PSI - Issue 17

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

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Procedia Structural Integrity 17 (2019) 190–197

ICSI 2019 The 3rd International Conference on Structural Integrity An improved technique for verification of high-speed impact simulation Radek Doubrava a *, Martin Oberthor a , Ondřej Vích a a VZLÚ (Czech Aerospace Research Centre), Beranových 130, Prague – Letňany , 199 05, Czech Republic ICSI 2019 The 3rd International Conference on Structural Integrity An improved technique for verification of high-speed impact simulation Radek Doubrava a *, Martin Oberthor a , Ondřej Vích a a VZLÚ (Czech Aerospace Research Centre), Beranových 130, Prague – Letňany , 199 05, Czech Republic

Abstract Abstract

The risk of strange objects impacts that can decrease local strength properties must be taken into account in the design of primary airframe structures in the aeronautics, energy and space industries. Damage that may occur as a result of high-speed impacts can affect the structure load carrying capacity of the structure. Testing all impact scenarios on real structures is expensive and impractical. This paper integrates numerical analyses with high-speed impact tests of hail stones on flat metallic and composite panels. A new technique for displacement measurements using a laser triangulation sensor during impacts were proposed and used for a quantitative analysis and for precision verification of a numerical model results. A comparison between the testing and simulation results reveals consistent predictions of damage initialization on the composite material and plastic deformation on the metallic material. The application of flat test panels for verification and tuning of the numerical models allows an optimized final design of a real structure and decreases the risk of non-compliance of the structure during verification tests. The risk of strange objects impacts that can decrease local strength properties must be taken into account in the design of primary airframe structures in the aeronautics, energy and space industries. Damage that may occur as a result of high-speed impacts can affect the structure load carrying capacity of the structure. Testing all impact scenarios on real structures is expensive and impractical. This paper integrates numerical analyses with high-speed impact tests of hail stones on flat metallic and composite panels. A new technique for displacement measurements using a laser triangulation sensor during impacts were proposed and used for a quantitative analysis and for precision verification of a numerical model results. A comparison between the testing and simulation results reveals consistent predictions of damage initialization on the composite material and plastic deformation on the metallic material. The application of flat test panels for verification and tuning of the numerical models allows an optimized final design of a real structure and decreases the risk of non-compliance of the structure during verification tests.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: FEM; high-speed impact; test Keywords: FEM; high-speed impact; test

1. Introduction 1. Introduction

Safety is the ultimate aim in aeronautical transport. Therefore, the international civil aviation evaluates the operation of aircrafts based on acquired experience, but of particular importance in terms of experience are air accidents. Air accidents are events that lead to new approaches to the operation of aircrafts and build knowledge about aircraft Safety is the ultimate aim in aeronautical transport. Therefore, the international civil aviation evaluates the operation of aircrafts based on acquired experience, but of particular importance in terms of experience are air accidents. Air accidents are events that lead to new approaches to the operation of aircrafts and build knowledge about aircraft

* Corresponding author. Tel.: +420-225115134. E-mail address: doubrava@vzlu.cz * Corresponding author. Tel.: +420-225115134. E-mail address: doubrava@vzlu.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.026