{"id":1668,"date":"2020-06-16T17:30:49","date_gmt":"2020-06-16T22:30:49","guid":{"rendered":"https:\/\/resqjack.wpengine.com\/?p=1668"},"modified":"2020-06-18T20:20:16","modified_gmt":"2020-06-19T01:20:16","slug":"are-composite-struts-appropriate-for-the-extrication-environment","status":"publish","type":"post","link":"https:\/\/res-q-jack.com\/pt\/news\/are-composite-struts-appropriate-for-the-extrication-environment\/","title":{"rendered":"As Estruturas Compostas s\u00e3o Apropriadas para o Ambiente de Extradica\u00e7\u00e3o?"},"content":{"rendered":"<ul>\n\t\t<li><a href=\"https:\/\/res-q-jack.com\/wp-json\/dl\/9685521\" target=\"_blank\" rel=\"noopener noreferrer\"><\/a>\t\t\t\t\n\t\tDownload Vers\u00e3o para impress\u00e3o<\/li>\t<\/ul>\n\t<p><img decoding=\"async\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/02\/Super-X-Strut-Heavy-Duty-Vehicle-Stabilization-Strut-4.jpg\" alt=\"Super X-Strut Heavy Duty Vehicle Stabilization Strut 4\" width=\"421\" height=\"316\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 421px; --smush-placeholder-aspect-ratio: 421\/316;\" \/>Se voc\u00ea estiver considerando as escoras compostas de Pol\u00edmero Refor\u00e7ado com Fibra de Vidro (PRFV) pultrudado, por favor considere o seguinte Queremos ter certeza de que voc\u00ea est\u00e1 familiarizado n\u00e3o s\u00f3 com as vantagens de tais materiais, mas tamb\u00e9m com as caracter\u00edsticas n\u00e3o t\u00e3o desej\u00e1veis. Com este conhecimento, voc\u00ea pode tomar uma decis\u00e3o informada sobre a sele\u00e7\u00e3o do material de sua escora. N\u00f3s o incentivamos a selecionar o material mais seguro e sensato para sua determinada aplica\u00e7\u00e3o. H\u00e1 v\u00e1rias preocupa\u00e7\u00f5es ambientais, de manuseio, armazenamento e aplica\u00e7\u00e3o que voc\u00ea deve estar plenamente ciente de que podem n\u00e3o apenas aumentar a vida \u00fatil de seu suporte composto, mas tamb\u00e9m fornecer informa\u00e7\u00f5es cr\u00edticas de seguran\u00e7a de vida que podem mant\u00ea-lo fora de uma situa\u00e7\u00e3o desastrosa. Em um artigo da Universidade do Missouri, Antonio Nanni afirma que \"usar o PRFV na aplica\u00e7\u00e3o errada \u00e9 como martelar uma cavilha quadrada em um buraco redondo\".<\/p>\n<p>H\u00e1 uma boa chance de que seu interesse em suportes compostos se deva a alguns dos suportes compostos de marketing como \"mais fortes que o a\u00e7o\", n\u00e3o-condutores, leves, etc.  H\u00e1 alguma verdade no que foi dito acima, mas voc\u00ea precisa de toda a verdade para fazer uma sele\u00e7\u00e3o educada.<\/p>\n<div id=\"attachment_1801\" style=\"width: 429px\" class=\"wp-caption alignleft\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1801\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/06\/image001.png\" alt=\"As Estruturas Compostas s\u00e3o Apropriadas para o Ambiente de Extradica\u00e7\u00e3o?\" width=\"419\" height=\"205\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 419px; --smush-placeholder-aspect-ratio: 419\/205;\" \/><p id=\"caption-attachment-1801\" class=\"wp-caption-text\">Extra\u00eddo de: https:\/\/apps.dtic.mil\/dtic\/tr\/fulltext\/u2\/a403282.pdf<\/p><\/div>\n<p>Com rela\u00e7\u00e3o \u00e0 resist\u00eancia dos comp\u00f3sitos de PRFV pultrudados em rela\u00e7\u00e3o ao a\u00e7o, os engenheiros de comp\u00f3sitos sugeriram que a \u00e1rea da se\u00e7\u00e3o transversal composta deveria ser cerca de tr\u00eas vezes a \u00e1rea transversal de uma estrutura de a\u00e7o similar para igualar a resist\u00eancia. Em outras palavras, para igualar a resist\u00eancia de um tubo de a\u00e7o quadrado de 2\" com uma parede de 1\/8\" de espessura, seria necess\u00e1rio um tubo composto quadrado de 2\" com cerca de 3\/8\" de espessura de parede. A unidade para a unidade de a\u00e7o \u00e9 mais forte que a maioria dos comp\u00f3sitos pultrudados de PRFV.<\/p>\n\t<div id=\"attachment_1673\" style=\"width: 1034px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1673\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/06\/photo-collage-1024x343.jpg\" alt=\"\" width=\"1024\" height=\"343\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/343;\" \/><p id=\"caption-attachment-1673\" class=\"wp-caption-text\">Na foto acima est\u00e3o os prot\u00f3tipos compostos de PRFV (pol\u00edmero refor\u00e7ado com fibra de vidro) da Res-Q-Jack. Devido aos maus resultados dos testes, o Res-Q-Jack concluiu que este material n\u00e3o tem lugar no ambiente de extrus\u00e3o.<\/p><\/div>\n<p>Os comp\u00f3sitos de PRFV pultrudados t\u00eam mau desempenho quando se trata de carga de impacto transversal. S\u00e3o materiais que voc\u00ea n\u00e3o quer deixar cair sobre objetos ou deixar cair objetos sobre eles. Em um teste simples, um peso redondo de 6 libras foi largado da altura da cintura para uma pe\u00e7a quadrada de 2,5\" de tubo composto de PRFV pultrudado com uma parede espessa \u00bc\". O material foi destru\u00eddo pelo impacto. O mesmo teste realizado em tubos de a\u00e7o galvanizado de 2,25\" quadrados com parede de 1\/8\" de espessura produziu pouco efeito. Outro problema no mundo dos comp\u00f3sitos s\u00e3o as juntas com pinos. Deve-se tomar muito cuidado na sele\u00e7\u00e3o de fixadores e no projeto de juntas devido \u00e0 baixa capacidade de suportar tens\u00f5es nos furos. Os pinos e, portanto, os furos devem ter um grande di\u00e2metro para espalhar a carga do mancal sobre uma maior superf\u00edcie de parede. O a\u00e7o, por outro lado, pode resistir a uma carga muito maior de suporte do fixador. Um pino de 3\/8\" de di\u00e2metro em cisalhamento duplo pulverizar\u00e1 a parede lateral do tubo composto de 2\" de PRFV quadrado pultrudado com uma parede espessa de \u00bc\" a cerca de 6.000 lbs. Um tubo de a\u00e7o quadrado de 2\" com uma parede de 1\/8\" suportar\u00e1 cerca do dobro da carga sem danificar o mancal do furo.<\/p>\n<p>Se seu ambiente de aplica\u00e7\u00e3o envolver abras\u00e3o, voc\u00ea pode querer evitar os comp\u00f3sitos. Os tubos compostos de PRFV pultrudados s\u00e3o muito suscet\u00edveis ao desgaste por abras\u00e3o. O contato deslizante entre este material e qualquer material abrasivo como asfalto, concreto ou outros materiais danificar\u00e1 a superf\u00edcie do tubo. Os arranh\u00f5es ou goivaduras que ocorrem removem o v\u00e9u de prote\u00e7\u00e3o que auxilia na resist\u00eancia aos raios UV e na prote\u00e7\u00e3o das fibras. O desgaste pode ser significativo o suficiente para que a resist\u00eancia da tubula\u00e7\u00e3o seja question\u00e1vel. Acredita-se que o desgaste seja causado pelo contato vibrat\u00f3rio entre os suportes das escoras e as escoras compostas durante o transporte. O desgaste observado foi um recesso horizontal atrav\u00e9s da face de uma parede do tubo. A profundidade do rebaixo era de cerca de 1\/16\". Isso \u00e9 25% da espessura da parede se for usado o material da parede \u00bc\". Mangas protetoras similares \u00e0s utilizadas com cilindros SCBA compostos podem ser uma boa solu\u00e7\u00e3o para o desgaste relacionado ao armazenamento.<\/p>\n<div id=\"attachment_1802\" style=\"width: 848px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1802\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/06\/image002.png\" alt=\"\" width=\"838\" height=\"179\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 838px; --smush-placeholder-aspect-ratio: 838\/179;\" \/><p id=\"caption-attachment-1802\" class=\"wp-caption-text\">Extra\u00eddo de: http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.165.1163&amp;rep=rep1&amp;type=pdf<\/p><\/div>\n<p>A umidade tamb\u00e9m pode causar problemas com os comp\u00f3sitos. L\u00edquidos como \u00e1gua, \u00f3leo, combust\u00edvel e fluidos corporais s\u00e3o normalmente impedidos de entrar em um material composto de PRFV pultrudado quando todas as superf\u00edcies expostas s\u00e3o seladas e livres de danos. Entretanto, os tubos compostos usados para escoras de estabiliza\u00e7\u00e3o t\u00eam extremidades cortadas expostas, orif\u00edcios cruzados perfurados e, se usados em um ambiente abusivo como a extrus\u00e3o, muito provavelmente apresentam danos abrasivos e\/ou de impacto. Todos estes s\u00e3o caminhos para a entrada de umidade de uma fonte de \u00e1gua ou atmosfera \u00famida na matriz e ocupam os vazios. A umidade pode levar a um incha\u00e7o do material composto. Com se\u00e7\u00f5es de tubos telesc\u00f3picos de encaixe pr\u00f3ximo, isto pode causar problemas com a capacidade de telescopagem. A umidade embutida na escora afetar\u00e1 a resist\u00eancia diel\u00e9trica, reduzindo tamb\u00e9m a capacidade de isolamento el\u00e9trico do material. Dependendo da alcalinidade do tipo de \u00e1gua e fibra, a umidade pode ter um efeito corrosivo sobre as fibras. A umidade nos comp\u00f3sitos pode ser removida em um forno de secagem.<\/p>\n<div id=\"attachment_1803\" style=\"width: 458px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1803\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/06\/image003.png\" alt=\"\" width=\"448\" height=\"82\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 448px; --smush-placeholder-aspect-ratio: 448\/82;\" \/><p id=\"caption-attachment-1803\" class=\"wp-caption-text\">Extra\u00eddo de: http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.165.1163&amp;rep=rep1&amp;type=pdf<\/p><\/div>\n<p>Os compostos de PRFV podem conter aditivos que retardam os efeitos relacionados aos raios UV. Este aditivo protetor deve resistir bem por algum tempo, embora sua efic\u00e1cia decres\u00e7a com o tempo. Entretanto, os danos superficiais removem a cobertura de prote\u00e7\u00e3o, permitindo que a radia\u00e7\u00e3o UV se torne um problema. A \"flora\u00e7\u00e3o da fibra\" \u00e9 uma forma de dano UV.<\/p>\n<div id=\"attachment_1804\" style=\"width: 743px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1804\" data-src=\"https:\/\/res-q-jack.com\/wp-content\/uploads\/2020\/06\/image004.png\" alt=\"\" width=\"733\" height=\"181\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 733px; --smush-placeholder-aspect-ratio: 733\/181;\" \/><p id=\"caption-attachment-1804\" class=\"wp-caption-text\">Extra\u00eddo de: https:\/\/www.wernerco.com\/docs\/default-source\/literature\/gm6070-fg-techmanual.pdf?sfvrsn=dda06ff2_2<\/p><\/div>\n<p>As altas temperaturas podem ser uma preocupa\u00e7\u00e3o com os comp\u00f3sitos. N\u00e3o estamos t\u00e3o preocupados com a temperatura do ar como estamos preocupados com a temperatura do asfalto e temperaturas pr\u00f3ximas \u00e0 superf\u00edcie onde as escoras podem ser encenadas. As altas temperaturas podem diminuir a resist\u00eancia dos comp\u00f3sitos. De acordo com um fabricante de tubos de PRFV, 100\u00b0F reduzir\u00e1 a resist\u00eancia em 15%, 125\u00b0F diminuir\u00e1 a resist\u00eancia em 30% e 150\u00b0F diminuir\u00e1 a resist\u00eancia em 50%. Qual \u00e9 a temperatura da superf\u00edcie da estrada em Phoenix quando a temperatura do ar \u00e9 de 120\u00b0F? Uma fonte indica que uma temperatura do ar de 86\u00b0F sob luz solar direta pode produzir uma superf\u00edcie de estrada de 131\u00b0F.<\/p>\n<p>Com rela\u00e7\u00e3o ao uso de comp\u00f3sitos pultrudados de PRFV como isolante el\u00e9trico: Sim, os comp\u00f3sitos de PRFV s\u00e3o grandes isoladores el\u00e9tricos se o material estiver limpo, seco e sem danos. Como mencionado acima, a umidade e a contamina\u00e7\u00e3o podem reduzir significativamente as capacidades isolantes do material.<\/p>\n<p>Independentemente dos problemas que possam afetar negativamente a capacidade de isolamento, em uma situa\u00e7\u00e3o de perigo el\u00e9trico, pouco adianta ter uma escora isolada com uma conex\u00e3o de extremidade de a\u00e7o n\u00e3o isolada que o bombeiro segura enquanto engata o ve\u00edculo.<\/p>\n<p>As propriedades de condutividade el\u00e9trica devem ser uma quest\u00e3o n\u00e3o apenas pelas raz\u00f5es mencionadas acima, mas pela simples raz\u00e3o de que seria rid\u00edculo estabilizar conscientemente um ve\u00edculo carregado. Se o socorrista n\u00e3o souber que o ve\u00edculo est\u00e1 carregado, ele ou ela estar\u00e1 em apuros se estiver segurando uma cabe\u00e7a de escora n\u00e3o isolada em suas m\u00e3os enquanto engata o ve\u00edculo. O material da escora \u00e9 irrelevante. Deve-se ainda considerar o desafio de prender a escora de base ao ve\u00edculo. O resultado final \u00e9 que a resist\u00eancia diel\u00e9trica da escora n\u00e3o \u00e9 uma preocupa\u00e7\u00e3o.<\/p>\n<p>Com o acima exposto em mente, n\u00e3o deve ser surpresa que n\u00e3o recomendamos o uso de suportes compostos de PRFV pultrudados para uso no resgate di\u00e1rio de ve\u00edculos, uma vez que o ambiente \u00e9 simplesmente muito agressivo para o material. Entretanto, estas escoras leves podem ser a solu\u00e7\u00e3o para outra opera\u00e7\u00e3o espec\u00edfica de resgate que voc\u00ea possa encontrar. Pode ser \u00fatil ter um conjunto dispon\u00edvel para aquela situa\u00e7\u00e3o em que as escoras devem ser transportadas a uma grande dist\u00e2ncia para chegar ao local, como em alguma situa\u00e7\u00e3o de natureza selvagem.<\/p>","protected":false},"excerpt":{"rendered":"<p>Download Vers\u00e3o para impress\u00e3o Se voc\u00ea estiver considerando as escoras compostas de Pol\u00edmero Refor\u00e7ado com Fibra de Vidro (PRFV) pultrudado, favor considerar o seguinte. Queremos ter certeza de que voc\u00ea est\u00e1 familiarizado n\u00e3o s\u00f3 com as vantagens de tais materiais, mas tamb\u00e9m com as caracter\u00edsticas n\u00e3o t\u00e3o desej\u00e1veis. Com este conhecimento, voc\u00ea pode tomar uma decis\u00e3o informada sobre sua sele\u00e7\u00e3o de materiais de escoramento....<\/p>","protected":false},"author":5,"featured_media":771,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[8,10,9],"class_list":["post-1668","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-composite-struts","tag-pultruded-frp-composites","tag-struts"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Are Composite Struts Appropriate for the Extrication Environment? | Res-Q-Jack, Inc.<\/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:\/\/res-q-jack.com\/pt\/noticias\/are-composite-struts-appropriate-for-the-extrication-environment\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Are Composite Struts Appropriate for the Extrication Environment? | Res-Q-Jack, Inc.\" \/>\n<meta property=\"og:description\" content=\"Download Printer-Friendly Version If you are considering pultruded Fiberglass Reinforced Polymer (FRP) composite struts, please consider the following. 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