preenchidos com fibra, as condi\u00e7\u00f5es do processo que promovem propriedades mec\u00e2nicas uniformes reduzir\u00e3o a tens\u00e3o residual induzida pelo calor.\u00a0<a title=\"Fornecedor de moldes da China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fornecedor de moldes da China<\/a><\/p>\n<h1>Tens\u00e3o residual induzida por fluxo<\/h1>\n<p>As mol\u00e9culas de pol\u00edmero de cadeia longa n\u00e3o tensionadas tendem a se conformar a um estado de equil\u00edbrio de bobina aleat\u00f3ria em temperaturas mais altas do que a temperatura de fus\u00e3o (ou seja, em um estado fundido). Durante o processamento, as mol\u00e9culas se orientam na dire\u00e7\u00e3o do fluxo, \u00e0 medida que o pol\u00edmero \u00e9 cortado e alongado. Se a solidifica\u00e7\u00e3o ocorrer antes que as mol\u00e9culas do pol\u00edmero estejam totalmente relaxadas em seu estado de equil\u00edbrio, a orienta\u00e7\u00e3o molecular ser\u00e1 bloqueada dentro do estado de equil\u00edbrio.<br \/>\npe\u00e7a moldada. Esse tipo de estado de tens\u00e3o congelada \u00e9 geralmente chamado de tens\u00e3o residual induzida por fluxo. Devido \u00e0 orienta\u00e7\u00e3o molecular esticada na dire\u00e7\u00e3o do fluxo, ele introduz propriedades mec\u00e2nicas e de contra\u00e7\u00e3o anisotr\u00f3picas e n\u00e3o uniformes nas dire\u00e7\u00f5es paralela e perpendicular \u00e0 dire\u00e7\u00e3o do fluxo.<\/p>\n<h2>Orienta\u00e7\u00e3o molecular congelada<\/h2>\n<p>Devido a uma combina\u00e7\u00e3o de alta tens\u00e3o de cisalhamento e alta taxa de resfriamento adjacente \u00e0 parede do molde, h\u00e1 uma camada altamente orientada congelada imediatamente abaixo da superf\u00edcie da pe\u00e7a. Isso \u00e9 ilustrado na Figura 1. A exposi\u00e7\u00e3o subsequente de uma pe\u00e7a com altas tens\u00f5es de fluxo residual (ou orienta\u00e7\u00e3o congelada) a altas temperaturas pode permitir que algumas das tens\u00f5es sejam aliviadas. Isso normalmente resulta em encolhimento e empenamento da pe\u00e7a. Devido ao efeito de isolamento t\u00e9rmico das camadas congeladas, o pol\u00edmero fundido no n\u00facleo quente pode relaxar em um grau mais alto, levando a uma zona de baixa orienta\u00e7\u00e3o molecular.\u00a0<a title=\"Fornecedor de moldes da China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fornecedor de moldes da China<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Congelado em orienta\u00e7\u00e3o molecular\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Congelado em orienta\u00e7\u00e3o molecular\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>FIGURA 1.<\/strong>\u00a0O desenvolvimento de tens\u00f5es de fluxo residual devido \u00e0 orienta\u00e7\u00e3o molecular congelada durante os est\u00e1gios de enchimento e empacotamento.<br \/>\n(1) Zona de alto resfriamento, cisalhamento e orienta\u00e7\u00e3o (2) Zona de baixo resfriamento, cisalhamento e orienta\u00e7\u00e3o<\/p>\n<h2>Redu\u00e7\u00e3o da tens\u00e3o residual induzida pelo fluxo<\/h2>\n<p>As condi\u00e7\u00f5es do processo que reduzem a tens\u00e3o de cisalhamento na fus\u00e3o reduzir\u00e3o o n\u00edvel de tens\u00f5es residuais induzidas pelo fluxo. Em geral, a tens\u00e3o residual induzida pelo fluxo \u00e9 uma ordem de grandeza menor do que a tens\u00e3o residual induzida pelo calor.\u00a0<a title=\"Fornecedor de moldes da China\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fornecedor de moldes da China<\/a><\/p>\n<ul>\n<li>maior temperatura de fus\u00e3o<\/li>\n<li>maior temperatura da parede do molde<\/li>\n<li>maior tempo de preenchimento (menor velocidade de fus\u00e3o)<\/li>\n<li>diminui\u00e7\u00e3o da press\u00e3o de empacotamento<\/li>\n<li>caminho de fluxo mais curto.<\/li>\n<\/ul>\n<h1>\u00a0Tens\u00e3o residual induzida pelo calor<\/h1>\n<p>A tens\u00e3o residual induzida pelo calor ocorre devido aos seguintes motivos:<\/p>\n<ul>\n<li>O material encolhe \u00e0 medida que a temperatura cai das configura\u00e7\u00f5es do processo para as condi\u00e7\u00f5es ambientais alcan\u00e7adas quando o processo \u00e9 conclu\u00eddo.<\/li>\n<li>Os elementos do material passam por diferentes hist\u00f3ricos termomec\u00e2nicos (por exemplo, diferentes taxas de resfriamento e press\u00f5es de empacotamento) \u00e0 medida que o material se solidifica da parede do molde para o centro.<\/li>\n<li>A mudan\u00e7a de press\u00e3o, temperatura e orienta\u00e7\u00e3o molecular e das fibras resulta em densidade e propriedades mec\u00e2nicas vari\u00e1veis.<\/li>\n<li>Certas restri\u00e7\u00f5es do molde impedem que a pe\u00e7a moldada encolha nas dire\u00e7\u00f5es planas.<\/li>\n<\/ul>\n<h2>Exemplo de resfriamento livre<\/h2>\n<p>O encolhimento do material durante a moldagem por inje\u00e7\u00e3o pode ser convenientemente demonstrado com um exemplo de resfriamento livre, no qual uma pe\u00e7a de temperatura uniforme \u00e9 repentinamente ensanduichada pelas paredes frias do molde. Durante os est\u00e1gios iniciais de resfriamento, quando as camadas da superf\u00edcie externa se resfriam e come\u00e7am a encolher, a maior parte do pol\u00edmero no n\u00facleo quente ainda est\u00e1 fundida e livre para se contrair. Entretanto, \u00e0 medida que o n\u00facleo interno esfria, a contra\u00e7\u00e3o t\u00e9rmica local \u00e9 restringida pelas camadas externas j\u00e1 r\u00edgidas. Isso resulta em um estado t\u00edpico de distribui\u00e7\u00e3o de tens\u00e3o com tens\u00e3o no n\u00facleo equilibrada pela compress\u00e3o nas camadas externas, conforme ilustrado na Figura 2 abaixo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1304\" title=\"Free-quenching-exemplo\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Free-quenching-example.gif\" alt=\"Free-quenching-exemplo\" width=\"579\" height=\"258\" \/><\/p>\n<p><strong>FIGURA 2.<\/strong>\u00a0O desenvolvimento de tens\u00e3o t\u00e9rmica residual em uma pe\u00e7a de \"t\u00eampera livre\" devido a varia\u00e7\u00f5es no resfriamento ao longo da pe\u00e7a moldada e a resposta do material ao hist\u00f3rico de temperatura.<\/p>","protected":false},"excerpt":{"rendered":"<p>A culprit in shrinkage and warpage problems Residual stress is a process-induced stress, frozen in a molded part. It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. If they are strong enough to overcome the structural integrity of the part, the part will warp upon ejection, or later [&hellip;]<\/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 v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\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\/pt\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\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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