Based on damages probably caused by the process of production of 5228A/ CF3031 laminates, 5
kinds of defective samples were designed and produced, including the exceeding standard aperture(ESA), the elliptical
aperture(EA), the layering aperture(LA), the overly polishing aperture(OPA) and the layering fringe(LF),
and glue-injection method was proposed for restoration. ASTM standard is used to test the strength of tensile, compression,
inflexion, and longitudinal transverse and inter laminar shear of original, defective and repaired samples,
and then optical microscope was used for the observation. The result indicated that ESA has more negative impact on
the tensile strength, compression, inflexion of samples, and strength of these defective samples respectively decreased
by 11. 1%, 13. 8%, 14. 4%; OPA creates more harmful effects on the longitudinal transverse sheared strength, and
strength of these defective samples decreased by 25. 6%; inter laminar sheared strength is more vulnerable to the LF,
and strength of these defective samples decreased by 27. 3%. Additionally, the strength of all the five samples is improved
to a certain degree due to the application of glue-injection method. The improvement of laminates resistance to
small deformation (tensile, compression and inter laminar shear) for laminates is more significant than large deformation
(inflexion and longitudinal transverse shear).