Presentación UTN Extensometria 2012

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Presentación UTN Extensometria 2012

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Mediciones y ensayos industriales. Apunte del ingeniero Diego Fernandez Moreno. Extensómetros, tipos, cálculos, instalación.

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MEDICIONES Y ENSAYOS INDUSTRIALES Área Mecánica y Resistencia de Materiales

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MEDICIÓN DE DEFORM EXTENS

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MEDICION DE DEFORMACIONES DEFORMACIONES EXTENSOMETRÍA 

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Consideraciones generales Sign up to vote on this title

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Concepto y definición de extensómetro: extensómetro: Todo elemento elemento mecánico sufre cambios Useful  Not useful  sobre forma y dimensiones debido a las solicitaciones que él se ejercen. Estos ca para los materiales materiales metálicos, son en general tan pequeños que muchas veces p

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Consideraciones generales Sign up to vote on this title

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Concepto y definición de extensómetro: extensómetro: Todo elemento elemento mecánico sufre cambios Useful  Not useful  sobre forma y dimensiones debido a las solicitaciones que él se ejercen. Estos ca para los materiales materiales metálicos, son en general tan pequeños que muchas veces p

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De todas ellas son las deformaciones especificas lineales ( ε) las que presentan presentan la importancia por razones razones teóricas (las leyes básicas básicas de las teorías matemáticas matemáti  cas d Sign up to vote on this title elasticidad y de la plasticidad se expresan en función de ε y de ϒ) y prácticas (las Useful  Not useful solicitaciones donde estas deformaciones deformaciones lineales definen el cambio de forma y dimensiones, o sea en tracción y compresión, se presentan presentan frecuentemente tant

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Unidades: Previamente distinguiremos entre, alargamiento (Δl): variación de la distancia en  Sign up to vote on this title dos puntos de la pieza y deformación (ε) o alargamiento específico que es el coc useful  Useful  Not entre la variación de longitud ( Δl) y la longitud inicial entre los puntos de refer o sea que

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Aplicaciones: Tres son los campos de aplicación básicos de los extensómetros: Sign up to vote on this title 

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a) Estudiar el comportamiento del material bajo estados simples de tensión,

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Características básicas: Sign up to vote on this title

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a) Longitud de medición (lext o l0): es la longitud de la parte activa o sensible a l deformaciones del extensómetro.

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Propiedades de un extensómetro ideal: son las que definen a un extensómetro perfecto y constituirán la referencia para juzgar las bondades de un extensómetr  1) Gran sensibilidad 2) Sencillez de manejo


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10) Estable en condiciones de humedad elevada 11) Insensibilidad a las variaciones de temperaturaSign durante el on ensayo* up to vote this title 12) Inmune a la vibración

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13) Ausencia de juegos, zonas muertas y corrimientos de calibración en el tiemp

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Clasificación de los extensómetros Sign up to vote on this title

Por su principio de funcionamiento: Ø

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MECÁNICOS: son de uso casi exclusiv para determinaciones bajo cargas est

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Por su precisión (ASTM E 83): Sign up to vote on this title

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Extensómetros Mecánicos Amplifican mecánicamente el alargamiento (Δl).


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Generalidades: se basan en la amplificación mecánica desplazamiento relativo e

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Clasificación: según el tipo de sistema amplificador tendremos: Sign up to vote on this title

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a) de palanca simple: se basan en que, en una palanca de brazos muy desiguale  Useful  Not useful pequeño movimiento en el lado corto le corresponde un movimiento mucho en el otro extremo. Ejemplo ext. de Martens-Krupp-Kennedy (Lab. Otto Krau

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Ventajas e inconvenientes: Entre les primeras podemos mencionar:


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a) Robustez y sencillez de uso lo que da a sus lecturas un alto grado de confia

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Entre los inconvenientes principales podemos mencionar:

 a) La longitud de medición no puede ser muy pequeña lovote queonimpide Sign up to this title su uso en de rápida variación de la deformación.  Useful  Not useful

b) Su tamaño y su forma impide agruparlos en las proximidades de un punto pa

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Aplicación: los extensómetros mecánicos encuentran su principal aplicación en la determina  Sign up to vote on this title de los limites convencionales ( σ 0,2 o σ0,5) de los materiales metálicos y también Not useful  Useful  los hallar valores aproximados del módulo de elasticidad (E) y de limites de la zo pequeñas deformaciones (σp o σ0,01). Sin embargo el extensómetro de Huggenbe

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Extensómetros Ópticos Sign up to vote on this title

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Princípio de funcionamento: difracción de una luz monocromática (laser) 

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Test specime an extensom

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Extensómetro LVDT (transformador diferencial de variación lineal)


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EXTENSÓMETROS ELÉCTRICOS DE RESISTENCIA VARIABLE Ó STRAIN GAGES




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Factor de calibre: Para estas galgas hay proporcionalidad entre la variación relati la resistencia del calibre (ΔR/R) Y la deformación especifica media ( ε), enel área vote on this title del calibre y en la dirección longitudinal o principalSign de up la togalga. El efecto de la Useful Not  del calibre  ( εuseful deformación en la dirección transversal a la principal t) es equivalen una deformación longitudinal de magnitud C. εt, donde C recibe el nombre de

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Ecuación fundamental de los calibres eléctricos: Sign up to vote on this title

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Dado que K lo proporciona el fabricante de la galga se deduce que las medicione Not useful  Useful Ia deformación variación relativa de resistencia nos permitirán determinar espec en la dirección del eje de la galga.

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Propiedades fundamentales:

 eléct Se obtienen a partir del análisis de la ecuación fundamental de los calibres Sign up to vote on this title

 Useful  Not useful a) En los extensómetros eléctricos el valor leído (ΔR/R) es directamente propor a la deformación especifica (ε), a diferencia de los extensómetros mecánicos

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Clasificación: Sign up to vote on this title Por su forma constructiva: distinguiremos dos tipos básicos

a) De filamento o de alambre

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Galgas de alambre: el elemento sensible es un hilo conductor metálico de diáme entre 15 y 25 μm encolado sobre un soporte aislante de resina epóxica, poliés  Sign up to vote on this title material análogo. Para ofrecer la resistencia (R) conveniente para las mediciones Not useful  Useful repliegues. 350 Ohm) dentro de un área reducida, el hilo presenta varios

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Por el número de elementos: según la cantidad de calibres que comparten el mi soporte aislante tendremos las galgas simples compuestas por un solo calibre yl  Sign up to vote on this title múltiples o rosetas que constaran de 2, 3 o mas elementos. Describiremos breve  Useful  Not useful los tipos mas utilizados en la practica:

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c) Roseta rectangular: si las direcciones principales son desconocidas se requi tres medidas independientes para definir el estado de deformación en  un pu Sign up to vote on this title por esto que debe usarse una roseta de tres elementos siendo generalmente  Useful llegar  Not conveniente el tipo rectangular, tanto que podríamos a useful decir que es la herramienta básica del análisis de tensión puntual.

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Puente de Wheatstone: es un circuito pasivo formado por cuatro resistencias. La tensión de alimentación V se aplica a dos vértices opuestos, y on enthis lostitle dos  restan Sign up to vote recoge la tensión de salida E.  Useful  Not useful El puente se equilibra inicialmente (E=0) y durante el ensayo se desequilibrara de las deformaciones que actúan sobre las galgas que constituyen una o mas de las

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Clasificación de las configuraciones del puente: 1) Numero de ramas ocupadas por galgas a) Puente simple


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Las galgas según función se clasifican en: Sign up to vote on this title

ü

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Galgas activas: aquellas colocadas en la pieza  o estructura a analizar en una Useful  Not useful dirección donde la deformación es no nula.

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Puente simple Sign up to vote on this title

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Selección de la galga: 1) Material conductor: Ø

Constantan para uso general


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Montaje de las galgas: Consta de 5 fases sucesivas: 1) Preparación de la superficie; 2) Pegado del calibre;


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Preparación de la superficie: a) Limpia (libre de grasa, suciedad, contaminantes químicos, etc.);  Sign up to vote on this title b) De rugosidad apropiada; c) Neut a (pH a

. 7);

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Pegado del calibre:

 Esta operación podemos subdividirla también en varias etapas. Elthis procedimiento Sign up to vote on title pegado depende del tipo de galga y fundamentalmente del tipo deuseful adhesivo por  Useful  Not solo daremos ciertas reglas generales debiéndose consultar con especial cuidado recomendaciones del fabricante del pegamento antes de encarar una aplicación

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Ø


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curado del adhesivo: también depende del tipo de adhesivo pero en general e necesario aplicar cierta presión y luego esperar el curado o endurecimiento qu  Sign up to vote on this title muchos casos exige un calentamiento moderado (50 °C - 200°C). Este curado s Useful  Not useful extiende desde algunos minutos (cianocrilatos)  hasta 48 hs.

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Soldado de los terminales:

 La mayoría de las galgas no están diseñadas para ser eléctricamente Signconectadas up to vote on this title forma directa. En astas casos junto con el calibre se Usefula la Not useful una peque paga probeta de terminales separada unos mm de la galga. Una vez concluido el pegado se su esos terminales los alambres de conexión mediante un soldador de baja potenci

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Comprobación: ciertos controles mínimos permiten detectar la mayoría de las ga instaladas defectuosamente.  Sign up to vote on this title

de Useful buscando en a) inspección ocular: se realiza con una lupa  gran aumento,  Not useful especial bolsas de aire o zonas sin adherir en las esquinas y bordes de la restos de soldadura o fundente, etc.

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Protección:

 Pueden obtenerse lecturas de deformación falsas oSign erráticas up to votedurante on this titleel ensayo p efecto de la humedad, ataque químico o daño mecánico luego de la  Usefulproducido  Not useful instalación. Por ello la galga y los terminales de conexión se protegen con una ca cuyas características son función de la duración prevista para la instalación y en

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Presentación UTN Extensometria 2012

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