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http://dx.doi.org/10.7234/composres.2022.35.6.469

Evaluation of the Absorbing Performance of Radar-absorbing Structure with Periodic Pattern after the Low-velocity Impact  

Joon-Hyung, Shin (School of Mechanical and Aerospace Engineering, Gyeongsang National University)
Byeong-Su, Kwak (School of Mechanical and Aerospace Engineering, Gyeongsang National University)
Publication Information
Composites Research / v.35, no.6, 2022 , pp. 469-476 More about this Journal
Abstract
In this paper, the microwave absorbing characteristics after the impact of the radar-absorbing structure (RAS) consisting of periodic pattern sheet (PPS) and glass fiber-reinforced plastic (GFRP) were experimentally investigated. The fabricated RAS effectively absorbed the microwave in the X-band (8.2-12.4 GHz). In order to induce the damage to the RAS, a low-velocity impact test with various impact energy of 15, 40, and 60 J was conducted. Afterward, the impact damage was observed by using visual inspection, non-destructive test, and image processing method. Moreover, the absorbing performance of intact and damaged RAS was measured by the free-space measurement system. The experiment results revealed that the delamination damage from the impact energy of 15 J did not considerably affect the microwave absorbing performance of the RAS. However, fiber breakage and penetration damage with a relatively large damaged area were occuured when the impact energy was increased up to 40 J and 60 J, and these failures significantly degraded the microwave absorbing characteristics of the RAS.
Keywords
Multi-functional composites; Radar-absorbing structure; Periodic pattern sheet; Low-velocity impact; Return loss;
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Times Cited By KSCI : 2  (Citation Analysis)
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