Townsend et al 2018a - Revision history

Materiales.Compuestos at 18:20, 29 September 2022

2022-09-29T18:20:47Z

Materiales.Compuestos at 18:13, 29 September 2022

2022-09-29T18:13:33Z

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Scipediacontent at 04:59, 3 May 2022

2022-05-03T04:59:12Z

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Scipediacontent: Scipediacontent moved page Draft Content 411464895 to Townsend et al 2018a

2022-03-31T13:10:32Z

Scipediacontent moved page Draft Content 411464895 to Townsend et al 2018a

Scipediacontent: Created page with "== Abstract == High speed crafts made of glass fibre reinforced polymers (GFRP) suffer in-service structural damage due to the slamming impacts, when the bottom surface impac..."

2022-03-31T13:10:29Z

Created page with "== Abstract == High speed crafts made of glass fibre reinforced polymers (GFRP) suffer in-service structural damage due to the slamming impacts, when the bottom surface impac..."

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== Abstract ==

High speed crafts made of glass fibre reinforced polymers (GFRP) suffer in-service structural damage due to the slamming impacts, when the bottom surface impacts against the water. It is important to quantify the extend of the damage and progression during the service life of the ship. In this work, it is presented a methodology using non-destructive evaluation for the assessment of the level of damage in the laminated panels. It is also investigated the effect of the introduction of a viscoelastic layer, composed of two polymeric material with different stiffnesses, designed specifically to dissipate the impact energy. The combination of these polymers with different deformation response under compression, and due to the confinement of the elastomer in small cell surrounded by the rigid polymer, constitutes an effective mechanism of energy dissipation due to impacts, protecting the plies beneath the viscoelastic layer and minimizing the damaged generated in the laminates due to slamming. Test specimens have been prepared using GFRP prepregs cured Out-of-Autoclave (OoA) and impacted using a specifically designed device that apply pressure peaks in the laminates that resemble very closely those that appears in the hull due to slamming loads, and compared with and without viscoelastic layer in the laminate. Changes in panel compliance are used for monitoring the evolution of damage in the material, as a function of the number of repeated impacts imposed on the panel for every load condition. Drop weight tests have been also used to understand the percentage of the income energy that is generating damage in the material, and to establish threshold levels for damage initiation both for unprotected panels and those with viscoelastic shielding layer.

== Full document ==
<pdf>Media:Draft_Content_411464895native-articles-86.pdf</pdf>

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   [[Image:Townsend_et_al_2018a-image19.png|510px]] </div>
-'''Figura 15.''' Ensayos de impacto por caída de peso por gravedad de 30 a 60 J de energía a paneles modificados con capa viscoelástica.
+<div id="_Ref480808853" class="center" style="width: auto; margin-left: auto; margin-right: auto;">[[File:Townsend_et_al_2018a-image17.png|centre|600x600px]]<span style="text-align: center; font-size: 75%;">'''Figura 15.''' Ensayos de impacto por caída de peso por gravedad de 30 a 60 J de energía a paneles modificados con capa viscoelástica.</span></div>
 De los resultados del tratamiento de paneles ensayados con tintas penetrantes fluorescentes, se presenta en la <span id='cite-_Ref480809166'></span>[[#_Ref480809166|Figura 16]] la caracterización para el panel impactado a 40 y 80 J se observa que las capas del laminado sobre el viscoelásticos se encuentran rotas por el golpe con el impactador deformando incluso a la capa viscoelástica.  En las capas inferiores del material compuesto impactado a 40 Joules, hay una disminución brusca del daño produciendo pocas delaminaciones.

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