Research on Stress Detection Method of Carbon Fiber Composites Based on Critical Refraction Longitudinal Wave

doi:10.3901/JME.260036

Abstract

Abstract: Carbon fiber reinforced polymer(CFRP) has been widely applied in defense, civil life and other fields, and has become an indispensable component in the process of high-quality national development. Efficient and accurate detection and evaluation of the service status of composite material structures are crucial for production safety. Ultrasonic non-destructive testing, with its advantages of rapidity and accuracy, is widely used in stress detection. By studying the propagation law of critically refracted longitudinal waves (LCR) in orthotropic materials and establishing a CFRP stress detection model based on the equivalent stiffness matrix, the theoretical derivation of the detection method for calibrating the plane stress coefficient of anisotropic materials is carried out. Through finite element analysis, the relationship between the sound velocity, sound field directivity, LCR excitation angle and penetration depth of CFRP materials is analyzed, simulated and tested, achieving quantitative characterization of stress. Taking T700 carbon fiber composite materials as the research object, an ultrasonic stress detection system is built to conduct LCR wave propagation characteristic tests and stress-induced ultrasonic detection tests in CFRP, which are consistent with the finite element simulation results. The ultrasonic stress coefficient is calibrated and verified by uniaxial tensile prestress loading tests, with the maximum deviation of the ultrasonic stress coefficient not exceeding 5%. The research results provide effective support for the structural stress detection of composite materials.

Key words: carbon fiber composites, critically refracted longitudinal wave, penetration depth, stress detection, stress coefficient

CLC Number:

TB551

PAN Qinxue, ZHAO Guangyuan, YU Haoshen, XU Jiaqi. Research on Stress Detection Method of Carbon Fiber Composites Based on Critical Refraction Longitudinal Wave[J]. Journal of Mechanical Engineering, 2026, 62(2): 48-60.

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