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Thermal Aspects for Composite Structures - From Manufacturing to In-Service PredictionsI

Spröwitz, T. and Huehne, Chr. and Kappel, E. (2009) Thermal Aspects for Composite Structures - From Manufacturing to In-Service PredictionsI. CEAS 2009, 26. - 29. Okt. 2009, Manchester, UK.

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Abstract

Manufacturing of composite structures with a high degree of dimensional accuracy remains a challenge in modern fabrication. Residual stresses in fibre reinforced laminates which develop during the autoclav processing lead to a variety of process induced deformations. Dimensional changes such as spring-in of angled structures and warpage of flat sections are characteristic for composite manufacturing. This paper presents an engineering approch for a thermo-elastic simulation of the spring-in effect on large airframe structures based on the FE method performed at the DLR Institute of Composite Structures and Adaptive Systems. Due to the use of Ni36 as tooling material it was possible to blank out the influence of varying CTE between tool and part which are responsible for warpage. Investigations on small manufactured L-profiles with a flangelength of 50mm deliver the necessary simulation parameters for the constitutive model of the relevant airframe structure. For estimating the influence of different autoclav processes on the amount of spring-in, investigations with different temperature profiles were conducted and will be presented.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Thermal Aspects for Composite Structures - From Manufacturing to In-Service PredictionsI
Authors:
AuthorsInstitution or Email of Authors
Spröwitz, T.DLR, Institute of Space Systems
Huehne, Chr.DLR, Institute of Composite Structures and Adaptive Systems
Kappel, E.DLR, Institute of Composite Structures and Adaptive Systems
Date:2009
Status:Published
Keywords:Composites, CTE, spring-in, thermo-elastic, aircraft structures
Event Title:CEAS 2009
Event Location:Manchester, UK
Event Type:international Conference
Event Dates:26. - 29. Okt. 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systemanalyse Raumsegmente
Deposited By: Nicola Behrens
Deposited On:04 Jan 2010 15:32
Last Modified:15 Jan 2010 02:19

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