Botana-Galvin et al 2019a - Revision history

Materiales.Compuestos at 19:28, 30 October 2022

2022-10-30T19:28:49Z

Materiales.Compuestos at 19:27, 30 October 2022

2022-10-30T19:27:16Z

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Scipediacontent at 11:16, 7 May 2022

2022-05-07T11:16:37Z

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Scipediacontent: Scipediacontent moved page Draft Content 884702521 to Botana-Galvin et al 2019a

2022-03-31T19:01:14Z

Scipediacontent moved page Draft Content 884702521 to Botana-Galvin et al 2019a

Scipediacontent: Created page with "== Abstract == There is an increasing trend towards the substitution of mechanical joining by adhesive bonding in carbon fibre elements (CFRP) in aeronautical sector. However..."

2022-03-31T19:01:11Z

Created page with "== Abstract == There is an increasing trend towards the substitution of mechanical joining by adhesive bonding in carbon fibre elements (CFRP) in aeronautical sector. However..."

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== Abstract ==

There is an increasing trend towards the substitution of mechanical joining by adhesive bonding in carbon fibre elements (CFRP) in aeronautical sector. However, it is mandatory to perform a previous step of surface preparation in order to obtain the best adhesive properties to the surface. There are some certified superficial preparation methods by the aeronautical sector, being shot peening, grinding and peel-ply the most used ones. All of them have the disadvantage of not being automatable. Hence, new potentially automatable methods for surface activation are being studied.
In this work it has been studied the use of UV laser radiation as a surface activation method previous to adhesive bonding, and its behaviour has been compared to peel-ply activated samples. To this end, an advanced surface characterization has been performed, by means of surface free energy determination, surface chemical composition determination by XPS measurement, surface roughness and morphology observation with SEM. Mode I fracture toughness test have been performed for all surface activation methods.
The obtained results show that adhesive bonding of UV laser treated samples have mode I fracture toughness comparable values to those obtained for peel-ply and peel-ply plus grinding samples. Furthermore, all the failure modes observed are accepted by the sector normative. This makes that UV laser surface preparation could be considered as an alternative for certified surface method of CFRPs.

== Full document ==
<pdf>Media:Draft_Content_884702521native-articles-242.pdf</pdf>

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 Las condiciones de procesado utilizadas fueron determinadas en una etapa previa a este trabajo, cuyos resultados están en revisión. En la Tabla 1 quedan recogidas estas condiciones de procesado.
-'''Tabla 1.''' Parámetros de procesado láser utilizados
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 En la Tabla 2 se incluyen los valores de energía libre superficial determinados para la muestra sin tratar y los dos tipos de tratamientos superficiales realizados.
-'''Tabla 2.''' Energía libre superficial
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 <span style="text-align: center; font-size: 75%;">'''Figura 1. '''Espectros surveys de muestra sin tratamiento, tratada con peel-ply y procesada con láser.</span></div>
-'''Tabla 3. '''Porcentajes atómicos de los elementos identificados en las muestras. Valores obtenidos a partir de los espectros XPS de la Figura 1
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 Los valores de rugosidad superficial en términos de Ra medidos para las tres muestras estudiadas están recogidos en la Tabla 4.
-'''Tabla 4.''' Valores de rugosidad superficial (Ra) correspondientes a las muestras que se indican
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 [[File:Botana-Galvin_et_al_2019a-chart1.svg|centre|600x600px]]
-'''Figura 5. '''Valores de la tenacidad a la fractura interlamnar en modo I en función del tratamiento superficial aplicado.
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 En la Figura 5 se observa que los valores de tenacidad a la fractura interlaminar en modo I son comparables para los dos tipos de tratamientos superficiales estudiados, siendo incluso ligeramente superior en el caso del láser. Ambos valores están por encima del valor mínimo aceptable establecido en la especificación del material, 550 J·m<sup>2</sup>.

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