Through theoretical derivation and numerical simulation, the vibration characteristics of different repaired structures of carbon fiber composite laminates under the influence of hygrothermal environment were studied. Based on the Hamilton principle and the Mindlin-Reissner plate theory and considering the equivalence of hygrothermal expansion, a constitutive equation of multi-degree-of freedom composite laminates in the hygrothermal environment was established, and the vibration governing equation of laminates in the hygrothermal environment was solved by using the finite element method. A finite element model of bonded repaired structure was established by ABAQUS. The vibration characteristics of the single- and double-sided bonded repaired structures with and without additional patches were compared from the perspective of vibration mode analysis, and the effects of temperature, humidity, and humiture on the vibration characteristics of different bonded repaired structures were discussed. The results show that under the influence of hygrothermal effect, laying additional patches can avoid excessive local deformation in the bonded area, improve the stiffness and stability of the structure, and delay the occurrence of hygrothermal buckling. The double-sided bonded repaired structure with additional patches can avoid additional bending of the structure and reduce the burden of the adhesive layer. The combined effect of temperature and humidity is greater than the single effect of temperature or humidity on composite laminates, and the sensitivity of double-sided bonded repair structures with additional patches to the effect of temperature and humidity is lower than that of single-sided bonded repair structure.
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