Postbuckling Analysis of a Wind Turbine Blade Substructure

[+] Author and Article Information
Thomas M. Hermann, Dharmaraj Mamarthupatti, James E. Locke

National Institute for Aviation Research, Wichita State University, Wichita, KS, 67260-0093

J. Sol. Energy Eng 127(4), 544-552 (Jul 12, 2005) (9 pages) doi:10.1115/1.2037093 History: Received March 02, 2005; Revised July 12, 2005

Postbuckling analysis of composite laminates representative of wind turbine blade substructures, utilizing the commercial finite element software ANSYS , is presented in this paper. The procedure was validated against an existing postbuckling analysis. Three shell element formulations, SHELL91, SHELL99, and SHELL181, were examined. It was found that the SHELL181 element with reduced integration should be used to avoid shear locking. The validated procedure was used to examine the variation of the buckling behavior, including postbuckling, with lamination schedule of a laminate representative of a wind turbine blade shear web. This analysis was correlated with data from a static test. A 100% postbuckling reserve in a composite structure representative of a shear web was quantified through test and analysis. The buckling behavior of the shear web was improved by modifying the lamination schedule to increase the web bending stiffness. Modifications that improved the buckling load of the structure did not always equate to improvements in the postbuckling reserve.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Verification analysis boundary conditions

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Figure 2

Linear first buckling mode

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Figure 3

Correlation of end shortening deflection

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Figure 4

Correlation of out-of-plane deflection

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Figure 5

Correlation of longitudinal surface strain

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Figure 6

Transverse shear stress, τxz, in the failure layer

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Figure 7

Sketch of the initial and trimmed B3 beam

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Figure 8

Failure of the B3 beam

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Figure 9

I-beam analysis boundary conditions

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Figure 10

B3 beam cross-section

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Figure 11

First and second linear buckling modes of the B3 beam, right half

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Figure 12

Shear web postbuckling correlation with experiment

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Figure 13

Deformation at collapse of the Baseline beam, right half

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Figure 14

Postbuckling of the shear web

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Figure 15

Deformation at collapse, right half




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