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PARAMETRIC STUDY OF SANDWICH PANEL BUCKLING IN COMPOSITE WIND TURBINE BLADES
Shicong Miao, Steven Donaldson, and Elias Toubia
CONCLUSIONS
A finite element based study of the buckling of composite sandwich
panels (as seen in wind turbine blade shells) was conducted to examine
the sensitivity of critical buckling load and strain levels to multiple
design parameters, including the core transverse modulus, core
thickness, number of facing layers, panel width, and panel curvature.
The results of this project provide a more efficient preliminary design
method to assess sandwich panel buckling in wind turbine blade design.
The results from this study in practical design optimization would
involve assessing the variables listed above, then comparing the cost
and weight of the various solutions toward the design objectives such
as minimizing cost or weight.
ACKNOWLEDGEMENT
The discussions with Fred Stoll of Milliken & Co. are gratefully
appreciated.
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Table 1: Candidate Material Properties
Face/Core E 1 E 2 E 3 ν 12 ν 13 ν 23 G 12 G 13 (G 1 ) G 23 (G 2 )
MPa MPa MPa MPa MPa Mpa
E_TLX 5500 21400 10000 0.4 6000 3740 3740
(face sheet)
M1 50 50 50 0.33 0.22 0.1 20 20 20
M2 100 100 100 0.2 0.2 0.2 30 50 50
M3 284 250 210 0.39 0.25 0 146 108 72
M4 400 400 400 0.2 0.2 0.2 250 250 250
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