sentences:  In light of these failure modes and increasingly larger blade systems, there has been continuous effort toward developing cost-effective materials with higher strength-to-mass ratios.To extend the current 20 year lifetime of blades and enable larger area blades to be cost-effective, the design and materials need to be optimized for stiffness, strength, and fatigue resistance.The majority of current commercialized wind turbine blades are made from fibre-reinforced polymers (FRPs), which are composites consisting of a polymer matrix and fibres.