研究目的
Investigating the effectiveness of laser vibrometry and optical thermography in detecting defects in carbon-carbon composites.
研究成果
Complex diagnostics combining laser vibrometry and thermal control effectively detected all defects in the carbon-carbon composite, enhancing the accuracy and informative value of quality control. The study demonstrated the importance of method selection and wave direction in defect detection.
研究不足
The study's limitations include the dependence of control efficiency on the side of the plate selected for shooting and the direction of acoustic wave movement, which may affect defect detection.
1：Experimental Design and Method Selection:
The study employed thermal method and laser vibrometry for nondestructive testing of a carbon-carbon composite plate with impact damages.
2：Sample Selection and Data Sources:
A carbon-carbon sample from composite material 934-361 with dimensions 450х350х10 mm was used, featuring 12 impact damages of the same energy.
3：List of Experimental Equipment and Materials:
Equipment included a 1 kW halogen lamp with a parabolic reflector for heating, an OPTRIS PI640 camera for recording IR thermograms, and a PSV-500-3D-HV scanning laser Doppler vibrometer from Polytec for vibrometry.
4：Experimental Procedures and Operational Workflow:
The sample was heated for 7 s with a frame rate of 10 Hz for thermal control. Vibrometry involved acoustic vibrations induced by a piezoceramic transducer and scanning in the frequency range from 5 Hz to 100 kHz.
5：Data Analysis Methods:
Data were processed using principal component analysis, Fourier method, and Fast Fourier Transform for thermal control and vibrometry, respectively.
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