PSI - Issue 37

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 37 (2022) 841–846

© 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 © 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 Due to their excell nt performances in terms of high specific strength and stiffness, good static and dynam c prop rti s, goo corrosion resistance, adjustab e proper ie , competitiv ost, and quick manufacture, fibre-reinforced composites have been used in a va iety of engineering fields, and this trend is ex e ted to continue. In this context, he e materials are subjected to vari ty of environmental conditions, which have a major impact on their echanical characteristics. Altho gh seve al studies have been publish d on the influence of hostile solutions on l w velocity impact re ponse, he flexural atigue p rformance of composit aminates exposure to corrosive solutions still has s me lack of studies. As a result, the goal of this resear h is to investigate the low v loci y impac and flexural fatigue evaluat on of Kevlar/epoxy laminates after immersion in Sulphuric acid (H2SO4), diesel and seawater. For his purpose, static three- oint bending tests wer performed at a displacemen rate of 2 mm/min. The low v locity impact tests were made using a drop weig t t sting m chine IMATEK-IM10. Flexu al fatigue tests were carried out in flexu al mode us ng an Instron servohydraulic machine Constant amplitude loading t sts were performed at room temperature, under a stress ratio of R = 0.05 and frequ ncy of 2 Hz. It was concluded that the different solutions aff ct flexural and impact behaviour of the studied materials, but the exposure time was determinant on the mechanical properties’ degradation. © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira ICSI 2021 The 4th International Conference on Structural Integrity Effect of different hostile solutions on mechanical properties of composite materials M.P. Silva a *, P. Santos a , J.M. Parente a , S. Valvez a , P.N.B. Reis b a C-Mast, Dep. of Electromechanical Engineering, University of Beira Interior, Calçada Fonte do Lameiro, 6201-100, Portugal b University of Coimbra, CEMMPRE, Department of Mechanical Engineering, Coimbra, 3030-788, Portugal Abstract Due to their excellent performances in terms of high specific strength and stiffness, good static and dynamic properties, good corrosion resistance, adjustable properties, competitive cost, and quick manufacture, fibre-reinforced composites have been used in a variety of engineering fields, and this trend is expected to continue. In this context, these materials are subjected to a variety of environmental conditions, which have a major impact on their mechanical characteristics. Although several studies have been published on the influence of hostile solutions on low velocity impact response, the flexural fatigue performance of composite laminates exposure to corrosive solutions still has some lack of studies. As a result, the goal of this research is to investigate the low velocity impact and flexural fatigue evaluation of Kevlar/epoxy laminates after immersion in Sulphuric acid (H2SO4), diesel and seawater. For this purpose, static three-point bending tests were performed at a displacement rate of 2 mm/min. The low velocity impact tests were made using a drop weight testing machine IMATEK-IM10. Flexural fatigue tests were carried out in flexural mode using an Instron servohydraulic machine. Constant amplitude loading tests were performed at room temperature, under a stress ratio of R = 0.05 and frequency of 2 Hz. It was concluded that the different solutions affect flexural and impact behaviour of the studied materials, but the exposure time was determinant on the mechanical properties’ degradation. ICSI 2021 The 4th International Conference on Structural Integrity Effect of different hostile solutions on mechanical properties of composite materials M.P. Silva a *, P. Santos a , J.M. Parente a , S. Valvez a , P.N.B. Reis b a C-Mast, Dep. of Electromechanical Engineering, University of Beira Interior, Calçada F nte do Lameiro, 6201-100, Portugal b University of Coimbra, CEMMPRE, Department of Mechanical Engineering, Coimbra, 3030-788, Portugal

Keywords: Composite laminates; hostile solutions; experimental tests; low velocity impact; fatigue Keywords: Composite laminates; hostile solutions; experimental tests; low velocity impact; fatigue

* Corresponding author. E-mail address: marco.silva@ubi.pt * Corresponding author. E-mail address: marco.silva@ubi.pt

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 ope access article under the CC BY-NC-ND lic nse (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 under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.017