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Spring-in of curved CFRP/ foam-core sandwich structures

Kappel, Erik (2015) Spring-in of curved CFRP/ foam-core sandwich structures. Composite Structures (128), pp. 155-164. Elsevier. ISSN 0263-8223.

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Official URL: http://www.sciencedirect.com/science/article/pii/S026382231500241X


This paper reports on a comprehensive study on process-induced distortions (PID) of curved CFRP/foam-core sandwich panels. The study’s aim is to validate the prediction quality of two existing analytical models and a novel straightforward simulation technique, which utilizes measured spring-in distortions of representative monolithic samples as input. Sandwich specimens with a radius of approximately 350 mm are manufactured with three different core thicknesses and two different core run-out geometries. The manufactured parts show a significant radius reduction which declines for increasing core thickness which is satisfactorily predicted by both, the analytical models and the simulation. The effect of the run-out shape turned out to be of inferior relevance for the investigated specimen configurations. However, it is found to be essential to use plane-stress assumptions and to capture the stiffness ratio between the skins and the core. Therefore, an extension of the Fernlund model is proposed whose predictions match excellently with the measured distortion of the specimens. Given the simplicity of the simulation approach in combination with the limited number of inputs makes it a tool of great value, particularly early on in the design cycle.

Item URL in elib:https://elib.dlr.de/98992/
Document Type:Article
Title:Spring-in of curved CFRP/ foam-core sandwich structures
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kappel, Erikerik.kappel (at) dlr.deUNSPECIFIED
Date:15 September 2015
Journal or Publication Title:Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 155-164
Series Name:Elsevier
Keywords:Layered structures;Sandwich structures; Process-induced distortions; Spring-in prediction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old), L - Simulation and Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Kappel, Dr.-Ing. Erik
Deposited On:30 Nov 2015 06:25
Last Modified:10 Jan 2019 15:46

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