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The effect of nonlinear elastic materials on swept aeroelastic wings

Bramsiepe, Kjell and Klimmek, Thomas and Krüger, Wolf R. and Tichy, Lorenz (2019) The effect of nonlinear elastic materials on swept aeroelastic wings. DLRK 2019 - Deutscher Luft- und Raumfahrtkongress 2, 30. Sep. - 02. Okt. 2019, Darmstadt, Germany.

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Aircraft design under the terms of regulations postulates load cases between 2.5g and ‑1.0g. According to statistical load data, high manoeuvre and gust loads (-1.0g and 2.5g) occur seldom, but they determine aircraft structures. In contrast to linear aircraft materials (e.g. aluminium, carbon), rubber like materials show nonlinear elastic behaviour. Hence, the aim is to create passive load alleviation with nonlinear elastic materials. The idea is to increase the performance during low load cases around cruise and to decrease the loading for high load cases. In other words, we want to create a wing which is stiff during cruise and which gets more flexible at high loading cases. To examine this, an iterative process computes three trimmed quasi steady manoeuvres (1.0g, 2.5g, -1.0g). In doing so, the process considers the aeroelastic coupling. It iteratively calculates loads and deformations, using the Vortex Lattice Method (VLM) for the aerodynamic analysis and the Nonlinear Solution of MSC Nastran (SOL400) for the structural analysis. Also, Solution 400 computes the deformation due to the loads iteratively. The process utilises a rectangular 30° aft swept wing with a wingspan of 60 m which is close to common long range aircraft. A finite element model with beam elements represents the load carrying structure. A vortex lattice simulates the aerodynamics. The reference wing structure with the linear material is untwisted. To compare two different approaches of nonlinear elastic materials, the corresponding wing structures are pretwisted. This ensures an equal lift distribution of the 1g load cases. The root bending moment decreases of about 3.98% for the material with the stiffer area at cruise conditions.

Item URL in elib:https://elib.dlr.de/130151/
Document Type:Conference or Workshop Item (Speech)
Title:The effect of nonlinear elastic materials on swept aeroelastic wings
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Klimmek, ThomasUNSPECIFIEDhttps://orcid.org/0000-0002-5573-7355UNSPECIFIED
Krüger, Wolf R.UNSPECIFIEDhttps://orcid.org/0000-0002-7949-1169UNSPECIFIED
Tichy, LorenzUNSPECIFIEDhttps://orcid.org/0000-0001-9092-5864UNSPECIFIED
Date:30 September 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:nonlinear elastic material, passive load alleviation, aeroelastic tailoring, material tailoring
Event Title:DLRK 2019 - Deutscher Luft- und Raumfahrtkongress 2
Event Location:Darmstadt, Germany
Event Type:national Conference
Event Dates:30. Sep. - 02. Okt. 2019
Organizer:DGLR - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberath e.V.
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Bramsiepe, Kjell
Deposited On:23 Dec 2019 15:50
Last Modified:23 Dec 2019 15:53

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