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PARAMETRIC STUDY OF SANDWICH PANEL BUCKLING IN COMPOSITE WIND TURBINE BLADES Shicong Miao, Steven Donaldson, and Elias Toubia Figure 12. Critical buckling strain versus panel curvature ratio for core material M1, M2, M3, M4 in 20, 30, 40mm core thickness and all five facing layers. Curved-section panel. 0.7 1.2 0.6 1 0.5 0.4 0.3 0.2 0.8 0.6 0.4 0.1 0.2 0 0 10 20 0 0 5 10 15 20 25 1.4 1.6 1.2 1.4 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 1.2 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 AcademyPublish.org – Journal of Engineering and Technology Vol.2, No.2 12
PARAMETRIC STUDY OF SANDWICH PANEL BUCKLING IN COMPOSITE WIND TURBINE BLADES Shicong Miao, Steven Donaldson, and Elias Toubia Figure 13. Critical buckling strain versus transverse shear modulus in 5%, 10%, 25% curvature, 20mm core, Curved panel, all 5 layers. Critical buckling strain ε (%) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 20mm Core 25% 10% 5% 20 70 120 170 220 Transverse shear modulus (Mpa) 5 layer 4 layer 3layer 2 layer 5 layer 4 layer 3layer 2 layer 1 layer 5 layer 4 layer 3layer 2 layer 1 layer PRELIMINARY DESIGN EXAMPLE Figure 14 shows a repeat of Figure 6 to be used as a design example. In this example, the critical buckling design strain has been previously chosen based on other factors ( maximum blade deflection, joining, damage tolerance, etc.), and required to be equal to or greater than 0.5%. Several combinations of core selection, core thickness, and facing thickness are depicted in Figure 14 (only three are shown of a possible 12 curve intersections): A. approximately 27mm thickness of core M4 with 5 facing layers; B. approximately 33mm thickness of core M3 with 1 facing layers; C. approximately 41mm thickness of core M4 with 2 facing layers; Based on the cost and weight of facing materials and core materials, the optimal choice can be made to minimize or balance the cost and the weight of the structure. Figure 14. Critical buckling strain versus core thickness for all five facing layers and all four core materials. Flat-section. 1m width sandwich panel. Critical buckling strain ε 1.2 1 0.8 0.6 0.5 0.4 0.2 M 1 M 2 b=1m A B 0 20 25 30 35 40 45 Core thickness 5 layer 4 layer 1 layer 2 layer 3 layer 4 layer 5 layer AcademyPublish.org – Journal of Engineering and Technology Vol.2, No.2 13
Page 1 and 2: AcademyPublish.org Volume 2 Issue 2
Page 3 and 4: PARAMETRIC STUDY OF SANDWICH PANEL
Page 11: PARAMETRIC STUDY OF SANDWICH PANEL
Page 17 and 18: A STUDY OF SIMPLIFIED SHALLOW WATER
Page 19 and 20: A STUDY OF SIMPLIFIED SHALLOW WATER
Page 21 and 22: ON BICRITERIA LARGE SCALE TRANSSHIP
Page 27 and 28: TRIBOLOGY OF HIGH SPEED MOVING MECH
Page 35 and 36: THE USE OF IRON IN PEAT WATER FOR F
Page 37 and 38: THE USE OF IRON IN PEAT WATER FOR F
Page 39 and 40: TRIBOLOGY OF HIGH-SPEED MOVING MECH
Page 45: Other access free resources from Ac

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