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On abnormal thermal-expansion properties of more orthotropic M21E/IMA carbon-fiber-epoxy laminates

Kappel, Erik and Prussak, Robert (2019) On abnormal thermal-expansion properties of more orthotropic M21E/IMA carbon-fiber-epoxy laminates. Composites Communications, 17, pp. 129-133. Elsevier. doi: 10.1016/S2452213919301792. ISSN 2452-2139.

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Official URL: https://www.sciencedirect.com/science/article/pii/S2452213919301792


The present paper reports on an anomaly of laminates' coefficients of thermal expansion (CTE), which has been observed for more-orthotropic laminates of a series-quality M21E/IMA prepreg-made composite frame. It was found that measured CTEs increasingly deviate from theoretical CTE values, derived from unidirectional ply data, when the degree of laminate orthotropy increases. The paper comprises experimental CTE measurements for the unidirectional M21E/IMA ply and six specific laminates of a full-scale frame. Analyses suggest that the observed discrepancy correlates with the laminates' degree of orthotropy, which is quantified by the in-plane Young's modulus ratio in this paper. The observed effect is considered critical as inhomogeneous CTEs lead to process-induced distortions of curved composite structures. Thus, they play a key role when carbon-fiber-epoxy composite frames shall be made in tight dimensional tolerances. Wrong CTE calculation leads to erroneous shape predictions, inaccurate tool compensation and finally to assembly problems.

Item URL in elib:https://elib.dlr.de/132475/
Document Type:Article
Title:On abnormal thermal-expansion properties of more orthotropic M21E/IMA carbon-fiber-epoxy laminates
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kappel, ErikErik.Kappel (at) dlr.dehttps://orcid.org/0000-0002-8760-8451
Prussak, RobertRobert.Prussak (at) dlr.dehttps://orcid.org/0000-0002-9777-0495
Date:2 December 2019
Journal or Publication Title:Composites Communications
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/S2452213919301792
Page Range:pp. 129-133
Keywords:Wärmeausdehnungskoeffizienten, Laminatorthotropie, Faserverbundlaminate, CFK, M21E, CLT, CTE
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)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Kappel, Dr.-Ing. Erik
Deposited On:31 Dec 2019 10:36
Last Modified:31 Dec 2019 10:36

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