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| Ultrasonic Nondestructive Evaluation of CFRP Composites after Thermo-Oxidative Aging |
| Received:December 31, 2024 Revised:January 24, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.03.003 |
| KeyWord:CFRP composite thermo-oxidative aging microdamage ultrasonic nondestructive evaluation |
| Author | Institution |
| LI Yunpeng |
NDT & E Laboratory, Dalian University of Technology, Liaoning Dalian , China |
| XU Zhenye |
The Aeronautical Science Key Lab for High Performance Electromagnetic Windows, The Research Institute for Special Structures of Aeronautical Composite AVIC, Jinan , China |
| ZOU Ye |
NDT & E Laboratory, Dalian University of Technology, Liaoning Dalian , China |
| JIN Shijie |
The Aeronautical Science Key Lab for High Performance Electromagnetic Windows, The Research Institute for Special Structures of Aeronautical Composite AVIC, Jinan , China |
| LUO Zhongbing |
NDT & E Laboratory, Dalian University of Technology, Liaoning Dalian , China |
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| Abstract: |
| The damage of carbon fiber reinforced plastic(CFRP) during long-term aging would lead to the deterioration of mechanical properties of large components, which seriously threatens the service reliability of large components. The thermo-oxidative aging of T300/AG-80 was studied based on material analysis and ultrasonic pulse-echo method and the evolution of acoustic properties was analyzed to explore the feasibility of nondestructive evaluation of early-stage damage. When the environmental temperature was 150 ℃, the weight loss ratio of the CFRP laminate increased rapidly first, and then increased slowly. Accordingly, the whole process was divided into three stages:initial, middle and later stages. The corresponding longitudinal wave velocity and attenuation coefficients in time and frequency domains were extracted. It was found that the velocity decreased first, then increased and finally decreased. The attenuation coefficients corresponding to the center frequencies of the first bottom echo (about 6 MHz) and the second bottom echo (about 4 MHz) were negatively correlated with the wave velocity, while the attenuation coefficients in time domain and low frequency (about 2 MHz) did not change significantly. The mechanism of thermo-oxidative aging and the corresponding acoustic response are discussed in combination with microstructure analysis. It is found that the three stages respectively correspond to volatilization of low molecular weight substances such as water molecules, post-cure effect of resin matrix, interfacial damage and fracture of molecular chain. As a consequence, damages such as pores, interfacial cracks and post-curing of resin result in comprehensive effects on ultrasonic propagation behaviors. The results would provide a reference for nondestructive evaluation of early-stage aging damage of composites. |
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