Abstract: The pultruded glass fiber sheets with different storage times and environments and polishing methods were selected respectively. After adding biaxial fabrics between the sheets,the composite material samples were prepared by VARTM technology,and the factors affecting the interface strength of pultruded glass fiber sheets for wind power blades were studied. After the sample preparation was completed,the macroscopic interface strength performance and microscopic morphology of the pultruded glass fiber sheet interface were tested successively. The test results indicate that as the storage time increases,the interface strength of the pultruded glass fiber sheets decreases,and subsequently maintains a stable level;After polishing with 80,120,and 240 grit sandpaper,the surface roughness of the pultruded glass fiber sheets significantly changes. The smaller the roughness,the smaller the interface strength,and the initial interface strength of the pultruded glass fiber sheets cannot be restored after polishing. In addition,under different storage temperatures and humidities,the impact on the interface strength of the pultruded glass fiber sheets is relatively small.

Key words: pultruded glass fiber sheets, storage time, roughness, interface strength