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Powder binders used for the manufacturing of wind turbine rotor blades. Part 2. Investigation of binder effects on the mechanical performance of glass fiber reinforced polymers

Schmidt, Stefan and Mahrholz, Thorsten and Kühn, Alexandra and Wierach, Peter (2019) Powder binders used for the manufacturing of wind turbine rotor blades. Part 2. Investigation of binder effects on the mechanical performance of glass fiber reinforced polymers. Journal of Composite Materials, 53 (16), pp. 2261-2270. Sage Publications. doi: 10.1177/0021998318824784. ISSN 0021-9983.

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Abstract

The automated manufacturing of wind turbine rotor blades needs binder systems which meet the requirements for online processing, show good preforming properties and do not affect the mechanical performance of the glass fiber reinforced polymer (GFRP) composites. In this study, especially the binder effect on the mechanical performance of corresponding glass fiber reinforced polymer is focused on. Three commercially available thermoplastic binders of different chemical composition and solubility in a rotor blade proven epoxy resin are used: Grilon MS (strongly soluble), D 2433E (partially soluble) and K140 (non-soluble). After manufacturing the binder-modified glass fiber reinforced polymer plates by the vacuum-assisted resin infusion technique, their mechanical performance is investigated with respect to binder solubility and concentration (1–3 wt.%). The mechanical characterization is based on tensile and compression tests – both longitudinal (0°) and transversal (90°) – as well as shearing tests (±45°). It is found that the glass fiber reinforced polymer strength and stiffness is strongly controlled by binder solubility and content. In the case of limited binder solubility and insolubility (D 2433E and K140), the performance of the composites reduces significantly as binder content increases. In contrast, stiffness and strength are not affected by the soluble binder Grilon MS, regardless of its content. These glass fiber reinforced polymer results strongly correspond with the results obtained for binder modified resin plates in a previous study. This correlation highlights the fact that binder ability for the preforming process might be classified by a simple pre-test for solubility and mechanical properties using the modified resin instead of applying the costly and time-intensive manufacturing steps of glass fiber reinforced polymer plates.

Item URL in elib:https://elib.dlr.de/127831/
Document Type:Article
Title:Powder binders used for the manufacturing of wind turbine rotor blades. Part 2. Investigation of binder effects on the mechanical performance of glass fiber reinforced polymers
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schmidt, Stefanstefan.schmidt (at) dlr.deUNSPECIFIED
Mahrholz, ThorstenThorsten.Mahrholz (at) dlr.dehttps://orcid.org/0000-0003-1488-0910
Kühn, Alexandraalexandra.kuehn (at) dlr.deUNSPECIFIED
Wierach, Peterpeter.wierach (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Journal of Composite Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:53
DOI :10.1177/0021998318824784
Page Range:pp. 2261-2270
Editors:
EditorsEmailEditor's ORCID iD
Hahn, H. ThomasUniversity of California, Los Angeles, USAUNSPECIFIED
Publisher:Sage Publications
ISSN:0021-9983
Status:Published
Keywords:glass fiber reinforced polymer (GFRP), preforming, binder, solubility, mechanical testing, wind turbine rotor blade
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy (old)
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 2019 10:54
Last Modified:06 Sep 2019 15:19

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