压-压疲劳载荷下CFRP层合板表面红外辐射特征

doi:10.7527/S1000-6893.2020.24239

Abstract

Abstract: To explore the damage evolution rule of impact-damaged CFRP laminates under cyclic alternating load, we studied the surface infrared radiation characteristics of damaged CFRP laminates during fatigue based on the thermodynamic coupling effect. Using the infrared thermal image method, we analyzed the heat map sequences and temperature data of the damaged CFRP laminated plate during fatigue with the pressure-pressure fatigue test simulating the alternating load. Results show that with the increase of fatigue times, the damage evolves along the vertical direction of the fatigue load, the color of the hot spot gradually deepens, the initial impact damage slowly evolves into an elliptical shape, and finally a "sharp point" appears at the end of the hot spot. The maximum surface temperature difference of the specimen as a whole shows the rule of "fast rise-slow rise-fast rise", finally leading to a jump. The "sharp point" on the hot spot and the maximum surface temperature difference jump can be regarded as the precursor of structural fatigue failure. When the CFRP laminates are damaged, the maximum surface temperature difference is mainly related to the types of the fiber and the matrix, while the laying-out mode of the specimens has no significant influence on the types of fiber matrix. The study reveals the damage evolution law of CFRP laminates under fatigue load after impact, laying a foundation for the residual fatigue life evaluation and damage tolerance design of aircraft composite structures.

Key words: CFRP, constant amplitude fatigue tests, infrared thermal imaging, fatigue life, heat map sequences

CLC Number:

V45
TB332

YANG Zhengwei, ZHAO Zhibin, LI Yin, SONG Yuanjia, KOU Guangjie, LI Lei, CHENG Pengfei. Infrared radiation characteristics of CFRP laminate surface under compressive fatigue load[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(5): 524239-524239.

References 24

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Infrared radiation characteristics of CFRP laminate surface under compressive fatigue load

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