Application and Analysis of Sandwich Elements in the Primary Structure of Large Wind Turbine Blades

Christian Berggreen, Kim Branner, Jacob Fisker Jensen, Jacob Pagh Schultz

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The present work studies the advantages of applying a sandwich construction as opposed to traditional single skin composites in the flanges of a load carrying spar in a future 180 m wind turbine rotor. A parametric finite element model is used to analyze two basic designs with single skin and sandwich flanges, respectively. Buckling is by far the governing criterion for the single skin design. Introducing a sandwich construction results in a globally more flexible structure making tower clearance the critical criterion. Significant weight reduction up to 22.3% and increased buckling capacity is obtained. Moreover, the study showed that proper choice of core material is important to prevent face wrinkling. Geometric nonlinear analysis showed sensitivity to imperfections. A consistent submodeling technique is presented for verifying the response from the global model in any section of interest.
Original languageEnglish
JournalJournal of Sandwich Structures and Materials
Volume9
Issue number6
Pages (from-to)525-552
ISSN1099-6362
DOIs
Publication statusPublished - 2007

Keywords

  • wind turbine blades
  • sandwich
  • sensitivity analysis
  • Buckling
  • FEA

Cite this

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title = "Application and Analysis of Sandwich Elements in the Primary Structure of Large Wind Turbine Blades",
abstract = "The present work studies the advantages of applying a sandwich construction as opposed to traditional single skin composites in the flanges of a load carrying spar in a future 180 m wind turbine rotor. A parametric finite element model is used to analyze two basic designs with single skin and sandwich flanges, respectively. Buckling is by far the governing criterion for the single skin design. Introducing a sandwich construction results in a globally more flexible structure making tower clearance the critical criterion. Significant weight reduction up to 22.3{\%} and increased buckling capacity is obtained. Moreover, the study showed that proper choice of core material is important to prevent face wrinkling. Geometric nonlinear analysis showed sensitivity to imperfections. A consistent submodeling technique is presented for verifying the response from the global model in any section of interest.",
keywords = "wind turbine blades, sandwich, sensitivity analysis, Buckling, FEA",
author = "Christian Berggreen and Kim Branner and Jensen, {Jacob Fisker} and Schultz, {Jacob Pagh}",
year = "2007",
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language = "English",
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pages = "525--552",
journal = "Journal of Sandwich Structures & Materials",
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}

Application and Analysis of Sandwich Elements in the Primary Structure of Large Wind Turbine Blades. / Berggreen, Christian; Branner, Kim; Jensen, Jacob Fisker; Schultz, Jacob Pagh.

In: Journal of Sandwich Structures and Materials, Vol. 9, No. 6, 2007, p. 525-552.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Application and Analysis of Sandwich Elements in the Primary Structure of Large Wind Turbine Blades

AU - Berggreen, Christian

AU - Branner, Kim

AU - Jensen, Jacob Fisker

AU - Schultz, Jacob Pagh

PY - 2007

Y1 - 2007

N2 - The present work studies the advantages of applying a sandwich construction as opposed to traditional single skin composites in the flanges of a load carrying spar in a future 180 m wind turbine rotor. A parametric finite element model is used to analyze two basic designs with single skin and sandwich flanges, respectively. Buckling is by far the governing criterion for the single skin design. Introducing a sandwich construction results in a globally more flexible structure making tower clearance the critical criterion. Significant weight reduction up to 22.3% and increased buckling capacity is obtained. Moreover, the study showed that proper choice of core material is important to prevent face wrinkling. Geometric nonlinear analysis showed sensitivity to imperfections. A consistent submodeling technique is presented for verifying the response from the global model in any section of interest.

AB - The present work studies the advantages of applying a sandwich construction as opposed to traditional single skin composites in the flanges of a load carrying spar in a future 180 m wind turbine rotor. A parametric finite element model is used to analyze two basic designs with single skin and sandwich flanges, respectively. Buckling is by far the governing criterion for the single skin design. Introducing a sandwich construction results in a globally more flexible structure making tower clearance the critical criterion. Significant weight reduction up to 22.3% and increased buckling capacity is obtained. Moreover, the study showed that proper choice of core material is important to prevent face wrinkling. Geometric nonlinear analysis showed sensitivity to imperfections. A consistent submodeling technique is presented for verifying the response from the global model in any section of interest.

KW - wind turbine blades

KW - sandwich

KW - sensitivity analysis

KW - Buckling

KW - FEA

U2 - 10.1177/1099636207069071

DO - 10.1177/1099636207069071

M3 - Journal article

VL - 9

SP - 525

EP - 552

JO - Journal of Sandwich Structures & Materials

JF - Journal of Sandwich Structures & Materials

SN - 1099-6362

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ER -