Abstract: In the process of serving wind blades in desert, they will encounter extreme high temperature weather, and the inner cavity of the blades cannot dissipate heat, resulting in temperatures far higher than the environment temperature. With the increasing installation of wind generation units in desert area in the future, it is very important to study the high temperature resistance performance of wind blade composite materials in desert. In this paper, the mechanical properties of composite materials used in wind blade skin, spar cap and shell are studied at 60 ℃, which will provide reference for the selection and design of wind blade materials under desert environment. The test results show that the tensile and compressive properties of laminates for skin are degraded to a high degree after being treated at 60 ℃ for 3 h, and the reduction rates of tensile strength and compressive strength are 23.9% and 41%, respectively, but the V-shear strength of laminates is relatively low, which is 1.5%. The V-shaped shear strength of the tensioned plate for the spar cap decreased by 16.3%, while the tensile strength and compressive strength of the pultrusion plate decreased by 3.3% and 6.3%, respectively. The shear strength of PVC60 foam and Balsa sandwich composite for shell decreased by 31% and 4.2%, respectively.

Key words: wind blades, composite material, pultrusion plate, laminated plate, sandwich structure, performance, high-temperature resistance, desert