Page 432 - Wind Energy Handbook

406 COMPONENT DESIGN

Strength-to- ratio, stiffness 10 3 (ó cd =E) 3 6.1 2.6 3.3 3.6 1.54 3.2

E
Young’s Modulus, (GPa) 32.5 142 10 15 210 69

Compression strength, design ó cd (MPa) (ignoring 197 buckling) 374 33 54 323 218

Materials factor material ª mu

Blade safety for strength, 2.94 2.94 1.5 1.5 ª my 1.1 1.1

Turbine Partial ó y

Wind Ultimate compression ó cu strength, (MPa) 580 1100 50 81 strength, 355 240

Different Yield

for
Ratios volume fibre volume fibre

Strength-to-stiffness 50% with 60% with ply lay-up 510) Fe AA6082 alloy

Design laminate UD 80% and fibre/epoxy UD and laminate laminate (Grade steel aluminium

7.4 Glass/polyester fraction fraction Khaya/epoxy Birch/epoxy High-yield
Table Material Carbon Weldable