| Citation: | HE Cunfu, LI Yongkun, LYU Yan, et al. Finite element simulation of ultrasonic reflection/transmission characteristics for composite bonded joints with thick adhesive layers[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(9): 1721-1728. doi: 10.13700/j.bh.1001-5965.2020.0305(in Chinese)
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For composite bonded joints with thick adhesive layers, finite element method is applied to calculate the ultrasonic reflection/transmission coefficients when bonding interfaces and cohesion of adhesive layers are degraded. In the simulation model, the boundary conditions of the spring model used in conventional theoretical derivations are modeled by using the physical field boundary namely elastic thin layer, and the cohesive state of the adhesive layer is simulated by changing the elastic constants of it. The simulation results show that the frequency spectrum curve of reflection/transmission coefficients will shift to the low frequency side and the angular spectrum curve of reflection/transmission coefficients will shift to the large angle side with the increase of degradation degree of bonding interfaces. In addition, when the degradation of the cohesion of adhesive layers is getting worse, the shift tendency of the corresponding frequency and angular spectrum curve of reflection/transmission coefficients is consistent with that when degradation on bonding interfaces occurs. The problem of simulating bonding interfaces and structural adhesive's cohesion layers in composite bonded joints with thick adhesive layers by finite element method is solved, and the simulation results are in good agreement with theoretically calculated results.
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