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Surface Quality of Carbon Fibre Reinforced Nanocomposites: Investigation and Evaluation of Processing Parameters Controlling the Fibre Print-Through Effect

Mahrholz, Thorsten and Sinapius, Michael (2021) Surface Quality of Carbon Fibre Reinforced Nanocomposites: Investigation and Evaluation of Processing Parameters Controlling the Fibre Print-Through Effect. In: Acting Principles of Nano-Scaled Matrix Additives for Composite Structures Springer Research Topics in Aerospace, 6. Springer, Cham. pp. 433-456. doi: 10.1007/978-3-030-68523-2_19. ISBN 978-3-030-68522-5.

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Abstract

The chapter investigates the effect of the essential manufacturing parameters on the surface quality of uncoated carbon fibre reinforced composites (CFRP) used as car body panels with visible surfaces (Class A properties). A series of CFRP laminates maunfactured by the RTM technique are investigated varying in the fibre volume content (30–60%), reinforcement material (woven fabrics vs. unidirectional fibre reinforcements), curing temperatures (40–120 °C), additives (SiO2-nanoparticles as matrix fillers) and using a surface finish applied as an in-mould coating. The laminate surfaces are characterized by roughness analysis (white-light interferometry) and wave-scan measurement to quantify the influence of the different manufacturing parameters on the surface quality. Especially the used resins are intensively characterized concerning thermal properties (CTE) and total resin shrinkage. These results correlate very well with the performed analysis of surface roughness. It is found that the fibre print through effect is significantly reduced by realising low total resin shrinkage and an even distribution of resin and fibres at the surface. Thus, using of unidirectional fibre reinforcement (no weft or sewing threads; very fine filaments), low curing temperatures (slow curing processes) and an in-mould coating are most successful for reduction of fibre print through effect and getting surface similar to Class A properties. In addition, the surface quality is quite positively affected by the application of nanoparticles and also strongly controlled by roughness of tooling.

Item URL in elib:https://elib.dlr.de/142620/
Document Type:Book Section
Title:Surface Quality of Carbon Fibre Reinforced Nanocomposites: Investigation and Evaluation of Processing Parameters Controlling the Fibre Print-Through Effect
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mahrholz, Thorstenthorsten.mahrholz (at) dlr.dehttps://orcid.org/0000-0003-1488-0910
Sinapius, Michaelm.sinapius (at) tu-braunschweig.dehttps://orcid.org/0000-0002-1873-9140
Date:May 2021
Journal or Publication Title:Acting Principles of Nano-Scaled Matrix Additives for Composite Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:6
DOI :10.1007/978-3-030-68523-2_19
Page Range:pp. 433-456
Editors:
EditorsEmailEditor's ORCID iD
Sinapius, Michaelm.sinapius@tu-braunschweig.dehttps://orcid.org/0000-0002-1873-9140
Ziegmann, Gerhardziegmann@puk.tu-clausthal.dehttps://orcid.org/0000-0001-7914-8574
Publisher:Springer, Cham
Series Name:Springer Research Topics in Aerospace
ISBN:978-3-030-68522-5
Status:Published
Keywords:CFRP, laminate, cure behaviour, surface analysis, resin transfer moulding, class A, fibre print through, resin shrinkage, nanoparticles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Mahrholz, Dr.rer.nat. Thorsten
Deposited On:21 Jun 2021 08:37
Last Modified:21 Jun 2021 08:37

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