PSI - Issue 37

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 37 (2022) 217–224

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract Recent technological advancements led to active research in the field of additive manufacturing (AM) thanks to its ability to fabricate complex structures with reduced material waste. While many studies focused on quasi-static performance of AM materials and structures, investigations on the dynamic performance of these materials are still limited, especially for polymers and composites. The aim of this research is to investigate the dynamic fracture behaviour of AM polymer composites under ballistic impact. Nylon reinforced with short carbon fibres was selected, and fused deposition modelling was used to fabricate solid quasi-isotropic structures. Quasi-static tensile and compression tests were carried out based on ASTM standards to characterise the elastic-plastic properties of the manufactured material. Based on these tests, the material ’s deformation and fracture behaviour can be considered elastic-brittle. Further, dynamic mechanical analysis was conducted under a frequency sweep at room temperature to examine the viscoelastic properties; the material exhibited high elastic behaviour. Then, ballistic impact tests were performed on solid plates using a gas gun with 9 mm spherical steel projectiles at velocities ranging from 95 m s -1 to 120 m s -1 . Post-experimental observation revealed the complete target perforation, with a circular hole at the front of the plates and delamination at the back. The dynamic experimental conditions were reproduced within the finite-element simulations, employing Hashin damage criteria via a user subroutine. A similar perforation was achieved at the front of the plate. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Additive Manufacturing; Ballisitic Impact; Dynamic Fracture; Numerical Modelling; Polymer Composite. ICSI 2021 The 4th International Conference on Structural Integrity Dynamic fracture behaviour of additively manufactured polymers and composites under ballistic impact Md Niamul Islam, Konstantinos P. Baxevanakis*, Vadim V. Silberschmidt Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK. Abstract Recent technological advancements led to active research in the field of additive manufacturing (AM) thanks to its ability to fabricate omplex structures with reduced mat rial waste. W ile many stu ies focused on quasi-static performance of AM materials and structu es, investigations on the dyn mic performance of the e materials are still lim ted, especially for polymers and composite . The aim of this research is to i vestigate the dynamic fracture behaviour of AM polym r comp sites under ballistic impact Nylon rein orced with s ort carbon fibres was selected, and fused deposition modelling was used to fabricate so id quasi-isotropic st uctures. Quasi- tatic tensile and compr ssion tests wer carried ut bas d on ASTM s and rds o characteri e the elastic-plastic propert e of th manufactured material. Ba ed on thes tests, the material ’s deformation and fractur behaviour can be consider d lastic-brittle. Furthe , dyn m c mechanical analysis was conducted un r a frequency sweep at room temperature t examine the viscoe astic properties; the ateri l exhibited high elastic behaviour. Then, ballistic impact tests wer perform d n solid pla es using a gas gun with 9 mm sph ical steel projectiles t velocities ranging from 95 m s -1 to 120 m s -1 . Post-exp rimenta observation reve led the complete targ t perforation, wi h a circu ar hole t the front of the pla es and delamination at the back. Th dynamic experimental condi ions were ep oduced within the finite-element simulations, employi g Hashi damage criteria via a user subroutine. A similar perf ration was achiev at t e front of th plate. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of Pedro Miguel Guimara s Pires Moreira K ywords: Additive Manufacturing; Ballisitic Impact; Dyna ic Fracture; Numerical Modelling; Polymer Composite. ICSI 2021 The 4th International Conference on Structural Integrity Dynamic fracture behaviour of additively manufactured polymers and composites under ballistic impact Md Niamul Islam, Konstantinos P. Baxevanakis*, Vadim V. Silberschmidt Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK.

* Corresponding author. Tel.: +44 (0) 1509 227030; fax: +44 (0) 1509 227648. E-mail address: K.Baxevanakis@lboro.ac.uk * Corresponding author. Tel.: +44 (0) 1509 227030; fax: +44 (0) 1509 227648. E-mail address: K.Baxevanakis@lboro.ac.uk

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of Pedro Miguel Guimara s Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.050