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http://dx.doi.org/10.7234/kscm.2006.19.1.029

Fabrication of Radar Absorbing Shells Made of Hybrid Composites and Evaluation of Radar Cross Section  

Jung, Woo-Kyun (서울대학교 기계항공공학부 대학원)
Ahn, Sung-Hoon (서울대학교 기계항공공학부)
Ahn, Bierng-Chearl (충북대학교 전기컴퓨터공학부)
Park, Seoung-Bae (충북대학교 전기컴퓨터공학부)
Won, Myung-Shik (국방과학연구소)
Publication Information
Composites Research / v.19, no.1, 2006 , pp. 29-35 More about this Journal
Abstract
The avoidance of enemy's radar detection is very important issue in the modem electronic weapon system. Researchers have studied to minimize reflected signals of radar. In this research, two types of radar absorbing structure (RAS), 'C'-type shell and 'U'-type shell, were fabricated using fiber-reinforced composite materials and their radar cross section (RCS) were evaluated. The absorption layer was composed of glass fiber reinforced epoxy and nano size carbon-black, and the reflection layer was fabricated with carbon fiber reinforced epoxy. During their manufacturing process, undesired thermal deformation (so called spring-back) was observed. In order to reduce spring-back, the bending angle of mold was controlled by a series of experiments. The spring-back of parts fabricated by using compensated mold was predicted by finite element analysis (ANSYS). The RCS of RAS shells were measured by compact range and predicted by physical optics method. The measured RCS data was well matched with the predicted data.
Keywords
Radar absorbing structure, RAS; Radar cross section, RCS; Hybrid composite materials; Spring-back compensation;
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