关键词: 吸波蜂窝, 修复技术, 电磁性能, 力学性能, 综合评价

Abstract: Microwave-absorbing honeycomb is a commonly used electromagnetic (EM) wave absorbing material of advanced aircrafts, but damage during service will lead to degradation in both EM wave absorbing and mechanical performances. The vertical reflectivity and in-plane compression properties of repaired microwave-absorbing honeycomb sandwich (AHS) were studied by simulation and experiments, and a new evaluation index for the EM repairability of damaged AHS S11-md, defined as the maximum difference of S11 between the repaired and undamaged structure, is proposed in this paper. The effects of bonded repair technology on the mechanical and EM repairability of AHS is analyzed, and a comprehensive evaluation on mechanical and EM repairability is made based on the fuzzy comprehensive evaluation method. The results show that both patch and scarf repair will lead to an increase of structural reflectivity and the shift of absorbing center frequency to low frequency. The S11-md increases with the increase of repair area. The mechanical repairability is better than EM repairability after patch and scarf repair. Single-sided scarf repair with scarf slope of 20:1 is the repair scheme with best mechanical and EM comprehensive repairability.

Key words: Absorbent honeycomb, Repair technology, Electromagnetic property, Mechanical property, Comprehensive evaluation