含损伤吸波蜂窝结构力电性能修复与综合评价OA

Microwave-absorbing honeycomb is a commonly used Electromagnetic(EM)wave absorbing material of advanced aircraft,but damage during service will lead to degradation in both EM wave absorbing and mechanical per-formance.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,defined as the maximum difference 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 are 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 evaluation index for the EM repairability increases with the in-crease 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 the best mechanical and EM comprehensive repairability.