PSI - Issue 28

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

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Procedia Structural Integrity 28 (2020) 1664–1672

© 2020 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 the European Structural Integrity Society (ESIS) ExCo Abstract This experimental work focuses on the strain-rate effect of unidirectional carbon/epoxy composite with enhanced electrical conductivity. With respect to the reference composite material, the modification on the electrical properties was realized through interleaving a sliver-loaded conductive veil into the composite laminate, which was developed and supplied by AVIC Composite Center (ACC). Benchmarking was also carried out against the non-modified unidirectional (UD) carbon/epoxy composite, labelled as “reference material”, to study the influence of this modification on the compressive stress-strain behavior of the material. Dynamic compression tests were carried out using a split Hopkinson pressure bar (SHPB) system along with a high-speed camera to monitor the progressive failure of the test samples under impact loading. Quasi-static experiments were also performed using a servo-hydraulic loading frame in accordance with ISO 14126. The findings show a decline on the elastic modulus of the electrically modified composite material when compared with that of reference material, regardless of the exposed loading rates. As for the strain-rate effect, both material configurations were found to be rate dependent. At high loading rates, the longitudinal compressive strength increased by around 60% and 91% for modified and reference UD carbon/epoxy composites, respectively. Despite that, the loading rate appears to have an insignificant effect on the elastic modulus of both material configurations. Abstract This experimental work focuses on the strain-rate effect of unidirectional carbon/epoxy composite with enhanced electrical conductivity. With respect to the reference composite material, the modification on the electrical properties was realized through interleaving a sliver-loaded conductive veil into the composite laminate, which was developed and supplied by AVIC Composite Center (ACC). Benchmarking was also carried out against the non-modified unidirectional (UD) carbon/epoxy composite, labelled as “reference material”, to study the influence of this modification on the compressive stress-strain behavior of the material. Dynamic compression tests were carried out using a split Hopkinson pressure bar (SHPB) system along with a high-speed camera to monitor the progressive failure of the test samples under impact loading. Quasi-static experiments were also performed using a servo-hydraulic loading frame in accordance with ISO 14126. The findings show a decline on the elastic modulus of the electrically modified composite material when compared with that of reference material, regardless of the exposed loading rates. As for the strain-rate effect, both material configurations were found to be rate dependent. At high loading rates, the longitudinal compressive strength increased by around 60% and 91% for modified and reference UD carbon/epoxy composites, respectively. Despite that, the loading rate appears to have an insignificant effect on the elastic modulus of both material configurations. Keywords: Strain-rate effe t; Split Hopkinson pressure bar; Conductive polymer composites . 1st Virtual European Conference on Fracture Strain-rate sensitivity of electrically modified carbon/epoxy composites under dynamic compressive loading Sahand P. Shamchi a,b,* ,Anurag Singh a , Carmen Sguazzo a , Zhongjie Zhao c,d , Xiaosu Yi c,d,e , Paulo J. Tavares a , Pedro M.G.P. Moreira a a INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal b FEUP, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal c School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China d AVIC Composites Co., Ltd, 66 Shuanghe Road, Shunyi District, Beijing 101300, PR China e Faculty of Science and Engineering, University of Nottingham Ningbo China (UNNC), 199 Taikang East Road, Ningbo 315100, PR China 1st Virtual European Conference on Fracture Strain-rate sensitivity of electrically modified carbon/epoxy composites under dynamic compressive loading Sahand P. Shamchi a,b,* ,Anu ag Si gh a , Carmen Sguazzo a , Zhongjie Zhao c,d , Xiaosu Yi c,d,e , Paulo J. Tavares a , Pedro M.G.P. Moreira a a INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal b FEUP, F culty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal c School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China d AVIC Composites Co., Ltd, 66 Shuanghe Road, Shunyi District, Beijing 101300, PR China e Faculty of Science and Engineering, University of Nottingham Ningbo China (UNNC), 199 Taikang East Road, Ningbo 315100, PR China

Keywords: Strain-rate effect; Split Hopkinson pressure bar; Conductive polymer composites .

* Corresponding author E-mail address: spourhassan@inegi.up.pt * Corresponding author E-mail address: spourhassan@inegi.up.pt

2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.140 2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo