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가변 절점 요소를 이용한 접착 조인트의 유한 요소 해석
추연석(Choo Yeon Seok),이병채(Lee Byung Chai) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Stress singularity exists at the interface comers in adhesive joint that is bonded by dissimilar materials. Although relatively coarse mesh is sufficient for overall adhesive joint structure, it is necessary to apply very refined mesh at the comers for exact calculation of stress distribution. This increases the cost and time to accomplish the finite element analysis of adhesive joint. In this paper, we proposed the modeling method with variable nodes element that is an n-sided polygonal shape element. This method helps to easily model the comers with less elements and reduces the cost and time. The results are also very good compared to those of conventional refined modeling method. A hybrid Treffiz formulation and boundary integration scheme are used to construct variable nodes element.
신규 개발 저출력 연구용 원자로 구조물 집합체의 동특성 해석
추연석(Yeon Seok Choo),김경호(Gyeongho Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A new concept of a low power research reactor (LPRR) has been proposed by KAERI (Korea Atomic Energy Research Institute), which is composed of a core support structure, a core box, core components with fuel assemblies, and four control rod drive mechanisms. In this study, dynamic characteristics of the reactor structure assembly submerged in the reactor pool are investigated using finite element method. As a result of modal analysis, it is found that the reactor structure assembly can be considered rigid against the external excitations. The reactor structure assembly has no resonances in the frequency range below the cutoff frequency of the typical floor response spectrum (FRS).
이민정(Lee Min-Jeong),추연석(Choo Yeon-Seok),조태민(Cho Tae-Min),오현철(Oh Hyeon-Cheol),이병채(Lee Byung-Chai) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study, experiment and finite element analysis were studied about single lap joints using RTV88. At first, tensile test was conducted to obtain material properties of RTV88. From this test, it was proven that RTV88 is an elastomeric material and it can be modeled using Hyperfoam material model in ABAQUS. Then shear test was performed to obtain failure load and shear strength of RTV88. Finite element analysis was applied to single lap joint to analyze stress state. Finally, some physical quantities were studied as failure criteria.