{"id":117192,"date":"2022-09-10T18:22:29","date_gmt":"2022-09-10T17:22:29","guid":{"rendered":"https:\/\/material-properties.org\/liga-6061-densidade-resistencia-dureza-ponto-de-fusao\/"},"modified":"2022-10-17T12:06:00","modified_gmt":"2022-10-17T11:06:00","slug":"liga-6061-densidade-resistencia-dureza-ponto-de-fusao","status":"publish","type":"post","link":"https:\/\/material-properties.org\/pt-br\/liga-6061-densidade-resistencia-dureza-ponto-de-fusao\/","title":{"rendered":"Liga 6061 &#8211; Densidade &#8211; Resist\u00eancia &#8211; Dureza &#8211; Ponto de Fus\u00e3o"},"content":{"rendered":"<h2>Sobre a Liga 6061<\/h2>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/07\/aluminium-alloy-min.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-full wp-image-29427\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/07\/aluminium-alloy-min.png\" alt=\"liga de alum\u00ednio\" width=\"456\" height=\"406\" \/><\/a>Em geral,\u00a0<strong>as ligas de alum\u00ednio da s\u00e9rie 6000<\/strong>\u00a0s\u00e3o ligadas com magn\u00e9sio e sil\u00edcio.\u00a0A liga 6061 \u00e9 uma das ligas mais utilizadas na s\u00e9rie 6000.\u00a0Possui boas propriedades mec\u00e2nicas, \u00e9 f\u00e1cil de usinar, \u00e9 sold\u00e1vel e pode ser endurecido por precipita\u00e7\u00e3o, mas n\u00e3o com as altas resist\u00eancias que 2000 e 7000 podem alcan\u00e7ar.\u00a0Tem uma resist\u00eancia \u00e0 corros\u00e3o muito boa e soldabilidade muito boa, embora resist\u00eancia reduzida na zona de solda.\u00a0As propriedades mec\u00e2nicas do 6061 dependem muito do temperamento, ou tratamento t\u00e9rmico, do material.\u00a0Em compara\u00e7\u00e3o com a liga 2024, a 6061 \u00e9 mais facilmente trabalhada e permanece resistente \u00e0 corros\u00e3o mesmo quando a superf\u00edcie \u00e9 desgastada.<\/p>\n<p>Esta liga estrutural padr\u00e3o, uma das mais vers\u00e1teis das ligas trat\u00e1veis \u200b\u200btermicamente, \u00e9 popular para requisitos de resist\u00eancia m\u00e9dia a alta e possui boas caracter\u00edsticas de tenacidade.\u00a0As aplica\u00e7\u00f5es v\u00e3o desde componentes de aeronaves (estruturas de aeronaves, como asas e fuselagens) at\u00e9 pe\u00e7as automotivas, como o chassi do Audi A8.\u00a0<strong>6061-T6<\/strong>\u00a0\u00e9 amplamente utilizado para quadros e componentes de bicicletas.<\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/6061-alloy-properties-density-strength-price-3.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108211\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/6061-alloy-properties-density-strength-price-3.png\" alt=\"pre\u00e7o de for\u00e7a de densidade de propriedades de liga 6061\" width=\"500\" height=\"500\" \/><\/a><\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h3 style=\"text-align: center;\">Resumo<\/h3>\n<table class=\"a\">\n<tbody>\n<tr class=\"b\">\n<td style=\"text-align: center;\">Nome<\/td>\n<td style=\"text-align: center;\"><strong>Liga 6061<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Fase em STP<\/td>\n<td style=\"text-align: center;\"><strong>s\u00f3lido<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Densidade<\/td>\n<td style=\"text-align: center;\"><strong>2700 kg\/m<sup>3<\/sup><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Resist\u00eancia \u00e0 tra\u00e7\u00e3o<\/td>\n<td style=\"text-align: center;\"><strong>290 MPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">For\u00e7a de rendimento<\/td>\n<td style=\"text-align: center;\"><strong>240 MPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">M\u00f3dulo de elasticidade de Young<\/td>\n<td style=\"text-align: center;\"><strong>69 GPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Dureza Brinell<\/td>\n<td style=\"text-align: center;\"><strong>105 BHN<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Ponto de fus\u00e3o<\/td>\n<td style=\"text-align: center;\"><strong>600 \u00b0C<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Condutividade t\u00e9rmica<\/td>\n<td style=\"text-align: center;\"><strong>150 W\/mK<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Capacidade de calor<\/td>\n<td style=\"text-align: center;\"><strong><span style=\"text-align: start;\">896 J\/gK<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Pre\u00e7o<\/td>\n<td style=\"text-align: center;\"><strong>6 $\/kg<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Densidade da Liga 6061<\/h2>\n<p class=\"wp-caption-text\">As densidades t\u00edpicas de v\u00e1rias subst\u00e2ncias est\u00e3o \u00e0 press\u00e3o atmosf\u00e9rica.\u00a0<a href=\"https:\/\/material-properties.org\/what-is-density-physics-definition\/\"><strong>A densidade<\/strong><\/a> \u00a0\u00e9 definida como a\u00a0<strong>massa por unidade de volume<\/strong>. \u00c9 uma\u00a0<strong>propriedade intensiva<\/strong>, que \u00e9 matematicamente definida como massa dividida pelo volume: <strong>\u03c1 = m\/V.<\/strong><\/p>\n<p>Em palavras, a densidade (\u03c1) de uma subst\u00e2ncia \u00e9 a massa total (m) dessa subst\u00e2ncia dividida pelo volume total (V) ocupado por essa subst\u00e2ncia. A unidade padr\u00e3o do SI \u00e9\u00a0<strong>quilogramas por metro c\u00fabico<\/strong> (<strong>kg\/m<sup>3<\/sup><\/strong>). A unidade padr\u00e3o inglesa \u00e9\u00a0<strong>libras de massa por p\u00e9 c\u00fabico<\/strong> (<strong>lbm\/ft<sup>3<\/sup><\/strong>).<\/p>\n<p>A densidade da liga 6061 \u00e9 de\u00a0<strong>2700 kg\/m<sup>3<\/sup>.<\/strong><\/p>\n<h3>Exemplo: Densidade<\/h3>\n<p>Calcule a altura de um cubo feito de Liga 6061, que pesa uma tonelada m\u00e9trica.<\/p>\n<p><strong>Solu\u00e7\u00e3o:<\/strong><\/p>\n<p><strong>A densidade<\/strong> \u00e9 definida como a <strong>massa por unidade de volume<\/strong>.\u00a0\u00c9 matematicamente definido como massa dividida pelo volume:\u00a0<strong>\u03c1 = m\/V.<\/strong><\/p>\n<p>Como o volume de um cubo \u00e9 a terceira pot\u00eancia de seus lados (V = a\u00a0<sup>3<\/sup>\u00a0), a altura desse cubo pode ser calculada:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-109279 size-full\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\" alt=\"densidade do material - equa\u00e7\u00e3o\" width=\"281\" height=\"125\" \/><\/a><\/p>\n<p>A altura deste cubo \u00e9 ent\u00e3o\u00a0<strong>a = 0,718 m<\/strong>.<\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Densidade de Materiais<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-108113 size-medium aligncenter\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png\" alt=\"Tabela de Materiais - Densidade de Materiais\" width=\"300\" height=\"179\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-1024x610.png 1024w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-768x458.png 768w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density.png 1368w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Propriedades Mec\u00e2nicas do Carboneto de Boro<\/h2>\n<h3>For\u00e7a da Liga 6061<\/h3>\n<p>Na mec\u00e2nica dos materiais, a\u00a0<a href=\"https:\/\/material-properties.org\/what-is-strength-definition\/\"><strong>resist\u00eancia de um material<\/strong><\/a>\u00a0\u00e9 sua capacidade de suportar uma carga aplicada sem falha ou deforma\u00e7\u00e3o pl\u00e1stica.\u00a0<strong>A resist\u00eancia dos materiais<\/strong>\u00a0considera basicamente a rela\u00e7\u00e3o entre as\u00a0<strong>cargas externas<\/strong>\u00a0aplicadas a um material e a\u00a0<strong>deforma\u00e7\u00e3o<\/strong>\u00a0resultante ou altera\u00e7\u00e3o nas dimens\u00f5es do material.\u00a0<strong>A resist\u00eancia de um material<\/strong>\u00a0\u00e9 sua capacidade de suportar esta carga aplicada sem falha ou deforma\u00e7\u00e3o pl\u00e1stica.<\/p>\n<h3>Resist\u00eancia \u00e0 tra\u00e7\u00e3o<\/h3>\n<p>A resist\u00eancia \u00e0 tra\u00e7\u00e3o final da liga de alum\u00ednio 6061 depende muito do temperamento do material, mas para o temperamento T6 \u00e9 de cerca de 290 MPa.<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Yield-Strength-Ultimate-Tensile-Strength-Table-of-Materials.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-medium wp-image-27807\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Yield-Strength-Ultimate-Tensile-Strength-Table-of-Materials-239x300.png\" alt=\"Resist\u00eancia ao escoamento - Resist\u00eancia \u00e0 tra\u00e7\u00e3o final - Tabela de materiais\" width=\"239\" height=\"300\" \/><\/a>A\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/strength\/stress-strain-curve-stress-strain-diagram\/ultimate-tensile-strength-uts\/\"><strong>resist\u00eancia \u00e0 tra\u00e7\u00e3o final<\/strong><\/a>\u00a0\u00e9 o m\u00e1ximo na\u00a0<a href=\"https:\/\/material-properties.org\/what-is-stress-strain-curve-stress-strain-diagram-definition\/\">curva tens\u00e3o-deforma\u00e7\u00e3o de<\/a> engenharia.\u00a0Isso corresponde \u00e0\u00a0<strong>tens\u00e3o m\u00e1xima <\/strong>que pode ser sustentado por uma estrutura em tens\u00e3o. A resist\u00eancia \u00e0 tra\u00e7\u00e3o final \u00e9 muitas vezes encurtada para \u201cresist\u00eancia \u00e0 tra\u00e7\u00e3o\u201d ou mesmo para \u201co m\u00e1ximo\u201d. Se esse estresse for aplicado e mantido, resultar\u00e1 em fratura. Muitas vezes, esse valor \u00e9 significativamente maior do que a tens\u00e3o de escoamento (at\u00e9 50 a 60 por cento a mais do que o escoamento para alguns tipos de metais). Quando um material d\u00factil atinge sua resist\u00eancia m\u00e1xima, ele sofre um estreitamento onde a \u00e1rea da se\u00e7\u00e3o transversal se reduz localmente. A curva tens\u00e3o-deforma\u00e7\u00e3o n\u00e3o cont\u00e9m tens\u00e3o superior \u00e0 resist\u00eancia \u00faltima. Mesmo que as deforma\u00e7\u00f5es possam continuar a aumentar, a tens\u00e3o geralmente diminui depois que a resist\u00eancia m\u00e1xima \u00e9 alcan\u00e7ada. \u00c9 uma propriedade intensiva; portanto, seu valor n\u00e3o depende do tamanho do corpo de prova. No entanto, depende de outros fatores, como a prepara\u00e7\u00e3o do corpo de prova,\u00a0<strong>temperatura<\/strong>\u00a0do ambiente de teste e do material.\u00a0<strong>A resist\u00eancia \u00e0 tra\u00e7\u00e3o final<\/strong>\u00a0varia de 50 MPa para um alum\u00ednio at\u00e9 3000 MPa para a\u00e7os de alta resist\u00eancia.<\/p>\n<h3>For\u00e7a de rendimento<\/h3>\n<p>O limite de escoamento da Liga de alum\u00ednio 6061 depende muito do temperamento do material, mas para o temperamento T6 \u00e9 de cerca de 240 MPa.<\/p>\n<p>O limite de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/strength\/stress-strain-curve-stress-strain-diagram\/yield-strength-yield-point\/\"><strong>escoamento<\/strong><\/a>\u00a0\u00e9 o ponto em uma\u00a0<a href=\"https:\/\/material-properties.org\/what-is-stress-strain-curve-stress-strain-diagram-definition\/\">curva tens\u00e3o-deforma\u00e7\u00e3o<\/a>\u00a0que indica o limite do comportamento el\u00e1stico e o comportamento pl\u00e1stico inicial.\u00a0<strong>For\u00e7a de rendimento <\/strong>ou tens\u00e3o de escoamento \u00e9 a propriedade do material definida como a tens\u00e3o na qual um material come\u00e7a a se deformar plasticamente, enquanto o limite de escoamento \u00e9 o ponto onde a deforma\u00e7\u00e3o n\u00e3o linear (el\u00e1stica + pl\u00e1stica) come\u00e7a.\u00a0Antes do limite de escoamento, o material se deformar\u00e1 elasticamente e retornar\u00e1 \u00e0 sua forma original quando a tens\u00e3o aplicada for removida.\u00a0Uma vez ultrapassado o limite de escoamento, alguma fra\u00e7\u00e3o da deforma\u00e7\u00e3o ser\u00e1 permanente e irrevers\u00edvel.\u00a0Alguns a\u00e7os e outros materiais apresentam um comportamento denominado fen\u00f4meno de limite de escoamento.\u00a0Os limites de escoamento variam de 35 MPa para um alum\u00ednio de baixa resist\u00eancia a mais de 1400 MPa para a\u00e7os de alta resist\u00eancia.<\/p>\n<h3>M\u00f3dulo de elasticidade de Young<\/h3>\n<p>O m\u00f3dulo de elasticidade de Young da Liga de alum\u00ednio 6061 \u00e9 de cerca de 69 GPa.<\/p>\n<p>O\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/strength\/hookes-law\/youngs-modulus-of-elasticity\/\">m\u00f3dulo de elasticidade de Young<\/a> \u00e9\u00a0o m\u00f3dulo de elasticidade para tens\u00f5es de tra\u00e7\u00e3o e compress\u00e3o no regime de elasticidade linear de uma deforma\u00e7\u00e3o uniaxial e geralmente \u00e9 avaliado por ensaios de tra\u00e7\u00e3o.\u00a0At\u00e9 uma tens\u00e3o limitante, um corpo ser\u00e1 capaz de recuperar suas dimens\u00f5es na remo\u00e7\u00e3o da carga.\u00a0As tens\u00f5es aplicadas fazem com que os \u00e1tomos em um cristal se movam de sua posi\u00e7\u00e3o de equil\u00edbrio.\u00a0Todos os\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/\">\u00e1tomos<\/a>\u00a0s\u00e3o deslocados na mesma quantidade e ainda mant\u00eam sua geometria relativa.\u00a0Quando as tens\u00f5es s\u00e3o removidas, todos os \u00e1tomos retornam \u00e0s suas posi\u00e7\u00f5es originais e nenhuma deforma\u00e7\u00e3o permanente ocorre.\u00a0De acordo com a\u00a0<strong><a href=\"https:\/\/material-properties.org\/what-is-hookes-law-definition\/\">lei de Hooke<\/a>,<\/strong>\u00a0a tens\u00e3o \u00e9 proporcional \u00e0 deforma\u00e7\u00e3o (na regi\u00e3o el\u00e1stica), e a inclina\u00e7\u00e3o \u00e9\u00a0<strong>o m\u00f3dulo de Young<\/strong>.\u00a0O m\u00f3dulo de Young \u00e9 igual \u00e0 tens\u00e3o longitudinal dividida pela deforma\u00e7\u00e3o.<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-27811\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/Hookes-law-equation.png\" alt=\"\" width=\"320\" height=\"164\" \/><\/a><\/p>\n<h3>Dureza da Liga 6061<\/h3>\n<p>A dureza Brinell da Liga de alum\u00ednio 6061 depende muito da t\u00eampera do material, mas para a t\u00eampera T6 \u00e9 de aproximadamente 105 MPa.<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/table-brinell-hardness-numbers.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-full wp-image-28044\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/table-brinell-hardness-numbers.png\" alt=\"N\u00famero de dureza Brinell\" width=\"288\" height=\"297\" \/><\/a><\/p>\n<p><strong>O teste de dureza Rockwell<\/strong>\u00a0\u00e9 um dos testes de dureza de indenta\u00e7\u00e3o mais comuns, que foi desenvolvido para testes de dureza.\u00a0Em contraste com o teste Brinell, o testador Rockwell mede a profundidade de penetra\u00e7\u00e3o de um penetrador sob uma grande carga (carga principal) em compara\u00e7\u00e3o com a penetra\u00e7\u00e3o feita por uma pr\u00e9-carga (carga menor).\u00a0A carga menor estabelece a posi\u00e7\u00e3o zero.\u00a0A carga principal \u00e9 aplicada e, em seguida, removida, mantendo a carga menor.\u00a0A diferen\u00e7a entre a profundidade de penetra\u00e7\u00e3o antes e depois da aplica\u00e7\u00e3o da carga principal \u00e9 usada para calcular o\u00a0<strong>n\u00famero de dureza Rockwell<\/strong>.\u00a0Ou seja, a profundidade de penetra\u00e7\u00e3o e a dureza s\u00e3o inversamente proporcionais.\u00a0A principal vantagem da dureza Rockwell \u00e9 sua capacidade de\u00a0<strong>exibir valores de dureza diretamente<\/strong>. O resultado \u00e9 um n\u00famero adimensional anotado como\u00a0<strong>HRA, HRB, HRC<\/strong>, etc., onde a \u00faltima letra \u00e9 a respectiva escala Rockwell.<\/p>\n<p>O teste Rockwell C \u00e9 realizado com um penetrador Brale (<strong>cone diamantado 120\u00b0<\/strong>) e uma carga principal de 150kg.<\/p>\n<h3>Exemplo: For\u00e7a<\/h3>\n<p>Suponha uma haste de pl\u00e1stico, que \u00e9 feita de Liga 6061. Esta haste de pl\u00e1stico tem uma \u00e1rea de se\u00e7\u00e3o transversal de 1 cm<sup>2<\/sup>.\u00a0Calcule a for\u00e7a de tra\u00e7\u00e3o necess\u00e1ria para atingir a resist\u00eancia \u00e0 tra\u00e7\u00e3o final para este material, que \u00e9: UTS = 290 MPa.<\/p>\n<p>Solu\u00e7\u00e3o:<\/p>\n<p><strong>A tens\u00e3o (\u03c3)<\/strong>\u00a0pode ser igualada \u00e0 carga por unidade de \u00e1rea ou \u00e0 for\u00e7a (F) aplicada por \u00e1rea de se\u00e7\u00e3o transversal (A) perpendicular \u00e0 for\u00e7a como:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-109284 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation-300x184.png\" alt=\"resist\u00eancia do material - equa\u00e7\u00e3o\" width=\"300\" height=\"184\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation-300x184.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation.png 380w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>portanto, a for\u00e7a de tra\u00e7\u00e3o necess\u00e1ria para atingir a resist\u00eancia \u00e0 tra\u00e7\u00e3o final \u00e9:<\/p>\n<p><strong>F<\/strong> = UTS x A = 290 x 10<sup>6<\/sup>\u00a0x 0,0001 =\u00a0<strong>29000 N<\/strong><\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Resist\u00eancia dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/strength-of-materials-tensile-yield\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108070 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Strength-of-Materials-300x182.png\" alt=\"Tabela de Materiais - Resist\u00eancia dos Materiais\" width=\"300\" height=\"182\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Elasticidade dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/elasticity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108080 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Elasticity-of-Materials-300x185.png\" alt=\"Tabela de Materiais - Elasticidade dos Materiais\" width=\"300\" height=\"185\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Dureza dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/hardness-of-materials-brinell-mohs\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108085 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Hardness-of-Materials-300x182.png\" alt=\"Tabela de Materiais - Dureza dos Materiais\" width=\"300\" height=\"182\" \/><\/a>\u00a0 <\/p><\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Propriedades T\u00e9rmicas da Liga 6061<\/h2>\n<p><strong>As propriedades t\u00e9rmicas<\/strong>\u00a0dos materiais referem-se \u00e0 resposta dos materiais \u00e0s mudan\u00e7as em sua\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/<a href=\"https:\/\/modern-physics.org\/thermodynamics\/\">thermodynamics<\/a>\/thermodynamic-properties\/what-is-temperature-physics\/&#8221;>temperatura<\/a>\u00a0e \u00e0 aplica\u00e7\u00e3o de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-in-physics-definition-of-heat\/\">calor<\/a>.\u00a0\u00c0 medida que um s\u00f3lido absorve\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/<a href=\"https:\/\/modern-physics.org\/thermodynamics\/\">thermodynamics<\/a>\/what-is-energy-physics\/&#8221;>energia<\/a>\u00a0na forma de calor, sua temperatura aumenta e suas dimens\u00f5es aumentam.\u00a0Mas\u00a0<strong>materiais diferentes reagem<\/strong>\u00a0\u00e0 aplica\u00e7\u00e3o de calor de\u00a0<strong>forma diferente<\/strong>.<\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/thermal-properties-of-materials\/specific-heat-capacity-of-materials\/\">Capacidade de calor<\/a>,\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/thermal-properties-of-materials\/coefficient-of-thermal-expansion-of-materials\/\">expans\u00e3o<\/a>\u00a0t\u00e9rmica e\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\">condutividade t\u00e9rmica<\/a>\u00a0s\u00e3o propriedades que s\u00e3o frequentemente cr\u00edticas no uso pr\u00e1tico de s\u00f3lidos.<\/p>\n<h3>Ponto de fus\u00e3o da Liga 6061<\/h3>\n<p>O ponto de fus\u00e3o da Liga de alum\u00ednio 6061 \u00e9 de cerca de 600\u00b0C.<\/p>\n<p>Em geral, a <strong>fus\u00e3o<\/strong> \u00e9 uma\u00a0<strong>mudan\u00e7a de fase<\/strong> de uma subst\u00e2ncia da fase s\u00f3lida para a l\u00edquida.\u00a0O\u00a0<a href=\"https:\/\/material-properties.org\/melting-point-of-chemical-elements\/\"><strong>ponto de fus\u00e3o<\/strong><\/a> de uma subst\u00e2ncia \u00e9 a temperatura na qual essa mudan\u00e7a de fase ocorre.\u00a0O\u00a0<strong>ponto de fus\u00e3o <\/strong>tamb\u00e9m define uma condi\u00e7\u00e3o na qual o s\u00f3lido e o l\u00edquido podem existir em equil\u00edbrio.<\/p>\n<h3>Condutividade T\u00e9rmica da Liga 6061<\/h3>\n<p>A condutividade t\u00e9rmica da Liga de alum\u00ednio 6061 \u00e9 150 W\/(mK).<\/p>\n<p>As caracter\u00edsticas de transfer\u00eancia de calor de um material s\u00f3lido s\u00e3o medidas por uma propriedade chamada <a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\"><strong>condutividade t\u00e9rmica<\/strong><\/a>, k (ou \u03bb), medida em\u00a0<strong>W\/mK<\/strong>.\u00a0\u00c9 uma medida da capacidade de uma subst\u00e2ncia de transferir calor atrav\u00e9s de um material por\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conduction-heat-conduction-definition\/\">condu\u00e7\u00e3o<\/a>. Observe que\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/what-is-fouriers-law-of-thermal-conduction-definition\/\"><strong>a lei de Fourier<\/strong><\/a>\u00a0se aplica a toda mat\u00e9ria, independentemente de seu estado (s\u00f3lido, l\u00edquido ou gasoso), portanto, tamb\u00e9m \u00e9 definida para l\u00edquidos e gases.<\/p>\n<p>A <a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\"><strong>condutividade t\u00e9rmica<\/strong><\/a>\u00a0da maioria dos l\u00edquidos e s\u00f3lidos varia com a temperatura.\u00a0Para vapores, tamb\u00e9m depende da press\u00e3o.\u00a0No geral:<\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2017\/10\/thermal-conductivity-definition.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-20041\" src=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2017\/10\/thermal-conductivity-definition.png\" alt=\"condutividade t\u00e9rmica - defini\u00e7\u00e3o\" width=\"225\" height=\"75\" \/><\/a><\/p>\n<p>A maioria dos materiais s\u00e3o quase homog\u00eaneos, portanto, geralmente podemos escrever\u00a0\u00a0<strong>k = k (T)<\/strong>.\u00a0Defini\u00e7\u00f5es semelhantes est\u00e3o associadas a condutividades t\u00e9rmicas nas dire\u00e7\u00f5es y e z (ky, kz), mas para um material isotr\u00f3pico a condutividade t\u00e9rmica \u00e9 independente da dire\u00e7\u00e3o de transfer\u00eancia, kx = ky = kz = k.<\/p>\n<h3>Exemplo: c\u00e1lculo de transfer\u00eancia de calor<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/6061-Alloy-Thermal-Conductivity.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-109657 alignright\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/6061-Alloy-Thermal-Conductivity.png\" alt=\"Liga 6061 - Condutividade T\u00e9rmica\" width=\"368\" height=\"656\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/6061-Alloy-Thermal-Conductivity.png 368w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/6061-Alloy-Thermal-Conductivity-168x300.png 168w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/a>A condutividade t\u00e9rmica \u00e9 definida como a quantidade de calor (em watts) transferida atrav\u00e9s de uma \u00e1rea quadrada de material de determinada espessura (em metros) devido a uma diferen\u00e7a de temperatura.\u00a0Quanto menor a condutividade t\u00e9rmica do material, maior a capacidade do material de resistir \u00e0 transfer\u00eancia de calor.<\/p>\n<p>Calcule a taxa de <u>fluxo de calor<\/u> atrav\u00e9s de uma parede de 3 m x 10 m de \u00e1rea (A = 30 m<sup>2<\/sup>).\u00a0A parede tem 15 cm de espessura (L<sub>1<\/sub>) e \u00e9 feita de Liga 6061 com\u00a0<u>condutividade t\u00e9rmica<\/u> de k<sub>1<\/sub>\u00a0= 150 W\/mK (isolante t\u00e9rmico ruim).\u00a0<u>Suponha que as temperaturas<\/u> interna e externa\u00a0\u00a0sejam 22 \u00b0C e -8 \u00b0C, e os <u>coeficientes de transfer\u00eancia de calor por convec\u00e7\u00e3o<\/u> nos lados interno e externo sejam h<sub>1<\/sub> = 10 W\/m<sup>2<\/sup>K e h<sub>2<\/sub> = 30 W\/m<sup>2<\/sup>K, respectivamente.\u00a0Note-se que estes coeficientes de convec\u00e7\u00e3o dependem especialmente das condi\u00e7\u00f5es ambientais e interiores (vento, humidade, etc.).<\/p>\n<p>Calcule o fluxo de\u00a0<strong>calor (perda de calor)<\/strong>\u00a0atrav\u00e9s desta parede.<\/p>\n<p><strong>Solu\u00e7\u00e3o:<\/strong><\/p>\n<p>Como foi escrito, muitos dos processos de transfer\u00eancia de calor envolvem sistemas compostos e at\u00e9 envolvem uma combina\u00e7\u00e3o de <u>condu\u00e7\u00e3o<\/u> e\u00a0<u>convec\u00e7\u00e3o<\/u>.\u00a0Com esses sistemas compostos, muitas vezes \u00e9 conveniente trabalhar com um <strong><u>coeficiente global de transfer\u00eancia de calor<\/u><\/strong>,\u00a0<strong>conhecido <\/strong>como\u00a0<strong>fator U.\u00a0<\/strong>O fator U \u00e9 definido por uma express\u00e3o an\u00e1loga \u00e0 <a href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/newtons-law-of-cooling\/\"><strong>lei de resfriamento de Newton<\/strong><\/a>:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-medium wp-image-109295\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling-300x131.png\" alt=\"C\u00e1lculo da transfer\u00eancia de calor - lei de resfriamento de Newton\" width=\"300\" height=\"131\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling-300x131.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling.png 446w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>O <strong>coeficiente global de transfer\u00eancia de calor<\/strong> est\u00e1 relacionado com a <a href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/\">resist\u00eancia t\u00e9rmica total<\/a> e depende da geometria do problema.<\/p>\n<p>Assumindo a transfer\u00eancia de calor unidimensional atrav\u00e9s da parede plana e desconsiderando a radia\u00e7\u00e3o, o <strong>coeficiente global de transfer\u00eancia de calor<\/strong> pode ser calculado como:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-medium wp-image-109300\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor-300x187.png\" alt=\"C\u00e1lculo de transfer\u00eancia de calor - fator U\" width=\"300\" height=\"187\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor-300x187.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor.png 478w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>O\u00a0<strong>coeficiente global de transfer\u00eancia de calor <\/strong>\u00e9 ent\u00e3o: U = 1 \/ (1\/10 + 0,15\/150 + 1\/30) = 7,44 W\/m<sup>2<\/sup>K<\/p>\n<p>O fluxo de calor pode ent\u00e3o ser calculado simplesmente como: q = 7,44 [W\/m<sup>2<\/sup>K] x 30 [K] = 223,33 W\/m<sup>2<\/sup><\/p>\n<p>A perda total de calor atrav\u00e9s desta parede ser\u00e1:\u00a0<strong>q<sub>perda<\/sub> <\/strong>= q .\u00a0A = 223,33 [W\/m<sup>2<\/sup>] x 30 [m<sup>2<\/sup>] =\u00a0<strong>6699,75 W<\/strong><\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Ponto de fus\u00e3o dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/melting-point-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108050 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Metling-Point-300x183.png\" alt=\"Tabela de Materiais - Ponto de Fus\u00e3o\" width=\"300\" height=\"183\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Condutividade T\u00e9rmica dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/thermal-conductivity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108055 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Thermal-Conductivity-300x180.png\" alt=\"Tabela de Materiais - Condutividade T\u00e9rmica\" width=\"300\" height=\"180\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Capacidade de Calor dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/heat-capacity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108063 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Heat-Capacity-300x179.png\" alt=\"Tabela de Materiais - Capacidade de Calor\" width=\"300\" height=\"179\" \/><\/a><\/p>\n<h3 style=\"text-align: center;\"><\/h3>\n<\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sobre a Liga 6061 Em geral,\u00a0as ligas de alum\u00ednio da s\u00e9rie 6000\u00a0s\u00e3o ligadas com magn\u00e9sio e sil\u00edcio.\u00a0A liga 6061 \u00e9 uma das ligas mais utilizadas na s\u00e9rie 6000.\u00a0Possui boas propriedades mec\u00e2nicas, \u00e9 f\u00e1cil de usinar, \u00e9 sold\u00e1vel e pode ser endurecido por precipita\u00e7\u00e3o, mas n\u00e3o com as altas resist\u00eancias que 2000 e 7000 podem alcan\u00e7ar.\u00a0Tem &#8230; <a title=\"Liga 6061 &#8211; Densidade &#8211; Resist\u00eancia &#8211; Dureza &#8211; Ponto de Fus\u00e3o\" class=\"read-more\" href=\"https:\/\/material-properties.org\/pt-br\/liga-6061-densidade-resistencia-dureza-ponto-de-fusao\/\">Ler mais&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - 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