PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 18 (2019) 577–585

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Abstract This study presents the impact behaviour of marine sandwich composite beam structures that manufactured by vacuum-assisted resin infusion process (VARIM). The sandwich composite consists of different thicknesses of upper and lower E-glass fibre reinforced polymer as facesheets and PVC foam as core material. Low velocity impact tests have been conducted to understand the impact response of the sandwich composite by using a drop-weight impact machine with a hemispherical impactor. Square samples with 100 mm X 100 mm side dimensions were subjected to impact machine at five energy levels of 20J, 40J, 60J, 80J and 100J. The impact loadings have been applied to thicker facesheet of the sandwich composite to obtain impact parameters experimentally. Damage type on thicker facesheets and internal parts of PVC foam have been characterized through the contact force - time, contact force - displacement and contact force - energy curves after the tests. Impact failures that occurred on the upper facesheets, core and lower facesheets of the specimens were observed. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 1. Introduction Low velocity impact tests were widely used in order to understand the dynamic deformation of composites by many researchers (Abramovich et al, 2010; Klepka et al, 2012). Low velocity impact tests are preferred to observe dynamic deformation and failure modes of materials (Espinosa, 2000). Atas and Sevim (2010) examined the impact behaviour of sandwich composite panels with PVC and Balsa cores under different impact energies. The load-deflection curves and energy profile diagrams were obtained to understand impact response and fracture modes. Delaminations between glass-epoxy layers and face/core debonding were examined. Abstract This study presents the impact behaviour of marine sandwich composite beam structures that manufactured by vacuum-ass st d sin infusion proces (VARIM). The sandwich composite consists of different thicknes es of upp r and low r E-glass fibre reinforced polymer as fac sheets and PVC foam as core material. Low velocity impact tests ve been conducted to understand the impact response of the sandwich co po ite by using a drop-weight imp t machine with a hemispherical impactor. Square samples with 100 mm X 100 mm sid dimensions were subjected to impact machine at five energy levels of 20J, 40J, 60J, 80J and 100J. The impact lo dings have been applied to thicker facesheet the sandwich composite to obtain impact parame ers exp rimentally. D mage type on thicker facesheets and int rnal parts of PVC oam have been characterized through th c tact forc - time, contact force - displ m nt and contact force - n rgy curves after the tests. Impact failures that occurred on the upper facesheets, core and lower facesheets of the specimens were observed. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Sandwich Composite Material, Low Velocity Impact Testing, Impact Energy 1. Introduction Low velocity impact tests were widely used in order to understand the dynamic deformation of composites b many researchers (Abramovich et al, 2010; Klepka et al, 2012). Low velocity impact tests are preferred to observe dynamic deformation and failure modes of materials (Espinosa, 2000). Atas and Sevim (2010) examined the impact behaviour of sandwich composite panels with PVC and Balsa cores under different impact energies. The load-deflection curves and energy profile diagrams were obtained to understand impact response and fracture modes. Delaminations between glass-epoxy layers and face/core debonding were examined. Keywords: Sandwich Composite Material, Low Velocity Impact Testing, Impact Energy * Corresponding author: Kong Fah Tee, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK. E-mail address: K.F.Tee@gre.ac.uk * Correspon ing author: Kon F h Tee, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK. E-mail address: K.F.Tee@gre.ac.uk 25th International Conference on Fracture and Structural Integrity Low Velocity Impact Behaviour of Sandwich Composite Structures 25th International Conference on Fracture and Structural Integrity Low Velocity Impact Behaviour of Sandwich Composite Structures with E-Glass/Epoxy Facesheets and PVC Foam Ayse Cagla Balaban a , Kong Fah Tee a* , Meltem Evren Toygar b a University of Greenwich, School of Engineering, Kent, ME4 4TB, UK b Dokuz Eylul University, Department of Mechanical Engineering, Izmir, 35390, Turkey with E-Glass/Epoxy Facesheets and PVC Foam Ayse Cagla Balaban a , Kong Fah Tee a* , Meltem Evren Toygar b a University of Gre nwich, School of Engineering, K nt, ME4 4TB, UK b Dokuz Eylul University, Department of Mechanical Engineering, Izmir, 35390, Turkey

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.202