Materiales.Compuestos at 20:56, 13 September 2022

2022-09-13T20:56:28Z

Scipediacontent at 13:15, 29 April 2022

2022-04-29T13:15:33Z

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Scipediacontent: Scipediacontent moved page Draft Content 438767095 to Muedra Lopez 2017a

2022-03-31T12:56:45Z

Scipediacontent moved page Draft Content 438767095 to Muedra Lopez 2017a

Scipediacontent: Created page with "== Abstract == The present work is part of the characterization of glass fiber composites elaborated with a novel vinylester-urethane resin, with addition of poly for use in..."

2022-03-31T12:56:43Z

Created page with "== Abstract == The present work is part of the characterization of glass fiber composites elaborated with a novel vinylester-urethane resin, with addition of poly for use in..."

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== Abstract ==

The present work is part of the characterization of glass fiber composites elaborated with a novel vinylester-urethane resin, with addition of poly for use in reinforcing materials for concrete, as a passive reinforcement or as a reinforcement for structures in use, as these resins have a higher Resistance to chemical agents, basics and vapors along with a lower exotherm facilitating the manufacture of thick laminates.Within Mode II fracture mechanics, until this 2014 there was no standard that would collect a procedure to quantify GIIC. Davies through the European Structural Integrity Society (ESIS) issued a mode II test protocol in 1992 known as ENF (End Notch Flexure) [1]ASTM D7905-14 encompasses a fairly complex procedure in which the basis for the characterization of shear fracture toughness in mode II using the final notch flexure (ENF) test is laid.This paper aims to verify the main differences between this classical procedure and the method of this standard to verify their similarities.For this purpose, a mechanical pre-characterization of the reinforced resin is carried out with high-grade fabric (780 g/cm2) with glass fiber E as well as a thinner carbon fiber composite. This characterization is performed by ENF bending tests, and the procedure of the new ASTM D-7905 standard.
 
[1] ASTM D5528-01, “Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites”, American Society for Testing and Materials, 2001.

== Full document ==
<pdf>Media:Draft_Content_438767095native-articles-49.pdf</pdf>

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 ==1 Introducción ==
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 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figura 1.''' Fragmentos de los haces de fibra del tejido</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figura 1.''' Fragmentos de los haces de fibra del tejido.</span></div>
 La geometría utilizada para realizar los ensayos de fractura en modo II, ha sido la planteada por Carlsson et al. [6], tal y como se muestra en la Figura 2, en un ensayo de flexión a tres puntos en el que la grieta interlaminar preexistente es forzada a propagarse por los esfuerzos cortantes que aparecen en las dos superficies de la grieta. Estos cortantes se generan cuando se carga la probeta y aparece un movimiento relativo entre ambas superficies de la grieta, causando la propagación de ésta por cizalladura o en modo II.
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 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
-<span style="text-align: center; font-size: 75%;">'''Figura 2. '''Esquema del ensayo ''End Notched Flexure ''(ENF)</span></div>
+<span style="text-align: center; font-size: 75%;">'''Figura 2. '''Esquema del ensayo ''End Notched Flexure ''(ENF).</span></div>
 La fibra de carbono viene incorporada en el prepreg base epoxi denominado HexPly®F593, de curado modificado a 177 ° C, con flujo muy bajo para aplicaciones de tejidos y cintas de carbono que proporciona excelentes propiedades resistentes, de configuración simétrica a 0º, y consiguiendo un laminado de espesor de 2.0±0.2 mm
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 Para calcular el parámetro m se representa gráficamente C frente a a3 y se ajustan los puntos obtenidos mediante regresión lineal por mínimos cuadrados. La pendiente de esta será el parámetro m buscado.
-<div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
+<div class="center" style="width: auto; margin-left: auto; margin-right: auto;">[[File:Muedra_Lopez_2017a-image8-c.png|centre|492x492px]]<span style="text-align: center; font-size: 75%;">'''Figura 4'''</span> <span style="text-align: center; font-size: 75%;">Cálculo de flexibilidad.</span></div>
- [[Image:Muedra_Lopez_2017a-image8-c.png|600px]] <span style="text-align: center; font-size: 75%;">'''Figura 4'''</span> <span style="text-align: center; font-size: 75%;">Cálculo de flexibilidad.</span></div>
 ====3.2.1 Obtención de los valores de tenacidad a fractura por cortante====

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Muedra Lopez 2017a - Revision history

Materiales.Compuestos at 20:56, 13 September 2022

Scipediacontent at 13:15, 29 April 2022

Scipediacontent: Scipediacontent moved page Draft Content 438767095 to Muedra Lopez 2017a

Scipediacontent: Created page with "== Abstract == The present work is part of the characterization of glass fiber composites elaborated with a novel vinylester-urethane resin, with addition of poly for use in..."