The intact and skin-core flaw with a diameter of 30mm samples of functional composite electromagnetic absorbing honeycomb sandwich were designed and prepared removed the skin of the samples' skin-core debonding area at a slope of 1∶15 by a pneumatic grinding tool.The J-116A adhesive film and QW280/5429 prepreg patch were laid for bonding repair after the flaws were removed,the repair area of the samples were heated and solidified by using a hot bonder.Ultrasonic nondestructive testing,electromagnetic reflectivity in the frequency range of 1～18GHz,flat tensile strength test and bending strength test of the samples were carried out.The results showed that,the recovery rate of repaired samples' effective electromagnetic absorption bandwidth reached to 96.8%,the recovery rate of flat tensile strength reached to 85.5%,the recovery rate of bending strength reached to 95.1%,the adhesive film,prepreg patch and skin-core bonding in repair area on the samples were of good quality.
Ji Guoliang, Li Yiwen, Xuan Shanyong, Wei Xiaolong, Chen Ge
. Study on repair technology of skin-core flaw in functional composite sandwich structure[J]. New Chemical Materials, 2021
, 49(12)
: 227
-231
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.12.048
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