PSI - Issue 35

ScienceDirect Available online at www.sciencedirect.com S i Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 35 (2022) 132–140 Structural Integrity Procedia 00 (2019) 000 – 000

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© 2021 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 IWPDF 2021 Chair, Tuncay Yalçinkaya Abstract The paper analyses the influence of case idealization of the impacted area on the result of the laminate test specimen strength, which was acquired from calculation. Work is focused on simulation of composite specimen impact test conducted in accordance with ASTM D7136 standard. The initial stiffness and strength were compared with properties of damaged samples and influence of damaged area model description was studied. The calculations performed with ABAQUS software were part of a broader set of analyses, that preceded the demonstrated experiments. The numerical results show a high correlation with the experimental data mainly in terms of stiffness and strength. Keywords: laminate; composite; impact; simulation; Abaqus; damage; experiment; idealization 1. Introduction All structural parts go through several processes during their lifetime, which must be considered during design and certification of any structure. The service life factor is influenced by production technology, the method of assembly, surface treatment, operating conditions and the whole range of planned or less expected load cases, that discussed in Šedek (2017). Methodology of the certification process should be different considering various requirements. The certification procedure according airworthiness requirements are described and discussed in documents EASA (2010), FAA (2016) and by authors Růžek (2009), Kruse (2016) and Kruse (2017). During the period of use a large or small number of damages can occur and the influence must be considered in terms of the impact on the further safe use, Růžek (2015). The group of expected damage of a smaller extent with relationships to service life also includes poorly identifiable damage caused by a collision with fast moving objects, Cagáň (2019) Abstract The paper analyses the influence of case idealization of the impacted area on the result of the laminate test specimen strength, which was acquired from calculation. Work is focused on simulation of composite specimen impact test conducted in accordance with ASTM D7136 standard. The initial stiffness and strength were compared with properties of damaged samples and influence of damaged area model description was studied. The calculations performed with ABAQUS software were part of a broader set of nalyses, that pr ceded the demonstrated experiments. The numerical results show a high correlation with the experimental data mainly in te ms of stiffness and strength. Keywords: laminate; composite; impact; simulation; Abaqus; damage; experiment; idealization 1. Introduction All structural parts go through several processes during their lifetime, which must be considered during design and certification of any structure. The service life factor is influenced by production technology, the method of assembly, surface treatment, operating conditions and the whole range of planned or less expected load cases, that discussed in Šedek (2017). Methodology of the certification process should be different considering various requirements. The certification procedure according airworthiness requirements are described and discussed in documents EASA (2010), FAA (2016) and by authors Růžek (2009), Kruse (2016) and Kruse (2017). During the period of use a large or small number of damages can occur and the influence must be considered in terms of the impact on the further safe use, Růžek (2015). The group of expected damage of a smaller extent with relationships to service life also includes poorly identifiable damage caused by a collision with fast moving objects, Cagáň (2019) 2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials Impacted area description effect on strength of laminate determined by calculation 2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials Impacted area description effect on strength of laminate determined by calculation Jarmil Vl ch a, * , Jan Raška a , Jan Horňas a , Lucie Petrusová a a VZLU – Czech Aerospace Research C ntre, Beranovych 130, Prague 199 05, Czech Republic Jarmil Vlach a, * , Jan Raška a , Jan Horňas a , Lucie Petrusová a a VZLU – Czech Aerospace Research Centre, Beranovych 130, Prague 199 05, Czech Republic

* Corresponding author. Tel.: +420-225-115-172. E-mail address: vlach@vzlu.cz

2452-3216 © 2021 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 IWPDF 2021 Chair, Tuncay Yal ç inkaya 10.1016/j.prostr.2021.12.057 2452-3216 © 2021 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 IWPDF 2021 Chair, Tuncay Yalçinkaya 2452-3216 © 2021 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 IWPDF 2021 Chair, Tuncay Yalçinkaya * Corresponding author. Tel.: +420-225-115-172. E-mail address: vlach@vzlu.cz