| Description |
1 online resource (12 pages) : illustrations (chiefly color). |
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text txt rdacontent |
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computer c rdamedia |
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online resource cr rdacarrier |
| Series |
Conference paper ; NREL/CP-5000-75249 |
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Conference paper (National Renewable Energy Laboratory (U.S.)) ; 5000-75249.
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| Note |
"February 2020." |
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"Presented at the AIAA SciTech Forum and Exposition, Orlando, Florida, 6-10 January 2020"--Page 1 of cover. |
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"Funding was provided by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Wind and Water Technologies Office"--Verso of title page. |
| Bibliography |
Includes bibliographical references (pages 11-12). |
| Funding |
DE-AC36-08GO28308 |
| Note |
Description based on online resource; title from PDF title page (NREL, viewed on August 5, 2020). |
| Contents |
I. Background -- II. Approach and methodologies. A. Specimen manufacturing -- B. Long beam flexure -- III. Results and discussion. A. Core gap inspection -- B. Mechanical characterization -- IV. Conclusions and continuous research. |
| Summary |
Core gaps are a common manufacturing defect observed in wind blade composite sandwich constructions, which occur when sheets of core material are not properly butted up against each other in the mold. The aim of this study was to characterize core gaps in composite sandwich constructions at the coupon scale. This was to gain an initial understanding of the defect before developing appropriate methodologies for more complex subcomponents as part of a much broader wind blade structural validation and damage tolerance program. Long beam flexure in 4-point-bending was chosen as the most appropriate loading scenario. Beam specimens were characterized with and without 10 mm core gaps in fiberglass/balsa sandwich beams. The core gaps were characterized with two separate resin systems; a Hexion epoxy and Arkema's Elium resins system (a novel, infusible thermoplastic). Results showed that the Elium beams without the core gaps were had a 15% lower static strength than their epoxy counterparts. The introduction of the core gap to the epoxy beams reduced their static strength by 35%. The Elium beams, however, exhibited negligible strength reductions with the inclusion of the core gap. Overall, this characterization study provided pertinent information with regards to core gaps as a manufacturing defect to allow for continued development of damage tolerance and subcomponent validation methodologies with the inclusion of manufacturing defects. |
| Subject |
Horizontal axis wind turbines -- Blades -- United States.
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Wind turbines -- United States.
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Strains and stresses.
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Epoxy compounds.
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Éoliennes -- États-Unis.
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Contraintes (Mécanique)
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Époxydes.
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stress.
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strain.
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Epoxy compounds
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Horizontal axis wind turbines -- Blades
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Strains and stresses
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Wind turbines
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United States https://id.oclc.org/worldcat/entity/E39PBJtxgQXMWqmjMjjwXRHgrq
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| Indexed Term |
core gaps |
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subcomponent validation methods |
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wind energy |
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wind turbine |
| Added Author |
Hughes, Scott, author.
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National Renewable Energy Laboratory (U.S.), issuing body.
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United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, sponsoring body.
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| Standard No. |
1599568 OSTI ID |
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0000-0003-0341-7488 |
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0000-0002-9482-0020 |
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP-5000-75249 |
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