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Mechanical Characterisation of Polycarbonate for Helicopter Windshields

Ritt, Stefan Andreas and Vinot, Mathieu (2018) Mechanical Characterisation of Polycarbonate for Helicopter Windshields. Sexto Simposio Nacional en Mecánica de Materiales y Estructuras Continuas – SMEC 2018, 30.-31. August 2018, Cartagena, Kolumbien. ISBN 978-958-8862-50-7.

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Transparent thermoplastics like polycarbonate are widely used as windshields for its optical properties and for their higher specific mechanical properties compared to glass. Under use in airframe front windshields, plastics transparencies can be exposed to impact scenarios such as bird-strikes. The resulting load can lead to a complex loading of the material dominated by tension and bending. In order to generate input for realistic simulation results, experiments have been performed to characterise the materials under these loading modes at coupon level in the elastic and plastic domain. On the simulation side, numerical models comprising a discretisation with elements applying Reissner’s plate bending theory have been used in the explicit finite-element method within the LS-DYNA framework with latest solver version R10.1. Experiments were performed at different strain-rates ranging from quasi-static to approx. 75 1/s. The numerical modelling has been done with thin and thick shell elements. The thin shell element approach used the Reissner-Mindlin kinematic assumption in fully-integrated shells. Additionally, some thick shell formulations with various approaches were applied. To cover the strain-rate sensitive behaviour, a material model based on the Johnson-Cook theory was applied. The influence of the modelling was investigated and compared to the experimental characterisation.

Item URL in elib:https://elib.dlr.de/121787/
Document Type:Conference or Workshop Item (Speech)
Title:Mechanical Characterisation of Polycarbonate for Helicopter Windshields
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ritt, Stefan AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-5330-509X
Date:31 August 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
Useche, Jairo F.Universidad Tecnológica de Bolívar / juseche@utb.edu.coUNSPECIFIED
Series Name:Simposio Nacional en Mecánica de Materiales y Estructuras Continuas
Keywords:Damage mechanics, impact, bird-strike, windshields, glazing, transparencies, material modelling, explicit Finite Element Method, Reissner plates
Event Title:Sexto Simposio Nacional en Mecánica de Materiales y Estructuras Continuas – SMEC 2018
Event Location:Cartagena, Kolumbien
Event Type:national Conference
Event Dates:30.-31. August 2018
Organizer:Universidad Tecnológica de Bolívar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Robust Rotorcraft (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Structural Integrity
Deposited By: Ritt, Stefan Andreas
Deposited On:05 Dec 2018 09:32
Last Modified:20 Jun 2021 15:51

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