Comparison of Combined and Separated-Combined Schemes of Ultrasonic Testing of Carbon Fiber Reinforced Plastic

Nowadays polymer composite materials (PCM) are increasingly used in various industries. The widespread introduction of PCM is associated with the need to ensure reliable and safe operation of PCM structures that requires the development and application of non-destructive testing methods. The analysis of the existing PCM testing methods has shown that the most promising of these is the ultrasonic testing method. It has the greatest sensitivity to the characteristic technological and operational defects in the composite. The results of studies on ultrasonic testing of PCM (CFRP) samples with artificial and technological defects of various sizes are presented in this paper. Test samples of a 4.0 mm thickness had inherent defects in the form of PTFE films with a diameter of 4, 8 and 12 mm. The films simulated technological defects that might occur in manufacturing due to deviations during forming or non-compliance with technological procedures. Experiments were carried out on 4.0 mm thick samples with artificial defects in the form of flat-bottomed reflectors that simulated delamination and improper bonding. Flat-bottomed artificial reflectors with a diameter of 3, 4, 5, 6, 8, 10 and 12 mm manufactured by counter boring at a 2.0 mm depth were meant to assess the sensitivity; while reflectors with a diameter of 8 mm at a depth of 3.5, 2.0 and 0.5 mm were used to assess the possibility of defect detecting in the near-surface zones. The advantages and disadvantages of combined and separated-combined testing methods were considered through theoretical and experimental studies.

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