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유한요소해석을 이용한 평면 응력을 받는 완전 고정된 판의 좌굴 판단 기준에 대한 연구
이오성(Ohseong Lee),이건민(Keonmin Lee),윤정노(Jeongroh Yoon),유구현(Guhyun Ryu) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Buckling is undesirable phenomenon in designing mechanical elements. In particular, thin plate has low resistance about buckling due to its geometrical shape. Therefore, engineers have to be carful during the design proccess. Many preceding research derived buckling theories for various boundary conditions, but the solution of buckling mode is not a finite sum and is complicate to applicate in practical cases. Also, since the mathmetical solution of fully clamped rectangular plate is much more complicate than simply supported plate, the need for intuitively usable criteria emerges. Therefore, this study aims to suggest a criterion for clamped plate buckling by using finite element analysis method. From the results of iterative simulations, a criterion with simple straight lines was derived. This criterion does not strictly follow the curve from iterations, but since the derived criterion is simple and easy to applicate, it is worth enough for designing a thin plate.
유한요소해석을 이용한 평면 응력을 받는 완전 고정된 판의 좌굴 판단 기준에 대한 연구
이오성(Ohseong Lee),이건민(Keonmin Lee),윤정노(Jeongroh Yoon),유구현(Guhyun Ryu) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Buckling is undesirable phenomenon in designing mechanical elements. In particular, thin plate has low resistance about buckling due to its geometrical shape. Therefore, engineers have to be carful during the design proccess. Many preceding research derived buckling theories for various boundary conditions, but the solution of buckling mode is not a finite sum and is complicate to applicate in practical cases. Also, since the mathmetical solution of fully clamped rectangular plate is much more complicate than simply supported plate, the need for intuitively usable criteria emerges. Therefore, this study aims to suggest a criterion for clamped plate buckling by using finite element analysis method. From the results of iterative simulations, a criterion with simple straight lines was derived. This criterion does not strictly follow the curve from iterations, but since the derived criterion is simple and easy to applicate, it is worth enough for designing a thin plate.
축소 모델을 활용한 통합마스트의 구조건전성 검증 방안 연구
이종학(Jong-Hak Lee),손동훈(Donghoon Son),이건민(Keonmin Lee),김동준(Dongjoon Kim),박상원(Sangwon Park),박노철(No-Cheol Park) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.2
Integrated masts, equipped with radars and other sensors, reduce radar cross sections and improve destroyers’ stealth ability. Because of their critical impact on ships’ survivability, they have to undergo vibration tests to ensure their structural integrity. However, testing of gigantic shipboard equipment is difficult, time-consuming, and costly. Therefore, countries without the facilities required to test large structures omit the test or circumvent it by substituting finite element analysis. In this study, we propose a method to experimentally test the structural integrity of masts through scaled models based on similitude analysis. We constructed full-scale and 1/10-scale 3D finite element models to compare their dynamic characteristics and responses. From the finite element analysis, we found that the dynamic responses of the full-scale model can be derived from the responses of the downscaled model through the application of scaling factors defined by dimensional analysis. Our results suggest that downscaled models can supplant full-scale models in vibration experiments. We anticipate our research to be a starting point for more efficient, economic, and feasible experimental testing.