Electromagnetic Wave Absorption and Bending Properties of Double-Layer Honeycomb 3D Woven Composites: Experiment and Simulation

In order to solve the problems of honeycomb sandwich structure electromagnetic wave absorbing composites with easy delamination, low strength, and a narrow absorption frequency band, a double-layer honeycomb 3D woven electromagnetic wave absorbing composite was designed and prepared. CST electromagnetic simulations and mechanical finite element simulations were combined with experimental analysis, respectively. The electromagnetic wave absorption properties and bending properties of the double-layer honeycomb 3D woven electromagnetic wave absorbing composite were revealed, and the electromagnetic wave absorption mechanism was elucidated. The results show that the lowest peak of reflection loss obtained from both simulation and experiment of electromagnetic wave absorption property occurs in the X-band with the values of 10.78 GHz and 9.28 GHz, respectively. The lowest reflection loss is -24.35 dB and -23.5 dB, respectively. The simulation results were in good agreement with the experimental results. The maximum loads obtained from simulation and experiment for the bending property were 2696.28 N and 2271.07 N, respectively. There is no obvious delamination damage to the yarn, and the material has good resistance to delamination. The structural-functional integration of load-bearing and electromagnetic wave absorption in double-layer honeycomb 3D woven electromagnetic wave absorbing composite will have great development potential in civil and military fields.