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홍헌석,우호길,이규석 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
The work presents an analysis of the contact problem between the two frictional elastic bodies. Under the assumption of the unbonded and no penentrating, the contact problem was described as the total potential energy equation. The solution was obtained by the numerical approximation technique finite element method, and iterative method. Several examples were solved to test the presented method. First example is the contact problem between a elastic punch and plate. Second is the contact problem between a elastic connecting rod and shaft. The results were compared with other numerical and analytic solution, and the results were concided with them.
고온용 Circuit-analog 전파흡수구조의 350℃ 및 열 수분 환경에서의 적용성 평가
장민수,김호범,홍헌석,Min-Su Jang,Ho-Beom Kim,Heon-Suk Hong 한국복합재료학회 2023 Composites research Vol.36 No.5
We proposed a high-temperature circuit-analog radar absorbing structures (CA-RAS), and evaluated radar absorption performance and tensile properties in 350℃ and a hot-wet environment. The CA-RAS was implemented with a glass/cyanate ester composites and a square resistive pattern layer, and reflection loss was measured by 350℃ and after exposure of hot-wet condition using free space measurement. And the tensile strength at 350℃ and after exposure of hot-wet condition was measured according to the ASTM D638. The proposed CA-RAS showed a 4 GHz of -dB bandwidth and -20 dB of a peak value at 350℃. In addition, there was no deterioration in absorption performance after exposure to a hot-wet condition. The tensile strength value of more than 95% compared to the strength of the glass/cyanate ester composite was confirmed at 350℃ and after exposure of hot-wet condition. Through this, the applicability of CA-RAS proposed in this study was confirmed as a load bearing structure for stealth weapon exposed to high temperature and hot-wet environment.