Page 408 - Wind Energy Handbook

382 COMPONENT DESIGN

Panel stability parameter E/(UCS) 2 (MPa) 1 0.07 0.1

Stiffness to ratio weight E/s.g. (GPa) 20.5 18

Young’s Modulus, E (GPa) [2] 38 33.5

Mean fatique strength as percentage of UCS 19% 21%

Mean fatigue at 10 7 strength cycles (amplitude) (MPa) 140 [3] 120

Compressive strength to ratio UCS/s.g. 390 GRP given above 310

Blades weight

Wind-turbine Specific gravity (s.g.) 1.85 1.85

for Ultimate compressive strength (UCS) (MPa) composites, 720 [1] Properties are generally very close to those for 580
Materials minimum for metals)

of Ultimate tensile strength (UTS) (MPa) (Mean for 860–900 [1] [2] 690–720
Properties

Structural – running ply with fraction and UD lay-up with ply laminate with 50% fibre volume running

7.1 (NB: UD denotes unidirectional fibres i.e., all fibres longitudinally) Glass/polyester 50% fibre volume Glass/epoxy 50% fibre volume fraction and UD lay-up Glass/polyester fraction and 80% of fibres longitudinally
Table Material 1 2 3