Abstract: According to the sample preparation process of tensile properties test of carbon fiber multifilament, the influence factors of tensile properties test values of T300B, T700SC and T800H were studied by using different matrix resins and applying different tow curing tension. The results show that the test value of tensile properties of carbon fiber multifilament is not obviously related to the viscosity of matrix resin, but closely related to the elongation at break of matrix resin. Under the condition that the elongation at break of matrix resin does not exceed 4 times of the tested fiber, the higher the elongation at break of matrix resin is, the more accurate the test value of mechanical properties of carbon fiber multifilament is. The mechanical properties of carbon fiber multifilament can be improved by appropriately increasing the curing tension of carbon fiber during sample preparation. The larger the carbon fiber tow is, the higher the curing tension is required.

Key words: carbon fiber, multifilament, tensile property