Influence of microwave electromagnetic field frequency on the characteristics of the damage surface during strength testing of thermosetting and thermoplastic CFRPs

A comparative study of the effect of microwave electromagnetic fields with frequencies of 915 and 2450 MHz on changes in the structure of the damage surface during interlayer shear testing of cured carbon fiber reinforced plastic samples formed using FDM technology from composite filaments based on PEEK superstructural thermoplastic and by the vacuum infusion method based on ED-20 thermosetting resin with PEPA hardener was performed.It was shown that regardless of the type of binder, microwave exposure helps to reduce the volume of voids formed as a result of delamination of the matrix from the filler during testing. The greatest effect (2 or more times) is achieved for the epoxy binder at a frequency of 2450 MHz. For the PEEK binder, the effect of the radiation frequency is less pronounced and in the studied temperature range it can be considered insignificant.