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About the Spring-In Phenomenon: Quantifying the Effects of Thermal Expansion and Chemical Shrinkage

Kappel, Erik and Stefaniak, Daniel and Hühne, Christian (2012) About the Spring-In Phenomenon: Quantifying the Effects of Thermal Expansion and Chemical Shrinkage. In: Adaptive, Tolerant and Efficient Composite Structures Research Topics in Aerospace. Springer Berlin Heidelberg. pp. 275-283. ISBN 978-3642291890 .

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Abstract

A straightforward approach to predict spring-in deformations of angled composite parts is presented. Therefore, a proposal by Radford is extended in order to calculate the spring-in contribution due to chemical shrinkage. For this, the volumetric shrinkage of neat thermoset resin, which is in the range of 2–7%, is transferred to equivalent strains on ply level assuming no shrinkage in fiber direction. As the fiber volume fraction (FVF) affects mechanical and chemical properties significantly, the spring-in angle is affected as well. Therefore, the numerical investigation accounts for the spring in angle and its thermal and chemical contributions depending on the FVF. Classical laminate theory (CLT) is utilized to homogenize layup expansion and shrinkage properties. For validation purposes, model predictions are compared with measurement results gained from one manufactured test specimen. Good agreement between analytical and experimental results is found. Furthermore, the chemical contribution of the total springin angle Du turned out to be significantly larger than the thermal contribution.

Document Type:Book Section
Title:About the Spring-In Phenomenon: Quantifying the Effects of Thermal Expansion and Chemical Shrinkage
Authors:
AuthorsInstitution or Email of Authors
Kappel, Erikerik.kappel@dlr.de
Stefaniak, Danieldaniel.stefaniak@dlr.de
Hühne, Christianchristian.huehne@dlr.de
Date:30 June 2012
Journal or Publication Title:Adaptive, Tolerant and Efficient Composite Structures
Page Range:pp. 275-283
Editors:
EditorsEmail
Wiedemann, Martinmartin.wiedemann@dlr.de
Sinapius, Michaelmichael.sinapius@dlr.de
Publisher:Springer Berlin Heidelberg
Series Name:Research Topics in Aerospace
ISBN:978-3642291890
Status:Published
Keywords:Spring-In, Deformations, CFRP
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Daniel Stefaniak
Deposited On:20 Jun 2012 09:48
Last Modified:20 Jun 2012 09:48

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