{"id":103031,"date":"2025-09-18T08:00:00","date_gmt":"2025-09-18T06:00:00","guid":{"rendered":"https:\/\/www.linseis.com\/sem-categoria\/analise-termomecanica-tma-para-avaliar-a-funcao-de-vedacao-no-compartimento-do-motor-envelhecimento-e-comportamento-a-longo-prazo-das-vedacoes-de-elastomero\/"},"modified":"2026-01-12T09:24:56","modified_gmt":"2026-01-12T08:24:56","slug":"analise-termomecanica-tma-para-avaliar-a-funcao-de-vedacao-no-compartimento-do-motor-envelhecimento-e-comportamento-a-longo-prazo-das-vedacoes-de-elastomero","status":"publish","type":"post","link":"https:\/\/www.linseis.com\/pt-pt\/conhecimentos\/analise-termomecanica-tma-para-avaliar-a-funcao-de-vedacao-no-compartimento-do-motor-envelhecimento-e-comportamento-a-longo-prazo-das-vedacoes-de-elastomero\/","title":{"rendered":"An\u00e1lise termomec\u00e2nica (TMA) para avaliar a fun\u00e7\u00e3o de veda\u00e7\u00e3o no compartimento do motor: envelhecimento e comportamento a longo prazo das veda\u00e7\u00f5es de elast\u00f3mero"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"103031\" class=\"elementor elementor-103031 elementor-97336\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6bd4797 e-flex e-con-boxed e-con e-parent\" data-id=\"6bd4797\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-9371cb7 e-con-full e-flex e-con e-child\" data-id=\"9371cb7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-63565fd e-con-full e-flex e-con e-child\" data-id=\"63565fd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a67530a e-con-full e-flex e-con e-child\" data-id=\"a67530a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element 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data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\t\u00cdndice\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__ee7a081\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button 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858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-16c5db9 elementor-widget elementor-widget-spacer\" data-id=\"16c5db9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bc7b668 elementor-widget elementor-widget-heading\" data-id=\"bc7b668\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introdu\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-970a207 elementor-widget elementor-widget-text-editor\" data-id=\"970a207\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As borrachas de veda\u00e7\u00e3o elastom\u00e9ricas, como as utilizadas no compartimento do motor dos ve\u00edculos autom\u00f3veis e em aplica\u00e7\u00f5es aeron\u00e1uticas, est\u00e3o expostas a tens\u00f5es termomec\u00e2nicas permanentes. O seu efeito de veda\u00e7\u00e3o &#8211; a capacidade de impedir a entrada e a sa\u00edda de l\u00edquidos e gases &#8211; \u00e9 um fator essencial para a fiabilidade e a durabilidade de todo o sistema. A avalia\u00e7\u00e3o cientificamente s\u00f3lida e a previs\u00e3o do comportamento a longo prazo destes componentes cr\u00edticos requerem m\u00e9todos de an\u00e1lise precisos que possam captar a complexa intera\u00e7\u00e3o entre temperatura, tens\u00e3o mec\u00e2nica e tempo.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c9098dc elementor-widget elementor-widget-spacer\" data-id=\"c9098dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1d13468 elementor-widget elementor-widget-heading\" data-id=\"1d13468\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mecanismos de perda de veda\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0de0124 elementor-widget elementor-widget-heading\" data-id=\"0de0124\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Efeitos a curto prazo<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5032810 elementor-widget elementor-widget-text-editor\" data-id=\"5032810\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A curto prazo, o efeito de veda\u00e7\u00e3o pode ser prejudicado por expans\u00e3o e contra\u00e7\u00e3o t\u00e9rmicas, flutua\u00e7\u00f5es de press\u00e3o ou erros de instala\u00e7\u00e3o. Os efeitos carater\u00edsticos como a flu\u00eancia, o comportamento de assentamento e os primeiros sinais de relaxamento &#8211; especialmente a altas temperaturas &#8211; podem ser observados j\u00e1 durante as primeiras horas de funcionamento. Estas altera\u00e7\u00f5es iniciais podem j\u00e1 ter efeitos cr\u00edticos na estanquidade do sistema.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3009f02 elementor-widget elementor-widget-heading\" data-id=\"3009f02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Mecanismos de envelhecimento a longo prazo<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-38bc1b8 elementor-widget elementor-widget-text-editor\" data-id=\"38bc1b8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A longo prazo, predominam mecanismos de envelhecimento complexos, que afectam as propriedades fundamentais do material:<\/p><p><strong>Decomposi\u00e7\u00e3o oxidativa:<\/strong> As reac\u00e7\u00f5es qu\u00edmicas induzidas pelo oxig\u00e9nio conduzem \u00e0 cis\u00e3o da cadeia e a altera\u00e7\u00f5es das liga\u00e7\u00f5es cruzadas na rede do pol\u00edmero.<\/p><p><strong>Perda de plastificante:<\/strong> A migra\u00e7\u00e3o e a evapora\u00e7\u00e3o de plastificantes reduzem a flexibilidade e aumentam a rigidez do material.<\/p><p><strong>Fissuras mec\u00e2nicas:<\/strong> As cargas c\u00edclicas levam ao in\u00edcio e \u00e0 propaga\u00e7\u00e3o de fissuras, o que compromete a integridade estrutural.<\/p><p><strong>Deforma\u00e7\u00f5es irrevers\u00edveis:<\/strong> A deforma\u00e7\u00e3o pl\u00e1stica e o conjunto de compress\u00e3o reduzem a resili\u00eancia e, consequentemente, o efeito de veda\u00e7\u00e3o.<\/p><p>Estudos demonstram que as borrachas EPDM (EPDM: mon\u00f3mero de etileno-propileno-dieno), por exemplo, podem apresentar perdas vis\u00edveis nas propriedades de veda\u00e7\u00e3o ap\u00f3s anos em condi\u00e7\u00f5es pr\u00e1ticas, apesar das excelentes propriedades iniciais devido ao envelhecimento t\u00e9rmico e mec\u00e2nico<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-979af68 elementor-widget elementor-widget-heading\" data-id=\"979af68\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">A an\u00e1lise termomec\u00e2nica como tecnologia-chave<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-872108c elementor-widget elementor-widget-heading\" data-id=\"872108c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Princ\u00edpio b\u00e1sico da TMA<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1602f6 elementor-widget elementor-widget-text-editor\" data-id=\"d1602f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\">\n  <strong>A an\u00e1lise termomec\u00e2nica (TMA)<\/strong>\n<\/a> \u00e9 um m\u00e9todo comprovado e cientificamente baseado para investigar o comportamento dependente do tempo e da temperatura dos materiais de veda\u00e7\u00e3o. Na TMA, uma amostra \u00e9 sujeita a um programa controlado de varia\u00e7\u00e3o de temperatura e a uma for\u00e7a definida. A altera\u00e7\u00e3o no comprimento (expans\u00e3o ou contra\u00e7\u00e3o) do material \u00e9 medida em fun\u00e7\u00e3o da temperatura e da carga. Para al\u00e9m da expans\u00e3o t\u00e9rmica, \u00e9 poss\u00edvel determinar com precis\u00e3o o comportamento de flu\u00eancia e relaxamento, bem como as temperaturas de transi\u00e7\u00e3o v\u00edtrea e as transi\u00e7\u00f5es de fase.   <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c20ab74 elementor-widget elementor-widget-heading\" data-id=\"c20ab74\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Influ\u00eancia da TMA na avalia\u00e7\u00e3o do efeito de selagem<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11ce39b elementor-widget elementor-widget-text-editor\" data-id=\"11ce39b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O TMA \u00e9 essencial para avaliar o efeito de veda\u00e7\u00e3o no compartimento do motor, uma vez que permite medir e quantificar com precis\u00e3o o comportamento de deforma\u00e7\u00e3o dependente da temperatura e da carga das juntas de borracha. Isto \u00e9 crucial para prever at\u00e9 que ponto uma junta cumprir\u00e1 a sua fun\u00e7\u00e3o a longo prazo em condi\u00e7\u00f5es reais de funcionamento &#8211; tais como temperaturas elevadas, cargas vari\u00e1veis e compress\u00e3o prolongada. <\/p><p>Os resultados da investiga\u00e7\u00e3o mostram que o comportamento de veda\u00e7\u00e3o das juntas de perfil e planas no compartimento do motor n\u00e3o depende apenas da sua geometria e elasticidade iniciais, mas tamb\u00e9m, em grande medida, do seu comportamento de deforma\u00e7\u00e3o sob temperatura, carga mec\u00e2nica e ao longo do tempo. A TMA fornece as carater\u00edsticas decisivas do material para este efeito e permite, assim, uma avalia\u00e7\u00e3o cientificamente s\u00f3lida da forma como a fun\u00e7\u00e3o de veda\u00e7\u00e3o se altera ou se perde sob as tens\u00f5es t\u00edpicas do compartimento do motor. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0fec12b elementor-widget elementor-widget-heading\" data-id=\"0fec12b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Carater\u00edsticas das vari\u00e1veis medidas e sua import\u00e2ncia<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-661a05d elementor-widget elementor-widget-text-editor\" data-id=\"661a05d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Com o <a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\">\n  <strong>TMA<\/strong>\n<\/a> pode ser utilizado para determinar v\u00e1rias propriedades de material decisivas para veda\u00e7\u00f5es de borracha no sector autom\u00f3vel, que s\u00e3o relevantes para a utiliza\u00e7\u00e3o e vida \u00fatil no compartimento do motor:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-455293b elementor-widget elementor-widget-heading\" data-id=\"455293b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Coeficiente de expans\u00e3o t\u00e9rmica (CTE)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-46661ed elementor-widget elementor-widget-text-editor\" data-id=\"46661ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Defini\u00e7\u00e3o e avalia\u00e7\u00e3o:<\/strong> O <a href=\"https:\/\/www.linseis.com\/messgroessen\/laengenausdehnungskoeffizient\/\"><strong>CTE<\/strong> <\/a>descreve a varia\u00e7\u00e3o relativa do comprimento por unidade de temperatura e \u00e9 um par\u00e2metro importante para avaliar o quanto a borracha de veda\u00e7\u00e3o muda com as flutua\u00e7\u00f5es de temperatura.<\/p><p><strong>Significado pr\u00e1tico:<\/strong> A medi\u00e7\u00e3o baseada na TMA mostra o quanto o material de veda\u00e7\u00e3o se expande ou contrai com as flutua\u00e7\u00f5es de temperatura t\u00edpicas do compartimento do motor. Isto \u00e9 essencial para evitar a forma\u00e7\u00e3o de fendas e, consequentemente, fugas durante os ciclos de temperatura. Uma expans\u00e3o excessiva pode levar a fugas, enquanto uma expans\u00e3o insuficiente pode levar a perdas de press\u00e3o.  <\/p><p><a href=\"https:\/\/www.linseis.com\/wissen\/glasuebergangstemperatur\/\"><strong>Temperatura de transi\u00e7\u00e3o v\u00edtrea (Tg)<\/strong><\/a><\/p><p><strong>Determina\u00e7\u00e3o:<\/strong> A TMA permite a determina\u00e7\u00e3o exacta da temperatura \u00e0 qual o material muda de um estado duro-fr\u00e1gil para um estado el\u00e1stico-borrachoso.<\/p><p><strong>Import\u00e2ncia cr\u00edtica:<\/strong> A Tg indica a temperatura \u00e0 qual um material muda de el\u00e1stico firme para el\u00e1stico macio &#8211; importante para a gest\u00e3o dos limites de funcionamento. \u00c9 importante saber quando \u00e9 que o vedante pode falhar em condi\u00e7\u00f5es de funcionamento. <\/p><p><strong>Comportamento de flu\u00eancia e relaxamento<\/strong><\/p><p><strong>Caracteriza\u00e7\u00e3o:<\/strong> As medi\u00e7\u00f5es TMA registam a ced\u00eancia dependente do tempo do material sob carga constante. Estas an\u00e1lises mostram a ced\u00eancia ou assentamento dependente do tempo do material sob carga e temperatura constantes. <\/p><p><strong>Relev\u00e2ncia a longo prazo:<\/strong> Cr\u00edtica para a estanquidade a longo prazo, uma vez que as cargas actuam durante um longo per\u00edodo de tempo, particularmente no compartimento do motor, o que pode deformar lentamente o material de veda\u00e7\u00e3o, reduzindo o efeito de veda\u00e7\u00e3o a longo prazo. Os mecanismos de relaxamento e de flu\u00eancia podem alterar a estrutura ao longo dos anos. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9312c77 elementor-widget elementor-widget-spacer\" data-id=\"9312c77\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a9f03ee elementor-widget elementor-widget-image\" data-id=\"a9f03ee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/177-1024x576.png\" class=\"attachment-large size-large wp-image-97346\" alt=\"\" srcset=\"https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/177-1024x576.png 1024w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/177-300x169.png 300w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/177-768x432.png 768w, https:\/\/www.linseis.com\/wp-content\/uploads\/2025\/09\/177.png 1140w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e612d63 elementor-widget elementor-widget-spacer\" data-id=\"e612d63\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5cf22c elementor-widget elementor-widget-heading\" data-id=\"d5cf22c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Altera\u00e7\u00f5es estruturais e degrada\u00e7\u00e3o a longo prazo<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4035411 elementor-widget elementor-widget-text-editor\" data-id=\"4035411\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Dete\u00e7\u00e3o:<\/strong> Os ensaios TMA de longa dura\u00e7\u00e3o permitem visualizar as perdas irrevers\u00edveis de material, tais como o assentamento, que podem ocorrer particularmente sob cargas c\u00edclicas.<\/p><p><strong>Relev\u00e2ncia pr\u00e1tica:<\/strong> Estes valores carater\u00edsticos s\u00e3o importantes para prever a vida \u00fatil e os intervalos de manuten\u00e7\u00e3o e s\u00e3o particularmente relevantes para as juntas do compartimento do motor, que s\u00e3o sens\u00edveis \u00e0 temperatura.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6def0c7 elementor-widget elementor-widget-heading\" data-id=\"6def0c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Transi\u00e7\u00f5es de fase e comportamento de amortecimento<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d6360a elementor-widget elementor-widget-text-editor\" data-id=\"6d6360a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Dete\u00e7\u00e3o:<\/strong> Para al\u00e9m da transi\u00e7\u00e3o v\u00edtrea, a <a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\">\n  <strong>TMA<\/strong>\n<\/a> tamb\u00e9m visualiza outras altera\u00e7\u00f5es estruturais (por exemplo, amolecimento, fus\u00e3o de fases) que podem alterar abruptamente as propriedades do material.<\/p><p><strong>Import\u00e2ncia sist\u00e9mica:<\/strong> Estas transi\u00e7\u00f5es s\u00e3o fundamentais para compreender o comportamento dos materiais em condi\u00e7\u00f5es de funcionamento extremas.<\/p><p><strong>Influ\u00eancia da expans\u00e3o t\u00e9rmica na estanquidade a longo prazo<\/strong><\/p><p>A expans\u00e3o t\u00e9rmica das juntas \u00e9 um fator chave que influencia o efeito de veda\u00e7\u00e3o a longo prazo e a fiabilidade das juntas no compartimento do motor. O comportamento de expans\u00e3o dos materiais de borracha pode ser quantificado com precis\u00e3o utilizando a TMA. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c709f2 elementor-widget elementor-widget-heading\" data-id=\"0c709f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Efeitos cr\u00edticos na fun\u00e7\u00e3o de veda\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c1bf6f elementor-widget elementor-widget-text-editor\" data-id=\"1c1bf6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Altera\u00e7\u00f5es dimensionais durante os ciclos de temperatura:<\/strong> Os vedantes de elast\u00f3mero expandem-se quando aquecidos e contraem-se quando arrefecidos. Estes movimentos c\u00edclicos conduzem \u00e0 fadiga do material, a fissuras ou \u00e0 abras\u00e3o, especialmente em utiliza\u00e7\u00e3o prolongada. Se a dilata\u00e7\u00e3o t\u00e9rmica for demasiado grande, pode levar \u00e0 forma\u00e7\u00e3o de fendas ou a uma compress\u00e3o excessiva &#8211; o que favorece as fugas.  <\/p><p><strong>Influ\u00eancia na compress\u00e3o:<\/strong> A tens\u00e3o t\u00e9rmica permanente faz com que o material de veda\u00e7\u00e3o se torne mais macio, o chamado &#8220;conjunto de compress\u00e3o<span style=\"text-decoration: line-through;\">&#8221; <\/span> aumenta. Isto significa que a veda\u00e7\u00e3o j\u00e1 n\u00e3o regressa totalmente \u00e0 sua forma original, o que leva a uma lacuna permanente e \u00e0 perda de desempenho. <\/p><p><strong>Acelera\u00e7\u00e3o dos processos de envelhecimento:<\/strong> A tens\u00e3o t\u00e9rmica repetida promove o comportamento de flu\u00eancia e relaxamento do material, o que tem um efeito negativo direto no efeito de veda\u00e7\u00e3o.<\/p><p><strong>Expans\u00e3o t\u00e9rmica diferente da dos componentes vizinhos:<\/strong> Se os CTEs da junta e do flange n\u00e3o coincidirem, ocorrem tens\u00f5es desiguais, o que pode acelerar a falha da junta.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fd593b1 elementor-widget elementor-widget-heading\" data-id=\"fd593b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Aplica\u00e7\u00e3o pr\u00e1tica e implementa\u00e7\u00e3o em laborat\u00f3rio<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-973d767 elementor-widget elementor-widget-heading\" data-id=\"973d767\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Sistemas TMA para aplica\u00e7\u00f5es autom\u00f3veis<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b45e236 elementor-widget elementor-widget-text-editor\" data-id=\"b45e236\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\">\n  <strong>Os aparelhos TMA<\/strong>\n<\/a> suportam an\u00e1lises de alta precis\u00e3o e em conformidade com as normas (DIN, ASTM, ISO) de materiais de borracha de veda\u00e7\u00e3o sob v\u00e1rias atmosferas e programas de temperatura &#8211; tal como \u00e9 essencial nos laborat\u00f3rios autom\u00f3veis e aeroespaciais. Protocolos especiais para elast\u00f3meros permitem condi\u00e7\u00f5es de teste &#8220;realistas&#8221;, t\u00edpicas da utiliza\u00e7\u00e3o pr\u00e1tica no compartimento do motor. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a8afc5 elementor-widget elementor-widget-heading\" data-id=\"6a8afc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Base para a tomada de decis\u00f5es na pr\u00e1tica<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-804888b elementor-widget elementor-widget-text-editor\" data-id=\"804888b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O TMA fornece dados objectivos e quantitativamente fi\u00e1veis que os engenheiros de desenvolvimento e o pessoal de laborat\u00f3rio podem utilizar para responder \u00e0s seguintes quest\u00f5es cr\u00edticas:<\/p><ul><li>Qual \u00e9 a expans\u00e3o m\u00e1xima da junta no intervalo de temperatura relevante?<\/li><li>Qual a intensidade com que os materiais individuais (por exemplo, EPDM vs. FKM vs. silicone) s\u00e3o afectados pela compress\u00e3o e pela flu\u00eancia?<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-12ef22c elementor-widget elementor-widget-heading\" data-id=\"12ef22c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Desenvolvimentos actuais da investiga\u00e7\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5f28b2c elementor-widget elementor-widget-heading\" data-id=\"5f28b2c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Inova\u00e7\u00f5es de materiais<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c26732 elementor-widget elementor-widget-text-editor\" data-id=\"1c26732\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Um estudo recente mostra que os novos materiais, como os vulcanisatos termopl\u00e1sticos (TPV), oferecem frequentemente propriedades mec\u00e2nicas mais est\u00e1veis e um efeito de veda\u00e7\u00e3o compar\u00e1vel ao EPDM cl\u00e1ssico &#8211; sendo que o seu comportamento de relaxamento e endurecimento a longo prazo tamb\u00e9m foi caracterizado por TMA (PMC Paper, 2023).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-168742b elementor-widget elementor-widget-heading\" data-id=\"168742b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Valida\u00e7\u00e3o cient\u00edfica<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6edf19a elementor-widget elementor-widget-text-editor\" data-id=\"6edf19a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Uma disserta\u00e7\u00e3o pormenorizada examinou o comportamento dos vedantes de EPDM no contexto dos vedantes para autom\u00f3veis, tanto a curto como a longo prazo. Descreve a forma como os mecanismos de relaxamento e de flu\u00eancia podem alterar a estrutura ao longo dos anos e salienta a import\u00e2ncia da TMA para identificar esses fen\u00f3menos de degrada\u00e7\u00e3o. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c5bcffa elementor-widget elementor-widget-heading\" data-id=\"c5bcffa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\u00c1reas de aplica\u00e7\u00e3o e relev\u00e2ncia industrial<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d33b0a elementor-widget elementor-widget-text-editor\" data-id=\"5d33b0a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As <a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\">\n  <strong>TMA<\/strong>\n<\/a> \u00e9 utilizado tanto na sele\u00e7\u00e3o e desenvolvimento de materiais como no controlo de qualidade das veda\u00e7\u00f5es de borracha utilizadas, formando assim a base para uma previs\u00e3o fi\u00e1vel da vida \u00fatil no sector autom\u00f3vel. Os pontos cr\u00edticos podem ser reconhecidos numa fase inicial e os materiais podem ser desenvolvidos de forma orientada. <\/p><p>Esta informa\u00e7\u00e3o \u00e9 essencial para:<\/p><ul><li><strong>Sele\u00e7\u00e3o de materiais:<\/strong> Avalia\u00e7\u00e3o objetiva de diferentes elast\u00f3meros<\/li><li><strong>Controlo de qualidade:<\/strong> monitoriza\u00e7\u00e3o das carater\u00edsticas do material na produ\u00e7\u00e3o<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a7b14e9 elementor-widget elementor-widget-heading\" data-id=\"a7b14e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclus\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-69ff486 elementor-widget elementor-widget-text-editor\" data-id=\"69ff486\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A medi\u00e7\u00e3o da expans\u00e3o t\u00e9rmica e do comportamento mec\u00e2nico com base na TMA \u00e9 essencial para selecionar e conceber materiais de juntas que suportem os requisitos t\u00e9rmicos reais ao longo da vida \u00fatil do ve\u00edculo.<\/p><p>S\u00f3 atrav\u00e9s de uma carateriza\u00e7\u00e3o precisa da TMA \u00e9 poss\u00edvel desenvolver sistemas de veda\u00e7\u00e3o que funcionem de forma fi\u00e1vel no compartimento do motor, mesmo ap\u00f3s muitos anos, e que evitem fugas de forma fi\u00e1vel a longo prazo. Sele\u00e7\u00e3o do material e conce\u00e7\u00e3o optimizada da junta com base nos <a href=\"https:\/\/www.linseis.com\/messgeraete\/thermische-analyse\/tma-thermomechanische-analyse\/\"><strong>resultados da TMA<\/strong> <\/a>reduzem significativamente o risco de falha devido \u00e0 expans\u00e3o t\u00e9rmica. <\/p><p>Os resultados laboratoriais do TMA constituem a base cient\u00edfica para a avalia\u00e7\u00e3o e especifica\u00e7\u00e3o corretas da estanquidade a longo prazo. O m\u00e9todo \u00e9 indispens\u00e1vel para o desenvolvimento moderno e para a garantia de qualidade dos sistemas de veda\u00e7\u00e3o de elast\u00f3meros nas ind\u00fastrias autom\u00f3vel e aeron\u00e1utica. <a href=\"https:\/\/www.linseis.com\/applikationen\/automobil-luft-und-raumfahrt\/\">\n  <strong>ind\u00fastrias autom\u00f3vel e aeron\u00e1utica.<\/strong>\n<\/a> <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61017de elementor-widget elementor-widget-spacer\" data-id=\"61017de\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eee923c elementor-widget elementor-widget-text-editor\" data-id=\"eee923c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Bibliografia<\/strong><\/p><p><strong>Nayak, J., Katheria, A., &amp; Das, N.C. (2022). Investiga\u00e7\u00e3o sobre a compatibilidade material dos an\u00e9is de veda\u00e7\u00e3o em elast\u00f3mero. <em>Polymers<\/em>, 14(16), 3323. <a href=\"https:\/\/www.mdpi.com\/2073-4360\/14\/16\/3323\" target=\"_blank\" rel=\"noopener\">https:\/\/www.mdpi.com\/2073-4360\/14\/16\/3323<\/a>  <\/strong><\/p><p><strong> <\/strong><\/p><p><strong>Drobny, J.G. (2021). Investiga\u00e7\u00e3o da resposta termomec\u00e2nica de materiais comp\u00f3sitos polim\u00e9ricos produzidos atrav\u00e9s de tecnologias de fabrico aditivo. <em>Materials<\/em>, 15(14), 5069. <a href=\"https:\/\/www.mdpi.com\/1996-1944\/15\/14\/5069\" target=\"_blank\" rel=\"noopener\">https:\/\/www.mdpi.com\/1996-1944\/15\/14\/5069<\/a> <\/strong><\/p><p> <\/p><p><strong>Normas t\u00e9cnicas:<\/strong><\/p><ul><li>ASTM E831 (&#8220;Standard Test Method for Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis&#8221;) para ensaios termomec\u00e2nicos<\/li><li><strong>Normas ISO:<\/strong> ISO 23529 para materiais de veda\u00e7\u00e3o<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>As borrachas de veda\u00e7\u00e3o de elast\u00f3meros, como as utilizadas no compartimento do motor dos ve\u00edculos autom\u00f3veis e em aplica\u00e7\u00f5es aeron\u00e1uticas, est\u00e3o expostas a cargas termomec\u00e2nicas permanentes.<\/p>\n","protected":false},"author":15,"featured_media":97357,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[654],"tags":[],"class_list":["post-103031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conhecimentos"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts\/103031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/comments?post=103031"}],"version-history":[{"count":0,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/posts\/103031\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media\/97357"}],"wp:attachment":[{"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/media?parent=103031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/categories?post=103031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linseis.com\/pt-pt\/wp-json\/wp\/v2\/tags?post=103031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}