Conclusion
Lay-up design and verified analysis of stiffness and strength are the very important work in the design
of large scale composite wind turbine blade. An E-glass/epoxy composite blade for a 1.2MW HAWTS
was designed and analyzed in this paper. According to stress calculating results and experience, four
different kinds of fiber lay-up schemes are designed. Aimed the maximum structure strength and stiffness
as final goal, through stress-strain analysis of different structures, the optimal lay-up schema
[0°/±60°/90°]S was determined. The verified analysis of stiffness and strength of the optimal lay-up
schema is performed under extreme load conditions. Numerical calculation shows that the curve of
placement distribution is approximately linear, and the maximum deflection of the blade tip satisfied the
design stiffness demand. The maximum stress criterion is adopted, and the maximum first principal stress
and shearing stress of the blade root both satisfy the design strength demand.