Materiales.Compuestos at 14:14, 20 September 2022

2022-09-20T14:14:22Z

Scipediacontent at 13:25, 29 April 2022

2022-04-29T13:25:43Z

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Scipediacontent: Scipediacontent moved page Draft Content 930070899 to Perez-Galmes et al 2017a

2022-03-31T12:57:47Z

Scipediacontent moved page Draft Content 930070899 to Perez-Galmes et al 2017a

Scipediacontent: Created page with "== Abstract == In order to obtain Mode II fracture toughness of unidirectional fiber composite materials, the End-Loaded Split (ELS) has enjoyed great success because of its..."

2022-03-31T12:57:45Z

Created page with "== Abstract == In order to obtain Mode II fracture toughness of unidirectional fiber composite materials, the End-Loaded Split (ELS) has enjoyed great success because of its..."

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== Abstract ==

In order to obtain Mode II fracture toughness of unidirectional fiber composite materials, the End-Loaded Split (ELS) has enjoyed great success because of its higher stability. As a result, crack growth initiation and propagation values are obtained, the latter being especially used in interlaminar progressive damage models. The propagation values must be obtained when the Failure Process Zone (FPZ) has completely developed. In delamination tests of unidirectional composites, such as those contemplated in ISO 15114, the dimension of the FPZ can be neglected against the rest of the dimensions of the specimen, whereby the self-similar crack growth is reached just after the initiation of the crack propagation.
However, in adhesive joints, the dimension of the FPZ increases significantly due to the plasticity of the adhesives. And even it can be larger than the entire length reserved for crack propagation. When this occurs, only initiation values are obtained, always inferior to the values of propagation, being these values too conservative to reproduce the behaviour of the joint.
In this paper we present a methodology to define the configuration of the ELS test and the specimen dimensions required to obtain propagation results in adhesive joints. The methodology defined is based on two criteria that take into account the length of the FPZ and the stability of the test. As a result, a domain of validity of the test is obtained, which, for a certain type of adhesive and specimen configuration, it indicated is there will be propagation or not.

== Full document ==
<pdf>Media:Draft_Content_930070899native-articles-56.pdf</pdf>

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 ==1 Introducción==
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-|  colspan='4'  style="border-bottom: 2pt solid black;text-align: center;"|<span style="text-align: center; font-size: 75%;">'''Tabla 1.''' Propiedades cohesivas consideradas en el modelo analítico para los diferentes los casos de estudio.</span>
+|  colspan='4'  style="border-bottom: 2pt solid black;text-align: center;"|<span style="text-align: center; font-size: 75%;">'''Tabla 1.''' Propiedades cohesivas consideradas en el modelo analítico para los diferentes los casos de estudio</span>
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 |  style="border-top: 2pt solid black;border-bottom: 1pt solid black;text-align: right;"|
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 Como resultado del análisis de los dos casos se han obtenido las correspondientes curvas <math display="inline">P-</math><math>\delta</math>  con las que se ha definido el criterio de estabilidad. La figura 3 ejemplifica la curva <math display="inline">P-</math><math>\delta</math>  obtenida en dos casos de estudio de igual geometría ( <math display="inline">H=</math> 6 mm y <math display="inline">L=</math> 200 mm) y tenacidad a la fractura ( <math display="inline">{G}_{IIc}</math> = 3 J/m<sup>2</sup>)pero diferente tensión última a cortante ( <math display="inline">{\tau }_{sh}</math>).
-<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:Perez-Galmes_et_al_2017a-image7.png|centre|600x600px]]<span style="text-align: center; font-size: 75%;">'''Figura 3.''' Curva </span> <math display="inline">P-</math><math>\delta</math> <span style="text-align: center; font-size: 75%;"> de los casos de estudio de diferente </span> <math display="inline">{\tau }_{sh}</math><span style="text-align: center; font-size: 75%;">y misma geometría (</span> <math display="inline">H\,</math> <span style="text-align: center; font-size: 75%;">= 6 mm y </span> <math display="inline">L</math><span style="text-align: center; font-size: 75%;"> =  200 mm) y tenacidad a la fractura (</span> <math display="inline">{G}_{IIc}</math><span style="text-align: center; font-size: 75%;"> = 3 J/m2).</span></div>
- [[Image:Perez-Galmes_et_al_2017a-image7.png|600px]] <span style="text-align: center; font-size: 75%;">'''Figura 3.''' Curva </span> <math display="inline">P-</math><math>\delta</math> <span style="text-align: center; font-size: 75%;"> de los casos de estudio de diferente </span> <math display="inline">{\tau }_{sh}</math><span style="text-align: center; font-size: 75%;">y misma geometría (</span> <math display="inline">H\,</math> <span style="text-align: center; font-size: 75%;">= 6 mm y </span> <math display="inline">L</math><span style="text-align: center; font-size: 75%;"> =  200 mm) y tenacidad a la fractura (</span> <math display="inline">{G}_{IIc}</math><span style="text-align: center; font-size: 75%;"> = 3 J/m2).</span></div>
 Es importante mencionar que, en el primer caso de estudio, las <math display="inline">{l}_{FPZ}</math> han resultado ser mayores que en el segundo caso debido a que la tensión cortante última ( <math display="inline">{\tau }_{sh}</math>) es inferior.
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 La figuras 4 y 5 ejemplifican el rango de trabajo de los dos casos de estudio para probetas de 3 mm y 6 mm de grosor ( <math display="inline">H</math>). En cada gráfico se representa un rango de longitudes iniciales de grieta ( <math display="inline">{a}_{0}</math>) y longitudes de voladizo ( <math display="inline">L</math>) entre 0 y 500 mm obteniendo, para cada grosor de probeta una superficie de trabajo,  intersección de los tres criterios limitadores propuestos en la sección 2.
+[[File:Perez-Galmes_et_al_2017a-image8.png|centre|600x600px]]
-[[Image:Perez-Galmes_et_al_2017a-image8.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">
 <span style="text-align: center; font-size: 75%;">'''Figura 4.''' Representación de los límites de trabajo para el caso 1 de probetas de 3 mm y 6 mm de grosor (</span> <math display="inline">H</math><span style="text-align: center; font-size: 75%;">). Las configuraciones iniciales de probeta ELS que cumplen los tres criterios limitadores de este ensayo se comprenden dentro de las zonas de trabajo.</span></div>
+[[File:Perez-Galmes_et_al_2017a-image9.png|centre|600x600px]]
-[[Image:Perez-Galmes_et_al_2017a-image9.png|600px]]
 <div class="center" style="width: auto; margin-left: auto; margin-right: auto;">

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Perez-Galmes et al 2017a - Revision history

Materiales.Compuestos at 14:14, 20 September 2022

Scipediacontent at 13:25, 29 April 2022

Scipediacontent: Scipediacontent moved page Draft Content 930070899 to Perez-Galmes et al 2017a

Scipediacontent: Created page with "== Abstract == In order to obtain Mode II fracture toughness of unidirectional fiber composite materials, the End-Loaded Split (ELS) has enjoyed great success because of its..."