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Prediction of process-induced distortions and residual stresses of a composite suspension blade

Hein, Robert and Wille, Tobias and Gabtni, Khalil and Dias, Jean-Paul (2015) Prediction of process-induced distortions and residual stresses of a composite suspension blade. In: Defect and Diffusion Forum Fluid Flow, Energy Transfer and Design II (362). Trans Tech Publications. pp. 224-243. doi: 10.4028/www.scientific.net/DDF.362.224. ISBN 978-3-03835-439-0.

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Official URL: http://www.ttp.net/978-3-03835-439-0/2.html


This paper deals with a universal simulation strategy for the calculation of process-induced distortions and residual stresses of a composite part. The mechanical material behavior is described by a viscoelastic material model depending on temperature and degree of cure . The required material parameters are derived by dynamic mechanical analyses. For the description of the reaction kinetic a phenomenological based model considering chemical and diffusion-controlled reactions is introduced. The reaction model parameters are fitted to isothermal and dynamic DSC measurements via global and local optimization. The thermal expansion and chemical shrinkage are characterized by thermal mechanical analysis and using the contact angle measurement method. The simulation strategy is demonstrated for a GFRP suspension blade for the automobile industry. Based on a sequential coupled temperature-displacement analysis thermal hot spots, temperature and degree of cure distributions as well as the final corresponding process-induced distortions and residual stresses are calculated and analyzed. The development of the stiffness and the correlated stress during the curing process are discussed in more detail. Furthermore, the effect of a degree of cure dependent stiffness on the stresses is investigated.

Item URL in elib:https://elib.dlr.de/102240/
Document Type:Contribution to a Collection
Title:Prediction of process-induced distortions and residual stresses of a composite suspension blade
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:Defect and Diffusion Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 224-243
Publisher:Trans Tech Publications
Series Name:Fluid Flow, Energy Transfer and Design II
Keywords:Process simulation, Process-induced distortions, Residual Stresses, Viscoelasticity, Cure kinetic, Exothermal reaction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC Fahrzeugstruktur (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Hein, Robert
Deposited On:15 Jan 2016 14:52
Last Modified:20 Jun 2021 15:47

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