METHOD FOR CONTROLLING CONTINUITY IN MULTI-LAYERED ADHESIVE CONNECTIONS OF STRUCTURAL ELEMENTS OF AIRCRAFTS MADE OF HETEROGENEOUS MATERIALS Russian patent published in 2021 - IPC G01N29/04 G01N29/36 

FIELD: controlling.

SUBSTANCE: area of application: for non-destructive quality control of adhesive connections of heterogeneous parts. The substance of the invention consists in the fact that an ultrasonic fault detector is calibrated by samples simulating multi-layered connection "ceramics - adhesive connection - PCM (polymer composite material) - adhesive connection - metal" with artificially created glue line defects, wherein the reverberation fluctuation amplitude is adjusted on the control object to the level of reverberation fluctuations in the sample, ultrasonic waves are then emitted into the adhesive connections of the multi-layered connection, the reverberation fluctuations are received if glue line defect is present, then the scanning range is adjusted so that reverberation fluctuations are within the screen of the fault detector, the scanning range is analysed and a conclusion is made based on the presence of reverberation fluctuations indicating a glue line defect of the multi-layered adhesive connection of the structure of aircrafts, also to confirm the dimensions of the glue line defect of the adhesive multi-layered connection, found by the reverberation method, the amplitude shadow ultrasonic method is used, wherein ultrasonic waves introduced into the multi-layered adhesive connection by means of a direct emitting ultrasonic piezoelectric transducer from the side of the ceramics are recorded by a direct receiving ultrasonic piezoelectric transducer located on the opposite side of the multi-layered adhesive connection in the absence of a glue line defect, or not recorded if a glue line defect is present due to the shadowing thereof by the glue line defect located on the propagation path of the ultrasonic waves, wherein the ultrasonic waves are generated in the frequency range from 2.25 MHz to 3.5 MHz, and the misalignment of the direct emitting and receiving ultrasonic piezoelectric transducers should not be greater than half the diameter of the piezoelectric elements thereof.

EFFECT: improved quality of ultrasonic control of adhesive connections between heterogeneous parts.

1 cl, 4 dwg