http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임재문,강승구,신광복,이상우 한국복합재료학회 2017 Composites research Vol.30 No.6
In this paper, evaluation method of structural integrity of cylindrical composite lattice structures was conducted. A finite element analysis was used to evaluate the structural integrity of composite lattice structures. In order to verify the optimal finite element in the evaluation of the structural integrity, finite element models for cylindrical composite lattice structure were generated using beam, shell and solid elements. The results of the finite element analyses with the shell and solid element models showed a good agreement. However, considerable differences were found between the beam element model and the shell and solid models. This occurred because the beam element does not take into account the degradation of the mechanical properties of the non-intersection parts of cylindrical composite lattice structures. It was found that the finite element analysis of evaluation of structural integrity for cylindrical composite lattice structures have to use solid element. 본 논문에서는 원통형 복합재 격자구조체의 구조안전성 평가 기법에 대해 연구를 수행하였다. 구조안전성 평가는 유한요소해석을 통해 수행하였다. 구조안전성 평가를 위한 최적의 유한요소를 확인하기 위해 원통형복합재 격자구조체 유한요소모델은 빔, 쉘 그리고 솔리드 요소를 사용해 생성하였다. 쉘과 솔리드 모델의 유한요소 해석결과는 서로 유사하게 발생되었다. 그러나 빔 모델의 경우, 쉘과 솔리드 모델의 결과와 큰 차이가 발생하였다. 이것은 빔 요소가 원통형 복합재 격자구조체 섬유 비교차부의 기계적 물성저하를 고려하지 못하기 때문이다. 원통형 복합재 격자구조체의 구조안전성 평가를 위한 유한요소해석은 쉘 또는 솔리드 요소를 사용해야 하는 것을 확인하였다.
탄소섬유 복합재 격자구조체를 적용한 자기부상열차의 경량화 설계 및 구조안전성 평가
이상우,안효훈,신광복 한국철도학회 2022 한국철도학회논문집 Vol.25 No.8
This study investigated a measure for reducing the car body weight of high-speed maglev trains by replacing the conventional car body structure, comprising extruded aluminum panels, with composite lattice structures. The adopted cap frame, underframe, and side frame of the high-speed maglev train model comprised extruded aluminum panels; the roof of this model was composed of a sandwich composite. Owing to the sandwich composite, the weight of this car body was 15% lower than that of conventional car bodies comprising extruded aluminum panels. This weight reduction effect was maximized by applying composite lattice structures for additional weight reduction. Design variables were established for using composite lattice structures and structural integrity was evaluated through structural analyses. To evaluate the structural integrity of the body, during a performance test on urban trains, constraints and load conditions were assigned depending on the evaluation parameters for maglev trains. Results confirmed an additional reduction of 5% in car body weight. Applying these carbon fiber composite lattice structures across the entire car body should afford a weight reduction of 40%.
육각 격자구조를 갖는 콘형 복합재 격자구조체의 구조안전성 평가 기법 연구
임재문 ( Jae-moon Im ),강승구 ( Seung-gu Kang ),신광복 ( Kwang-bok Shin ),이상우 ( Sang-woo Lee ) 한국복합재료학회 2018 Composites research Vol.31 No.4
본 논문에서는 콘형 복합재 격자구조체의 구조안전성 평가 기법에 대해 연구를 수행하였다. 콘형 복합재격자구조체의 구조안전성 평가는 유한요소해석을 통해 수행되었다. 구조안전성 평가를 위한 유한요소모델은 솔리드 요소를 사용하여 생성하였다. 섬유 교차부와 비교차부의 물성 차이를 고려하기 위해 섬유 체적률을 고려한 기계적 물성을 적용하였다. 구조해석 기법의 검증을 위해 콘형 복합재 격자구조체의 압축 시험을 수행하였다. 시험과 해석의 비교 결과, 약 2%의 변위 오차가 발생하여 잘 일치하는 것을 확인하였다. In this paper, evaluation method of structural integrity for cone-type composite lattice structures with hexagonal cell was conducted. A finite element analysis was used to evaluate the structural integrity of cone-type composite lattice structure. The finite element model for evaluation of structural integrity was generated using solid element. In order to consider the difference in mechanical properties between intersection and non-intersection part, the mechanical properties were applied considering the fiber volume fraction of each part. Compression test of conetype composite lattice structure were conducted for verification of evaluation method of structural integrity. The analysis result showed 2% errors in displacement and good agreement with test result.
콘형 복합재 격자구조체의 설계 변수에 따른 구조 안전성 해석
김동건(DONGGEON KIM),도영대(YOUNGDAE DOH),김근상(GENSANG KIM),손조화(JOWHA SON),이상우(SANGWOO LEE) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.11
복합재 격자구조체는 요구 하중을 최소한의 무게 및 두께로 지지하는 구조체로, 고강도 탄소섬유에 에폭시 수지를 함침시켜 필라멘트 와인딩 공법으로 제작된다. 구조적으로 반드시 필요한 부위만을 적층 및 제작하여 경량화를 극대화 할 수 있는 복합재 격자구조체는 항공기, 위성발사체, 유도무기 등에 적용할 수 있다. 본 논문에서는 180ton의 압축 요구하중을 만족하는 콘형 격자구조체를 설계하여 기준모델로 선정한 후, 헬리컬 리브의 두께, 폭 및 후프 리브의 개수를 설계 변수로 3가지 형상의 콘형 격자구조체를 추가적으로 설계하였다. 이후 ABAQUS/CAE를 사용하여 구조해석을 수행하였으며, 설계 변수에 따른 콘형 격자구조체의 압축 및 좌굴하중의 경향성을 분석하였다. Composite lattice structure that supports the required load with a minimum weight and thickness is manufactured by a filament winding using impregnated high-strength carbon fiber with epoxy resin. Composite lattice structures that can maximize weight reduction by manufacturing only structurally essential parts can be applied to aircraft, satellite launch vehicles, and guided weapons. In this paper, a cone-shape lattice structure that satisfies the required compression load of 180 tons was designed and selected as a reference model. And then three shapes of lattice structures were designed with the design parameters of the thickness, width of the helical rib and number of hoop ribs. Structural analysis was performed using ABAQUS/CAE, and the tendency of compression and buckling loads of the cone-shaped lattice structure according to the design variables was analyzed.
섬유체적비 불균일 및 수지응집층이 복합재 격자 구조체 리브의 강성도 거동에 미치는 영향
강민송 ( Min-song Kang ),전민혁 ( Min-hyeok Jeon ),김인걸 ( In-gul Kim ),김문국 ( Mun-guk Kim ),고은수 ( Eun-su Go ),이상우 ( Sang-woo Lee ) 한국복합재료학회 2018 Composites research Vol.31 No.4
원통형 복합재 격자 구조체는 필라멘트 와인딩 기법으로 제작되며 제작 공정에서 발생할 수 있는 섬유체적비 불균일과 수지응집층은 구조체의 강성도 및 강도에 영향을 줄 수 있다. 구조체의 주요 요소인 후프 및 헬리컬 리브의 단면 분석을 통해 섬유체적비 불균일 및 수지응집층의 존재 여부를 확인하였으며, 단면 분석 결과를 바탕으로 후프 및 헬리컬 리브에 대한 실험 및 이론적 접근을 통해 섬유체적비 불균일 및 수지응집층이 리브 요소의 강성도에 미치는 영향을 분석하였다. 섬유체적비 불균일이 후프 리브의 굽힘 거동에 영향을 미치는 것을 확인하였으며 헬리컬 리브의 경우 섬유체적비 불균일 및 수지응집층에 의해 강성도에 변화가 있음을 확인하였다. Cylindrical composite lattice structures are manufactured by filament winding process. The fiber volume fraction non-uniformity and resin rich layers that can occur in the manufacturing process affect the stiffness and strength of the structure. Through the cross-section examination of the hoop and helical ribs, which are major elements of the composite lattice structure, we observed the fiber volume fraction non-uniformity and resin rich layers. Based on the results of the cross-section examination, the stiffness of the ribs was analyzed through the experimental and theoretical approaches. The results show that the fiber volume fraction non-uniformity and resin rich layers have an obvious influence on the rib stiffness of composite lattice structure.
김동건(Donggeon Kim),도영대(Youngdae Doh),김근상(Gensang Kim),이상우(Sangwoo Lee),김명주(Myungjoo Kim) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.6
The composite lattice structure is a structure that supports the required load with the minimum weight and thickness. Composite lattice structure is manufactured by the filament winding process using impregnating high-strength carbon fiber with an epoxy resin. Filament winding process can laminate and manufacture only structurally necessary parts, composite lattice structure can be applied to aircraft fuselages, satellite and launch vehicles, and guided weapons to maximize weight reduction. In this paper, the development and evaluation of the composite lattice structure corresponding to the entire process from design, analysis, fabrication, and evaluation of large-scale cylindrical and conical composites lattice structure were performed. To be applicable to actual projectiles and guided weapons, we developed a cylindrical lattice structure with a diameter of 2,600 mm and a length of 2,000 mm, and a conical lattice structure with an upper diameter of 1,300 mm, a lower diameter of 2,500 mm, and a length of 900 mm. The performance of the developed composite lattice structure was evaluated through a load test.
복합재 격자구조체를 적용한 하이퍼튜브 차체 구조 설계 제시 연구
한관희,안효훈,김정석,이창영,신광복 한국철도학회 2023 한국철도학회논문집 Vol.26 No.11
This paper describes study on structure design for a Hypertube carbody made of composite lattice structurebased on carbon fiber. The three-structure design proposed in this study involves a carbody with aircraft entrance doors that prioritized structural performance, a carbody with gullwing doors that considered passenger convenience and weight reduc-tion, and a carbody with reinforced structural rigidity of gullwing doors; we evaluated the structural integrity through finite element analysis according to the standards for urban railway vehicles. In structural analysis, the influence of internal pres-sure conditions on the vehicle in operation was assessed, in addition to the load conditions specified by the standards. The results of the structural analysis show that the two carbody designs with gullwing-type doors do not meet urban railway vehicle standards, but the carbody equipped with aircraft doors satisfies all standard requirements.