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안동규,문경제,정창균,한길영,양동열 대한기계학회 2007 環境管理學會誌 Vol.2007 No.5
The objective of this paper is to investigate the influence of impact conditions on the impact characteristics of the stainless sheet for the case of the fixed boundary conditions. In order to examine impact characteristics of the sheet, three-dimensional finite element analyses and impact tests have been performed. High speed tensile tests have been carried out to obtain strain-stress relationships including the effects of the strain rate. In order to improve an accuracy of the FE analysis, the hyper-elastic model and the damping factor have been introduced. The results of the FE analyses and the impact tests have been shown that the diameter of the impact head does not affect the absorption energy of the stainless sheet. In addition, it has been shown that the absorption rate of energy maintains almost <TEX>$82.5\;\sim\;83.5\;%$</TEX> irrespective of the impact energy level and the diameter of the impact head. From the results of FE analyses, the variation of stress and strain energy in the stainless sheet has been quantitatively examined.
딤플형 내부구조체를 가진 Isb 판넬의 정적 굽힘 특성
안동규,문경제,한길영 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
본 연구에서는 덤플형 내부 구조제를 가진 ISB 판넬의 굽힘 및 파손 특성을 분석/고찰하고자 한다. 딩플형 내부 구조체를 가진 ISB 판넬의 설계조건에 따른 변형 형상, 최대하중 및 최대하중에서의 변위와 같은 특성치 및 파손 형태를 분석하기 위하여 정적 3접 굽힘 시 험을 통한 하중-변위 곡선과 파손 형상을 얻었다. 또한, 본 실험 결과를 이용하여 ISB 판 넬 설계 변수의 굽힘 특성 및 파손 모드 영향성을 분석하였다. 본 연구 결과 딩플형 내부 구조체를 가진 ISB 판넬의 굽힘 및 파손 특성은 덤플형 내부구조체의 반경비와 ISB 판넬 의 재료 방향에 따라 제어 가능함을 알 수 있었다. The objective of this pater is to investigate into bending and failure characteristics of ISB panel with dimple shapes as inner structures. Through three-points bending test, the force-displacement curve and the failure shape are obtained to examine the deformation pattern, characteristic data including maximum load and displacement at the maximum load and failure pattern for the ISB panel. In addition, the influence of design parameters for ISB panel on the bending stiffness and failure mode has been found. From the results of the experiments, it has been shown that bending and failure characteristics of the ISB panel can be controlled by the ratio of radius and the direction of the material.
이종 추진제가 적용된 고체 추진기관의 추력성능예측에 대한 연구
김한준(Hanjun Kim),문경제(Kyungje Moon),조평기(Pyungki Cho) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.1
In the current study, the numerical method was established to predict the performance of a solid rocket motor with two kinds of propellants. On the basis of a numerical study, an internal ballistics analysis code was developed. To verify the internal ballistics analysis code two solid rocket motors were manufactured and tested. The accuracy and applicability of the internal ballistics code for dual-propellant solid rocket motor were verified by comparing the experimental results with the numerical calculation.
피라미드형 내부구조체를 가진 ISB 판넬의 접합형태에 따른 충격 특성 변화
안동규(Dong-Gyu Ahn),문경제(Gyung-Jae Moon),정창균(Chang-Gyun Jung),양동열(Dong-Yol Yang) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.9
ISB(Inner structured and bonded) panel with a pyramidal inner structure is actively developing to reduce the weight and to improve the crashworthiness of the material. The objective of this paper is to investigate into the variation of impact characteristics of ISB panels with a pyramidal inner structure according to joining types between skin sheets and inner structures. Several drop impact tests have been performed. In order to examine the impact characteristics at a drawing condition, drawing type of experimental set-up has been proposed. From the results of the experiments, the influence of joining types between skin sheets and the inner structures on the characteristics of the deformation, the energy absorption and the failure has been quantitatively examined. In addition, it has been shown that maximum load decreased and the maximum displacement increases as the joining type changes from the bonding to the welding. The results of the observation of the specimen have been shown that major wrinkles form in the minor crimping direction irrespective of the joining types. Through the comparison of the experimental results for bonding and welding specimens, it has been shown that the absorption energy of the bonded specimen is nearly 1.3-1.5 times of the welded specimen at the same displacement.
이중추력형 고체 추진기관 설계를 위한 이종추진제 적용 내탄도 해석
김한준(Hanjun Kim),문경제(Kyungje Moon) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 연구에서는 이종추진제를 적용한 이중추력형 고체 추진기관의 내탄도 해석 이론을 정립하였고 이 이론을 바탕으로 내탄도 해석 모델을 개발하였다. 이종추진제를 적용한 이중추력형 고체 추진기관의 내탄도 해석은 임의의 값의 이종추진제를 적용하여 수행하였고 그 결과를 분석하였다. 이를 통해 본 해석 모델이 이종추진제를 적용한 이중추력형 고체 추진기관의 내탄도 해석에 적용 가능성을 확인하였다. In this study, internal ballistic analysis theories of dual-thrust solid rocket motor using two kinds of propellant are found, and the theories are applied to develop internal ballistic analysis model. Internal ballistic analysis which is dual-thrust solid rocket motor using two kinds of propellant is carried out an applying of the random figures of two kinds of propellant and an analyze of the test results. Through this analytical model was able to an applying internal ballistic analysis for dual-thrust solid rocket motor using two kinds of propellant.
안동규(Dong-Gyu Ahn),문경제(Kyung-Je Moon),정창균(Chang-Gyun Jung),한길영(Gil-Young Han),양동열(Dong-Yol Yang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The objective of this paper is to investigate the influence of impact conditions on the impact characteristics of the stainless sheet for the case of the fixed boundary conditions. In order to examine impact characteristics of the sheet, three-dimensional finite element analyses and impact tests have been performed. High speed tensile tests have been carried out to obtain strain-stress relationships including the effects of the strain rate. In order to improve an accuracy of the FE analysis, the hyper-elastic model and the damping factor have been introduced. The results of the FE analyses and the impact tests have been shown that the diameter of the impact head does not affect the absorption energy of the stainless sheet. In addition, it has been shown that the absorption rate of energy maintains almost 82.5 - 83.5 % irrespective of the impact energy level and the diameter of the impact head. From the results of FE analyses, the variation of stress and strain energy in the stainless sheet has been quantitatively examined.
고정형 경계조건에서의 0.7 ㎜ SUS304H 판재의 충격에너지 흡수 특성
안동규(Dong-Gyu Ahn),문경제(Kyung-Je Moon),문형철(Hyung-Chul Moon),한길영(Gil-Young Han),정창균(Chang-Gyun Jung),양동열(Dong-Yol Yang) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The objective of this paper is to investigate into characteristics of the impact energy absorption of SUS304H sheet with thickness of 0.7 ㎜ for the case of the fixed boundary conditions. In order to examine into characteristics of the impact energy absorption, drop impact tests have been performed. Through the results of the experiments, the absorption rate of the impact energy and the deformation characteristics of the specimen have been quantitatively examined. From the results of the experiments, it has been shown that the diameter of the impact head does not affect the absorption energy of the SUS304H sheet. It is also found that the absorption rate of impact energy decreases with increasing of impact energy. In addition, it has been shown that the SUS304H sheet is fractured at the impact energy of 106.6 J when the diameter of the impact head is 10 ㎜.
안동규(Dong-Gyu Ahn),문경제(Kyung-Je Moon),김진석(Jin-Suk Kim),한길영(Gil-Young Han),정창균(Chang-Gyun Jung),양동열(Dong-Yol Yang) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The objective of this paper is to investigate into the influence of boundary condition of impact tests and diameters of impact head on low-velocity impact characteristics of SUS304 sheet. Several drop impact tests have been performed. Through the results of the experiments, the characteristics of the deformation, the energy absorption and the failure for the SUS304 sheet have been quantitatively examined. From the results of the experiments, it has been shown that the absorption mechanism of the impact energy is changed from the depression of the impact area to the mixed mode with the depression of the impact area and a successive wrinkle in the center line. In addition, it has been shown that the maximum absorption energy and the rate of energy absorption for drawing type impact tests increases with increasing diameters of the impact head, whereas that for stretching type impact tests maintains almost the same value irrespective of diameters of the impact head.