Evaluating Structural Failure of Load-Carrying Composite Box Beams with Different Geometries and Load Conditions

Jing Tang, Xiao Chen*, Ke Yang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The load-carrying component of wind turbine blades is a composite box beam that often consists of two spar caps and two shear webs. Local buckling of such beams usually leads to failure of spar caps and/or shear webs. As the failure modes change with cross-sectional geometries and load conditions, it is of interest to develop a method for efficient structural failure evaluation. As a correlation exists between linear buckling response and the potential structural failure, this study presents comprehensive numerical studies on the box beams with different external shapes and layer thicknesses to establish buckling mode maps that can be useful for the preliminary structural design. The results show that the changes of cross-sectional aspect ratio affect the buckling strength more than the change of the weight or the material usage when the spar cap buckling dominates the failure. Larger curvature of spar caps can significantly improve the buckling strength due to better resistance to the cross-sectional flattening. The evaluation method only uses the modeling techniques readily available in common commercial FE software, and no in-house user subroutines is needed, thus allowing the failure evaluation to be performed efficiently in the early design of the load-carrying box beams in wind turbine blades.
Original languageEnglish
JournalApplied Composite Materials
Volume26
Issue number4
Pages (from-to)1151-1161
Number of pages11
ISSN0929-189X
DOIs
Publication statusPublished - 2019

Keywords

  • Buckling mode
  • Buckling resistance
  • Composite blade
  • Finite element model
  • Load-carrying capacity

Cite this

@article{177832d1000d456a985d62157d5797f7,
title = "Evaluating Structural Failure of Load-Carrying Composite Box Beams with Different Geometries and Load Conditions",
abstract = "The load-carrying component of wind turbine blades is a composite box beam that often consists of two spar caps and two shear webs. Local buckling of such beams usually leads to failure of spar caps and/or shear webs. As the failure modes change with cross-sectional geometries and load conditions, it is of interest to develop a method for efficient structural failure evaluation. As a correlation exists between linear buckling response and the potential structural failure, this study presents comprehensive numerical studies on the box beams with different external shapes and layer thicknesses to establish buckling mode maps that can be useful for the preliminary structural design. The results show that the changes of cross-sectional aspect ratio affect the buckling strength more than the change of the weight or the material usage when the spar cap buckling dominates the failure. Larger curvature of spar caps can significantly improve the buckling strength due to better resistance to the cross-sectional flattening. The evaluation method only uses the modeling techniques readily available in common commercial FE software, and no in-house user subroutines is needed, thus allowing the failure evaluation to be performed efficiently in the early design of the load-carrying box beams in wind turbine blades.",
keywords = "Buckling mode, Buckling resistance, Composite blade, Finite element model, Load-carrying capacity",
author = "Jing Tang and Xiao Chen and Ke Yang",
year = "2019",
doi = "10.1007/s10443-019-09776-4",
language = "English",
volume = "26",
pages = "1151--1161",
journal = "Applied Composite Materials",
issn = "0929-189X",
publisher = "Springer Netherlands",
number = "4",

}

Evaluating Structural Failure of Load-Carrying Composite Box Beams with Different Geometries and Load Conditions. / Tang, Jing; Chen, Xiao; Yang, Ke.

In: Applied Composite Materials, Vol. 26, No. 4, 2019, p. 1151-1161.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Evaluating Structural Failure of Load-Carrying Composite Box Beams with Different Geometries and Load Conditions

AU - Tang, Jing

AU - Chen, Xiao

AU - Yang, Ke

PY - 2019

Y1 - 2019

N2 - The load-carrying component of wind turbine blades is a composite box beam that often consists of two spar caps and two shear webs. Local buckling of such beams usually leads to failure of spar caps and/or shear webs. As the failure modes change with cross-sectional geometries and load conditions, it is of interest to develop a method for efficient structural failure evaluation. As a correlation exists between linear buckling response and the potential structural failure, this study presents comprehensive numerical studies on the box beams with different external shapes and layer thicknesses to establish buckling mode maps that can be useful for the preliminary structural design. The results show that the changes of cross-sectional aspect ratio affect the buckling strength more than the change of the weight or the material usage when the spar cap buckling dominates the failure. Larger curvature of spar caps can significantly improve the buckling strength due to better resistance to the cross-sectional flattening. The evaluation method only uses the modeling techniques readily available in common commercial FE software, and no in-house user subroutines is needed, thus allowing the failure evaluation to be performed efficiently in the early design of the load-carrying box beams in wind turbine blades.

AB - The load-carrying component of wind turbine blades is a composite box beam that often consists of two spar caps and two shear webs. Local buckling of such beams usually leads to failure of spar caps and/or shear webs. As the failure modes change with cross-sectional geometries and load conditions, it is of interest to develop a method for efficient structural failure evaluation. As a correlation exists between linear buckling response and the potential structural failure, this study presents comprehensive numerical studies on the box beams with different external shapes and layer thicknesses to establish buckling mode maps that can be useful for the preliminary structural design. The results show that the changes of cross-sectional aspect ratio affect the buckling strength more than the change of the weight or the material usage when the spar cap buckling dominates the failure. Larger curvature of spar caps can significantly improve the buckling strength due to better resistance to the cross-sectional flattening. The evaluation method only uses the modeling techniques readily available in common commercial FE software, and no in-house user subroutines is needed, thus allowing the failure evaluation to be performed efficiently in the early design of the load-carrying box beams in wind turbine blades.

KW - Buckling mode

KW - Buckling resistance

KW - Composite blade

KW - Finite element model

KW - Load-carrying capacity

U2 - 10.1007/s10443-019-09776-4

DO - 10.1007/s10443-019-09776-4

M3 - Journal article

VL - 26

SP - 1151

EP - 1161

JO - Applied Composite Materials

JF - Applied Composite Materials

SN - 0929-189X

IS - 4

ER -