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Wind tunnel experiment with an EPP-wing to investigate aeroelastic effects of nonlinear elastic stiffnesses

Bramsiepe, Kjell and Braune, Marc and Krüger, Wolf R. and Tichy, Lorenz (2022) Wind tunnel experiment with an EPP-wing to investigate aeroelastic effects of nonlinear elastic stiffnesses. ICAS 2022, 4.-9. Sep. 2022, Stockholm, Schweden.

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Official URL: https://www.icas.org/ICAS_ARCHIVE/ICAS2022_preliminary/data/papers/ICAS2022_0663_paper.pdf


Background: Nonlinear elastic, especially degressive, stiffnesses can reduce the wing root bending moment for design loadcases, while the cruise flight shape remains unchanged. Objective: The aim of the wind tunnel experiment is to show up the behaviour of a wing with a degressive stiffness. The tested wing is made of expanded polypropylene foam (EPP). Method: A flexural bending test is conducted to gain the bending stiffness of EPP for different densities and a wind tunnel test is performed to obtain the dependency between bending moment and deflection. The findings are compared to the results of an aeroelastic method based on a nonlinear elastic beam. Results: The bending stiffness of EPP material exhibit a nonlinear degressive stiffness. The foam wing has a softening characteristic for ascending loads. The numerical beam method for nonlinear elastic wings shows up a good agreement with the experiment and points out the load reducing effect of nonlinear structures.

Item URL in elib:https://elib.dlr.de/189396/
Document Type:Conference or Workshop Item (Speech)
Title:Wind tunnel experiment with an EPP-wing to investigate aeroelastic effects of nonlinear elastic stiffnesses
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bramsiepe, KjellKjell.Bramsiepe (at) dlr.dehttps://orcid.org/0000-0003-3351-8036
Braune, MarcMarc.Braune (at) dlr.deUNSPECIFIED
Krüger, Wolf R.Wolf.Krueger (at) dlr.dehttps://orcid.org/0000-0002-7949-1169
Tichy, LorenzLorenz.Tichy (at) dlr.dehttps://orcid.org/0000-0001-9092-5864
Date:September 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:hyperelastic stiffness, aeroelasticity, validation experiment, foam wing, load alleviation
Event Title:ICAS 2022
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:4.-9. Sep. 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Aircraft Technologies and Integration
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Institute of Aeroelasticity > Aeroelastic Experiments
Institute of Aeroelasticity > Administration AE
Deposited By: Bramsiepe, Kjell
Deposited On:26 Oct 2022 11:01
Last Modified:26 Oct 2022 11:01

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