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강구조용접연결부(鋼構造鎔接連結部)의 내부구열성장(內部龜裂成長)에 관한 실험적(實驗的) 연구(硏究)
민창동,김기두,장동일,Min, Chang Dong,Kim, Ki Du,Chang, Dong Il 대한토목학회 1985 대한토목학회논문집 Vol.5 No.2
SWS-58 강재(鋼材)와 HT-80 강재(鋼材)를 모재(母材)로 한 등질(等質) 또는 연질용접연결(軟質鎔接連結)의 피로구열성특성(疲勞龜裂成特性)을 파면해석(破面解析)을 통(通)하여 검토(檢討)하여 표면(表面)에서 관측(觀測), 측정(測定)하는 피로구열성특성(疲勞龜裂成特性)의 공학적(工學的)인 응용성(應用性)이 높은 것을 탐지하였다. 또한 HT-80 강재(鋼材)의 용접부(鎔接部)는 포성파괴(胞性破壞)의 위험성(危險性)이 높은 것을 밝혔다. SWS-58 강재(鋼材)의 용접부(鎔接部)에는 줄무늬 모양이 발견되며, 줄무늬 간격은 da/dN 보다 높은 값을 표시(表示)하는데 이것으로 내부피로구열(內部疲勞龜裂)이 지그재그 방향(方向)으로 성장(成長)하는 것을 알 수가 있었다. The characteristic of fatigue crack growth in the homogeneous or the soft welded connections used SWS-53 steel and HT-80 steel as base metals is examined by fractographic analysis. As a result of this analysis, the fact that the characteristic of fatigue crack growth which is observed and measured at the surface has wide application to engineering practice is verified. Also, the fact that the welded parts of HT-80 steel have much danger of brittle fracture is prooved. Considering that the striations are observed at the welded parts of SWS-58 steel and the spacing of striations has higher numerical value than da/dN, we can prove that inner fatigue crack growth may develop in zig-zag directions.
용접강교량(鎔接鋼橋梁) 부재(部材)의 충격(衝擊) 및 피로파괴거동(疲勞破壞擧動)에 관한 연구(硏究)
장동일,민창동,용환선,Chang, Dong Il,Min, Chang Dong,Yong, Hwan Sun 대한토목학회 1985 대한토목학회논문집 Vol.5 No.4
국내강교량(國內鋼橋梁)에서 사용(使用)되는 대표적인 강종(鋼種)인 SWS50에 대한 파괴거동(破壞擧動)의 거시적(巨視的)인 고찰(考察)을 통하여 충격파괴거동(衝擊破壞擧動)과 피로거동(疲勞擧動)을 조사(調査)하여 미시적(微視的)인 고찰(考察)과의 관계(關孫)를 추적하는데 필요(必要)한 기초자료(基礎資料)의 제시와 국내(國內) 생산(生?)시판 강종(鋼種)에 대한 파괴제어(破壞制御)의 자료(資料)를 제공한다. In this study, impact fracture and Fatigue behaviors of SWS50 steel are investigated in terms of macroscopic view. Then the fundamental data needed to trace the relationship between macroscopic and microscopic views and the data for fracture control of steels manufactured in domestic are represented.
적층 복합판의 보강방향 및 형상비 변화에 따른 임계좌굴하중
심도식(Do Sik Sim),김경진(Kyeong Jin Kim),민창동(Chang Dong Min),박제선(Je Seon Park) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
In this paper, simple formulas to obtain $quot;accurate$quot; values of the critical buckling load of certain type laminate are compared with Whitney`s equations. Also critical buckling loads of plates with varying aspect ratios and fiber orientations, are compared with critical buckling load of a beam. Even though this paper is limited to the composite laminated plates of [α/β/β/γ/α/α/β]r type, the critical buckling loads of such plates with various fiber orientations, ply numbers and plate aspect ratios, can be used by engineers for a preliminary design. This work can be a guideline to obtain data in many other cases.
閔彰東 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.2
When we design a bridge if we use the desing live load indicated in specifcation, it is considered to be in safety side. However, the large sized and high speeded vehicles have caused over-vibration of a bridge and the changing compass of its stress wave leaves a big problem. In this paper, the writer developed the theory of vibration based on general elastic assumption to the vibration behavior of a bridge, and tried to seek not only vibration behavior with frequency of vehicle and the change of speed by using Ragrange's equation of motion but also dynamic response by using matrix structural analysis.
閔彰東 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2
When the load acts dynamically, the deflection, the bending moment and the shearing force increase more than it acts statically. Accordingly the effect of dynamic load in design is considered by the mothod of progressive impact factor. However, it is hard to examine closely the exact valadity of that method. We developed the theory of vibration on the basis of general elasticity assumption to the vibration behavior of simple steel bridge, and calculated the deflection and the section force of each point of the beam in dynamic ioad acting on the middle of the beam. We compard these values with those from the method of progressive impact factor and those of survey to make clear the valadity of the method of progressive impact factor.
積層複合板의 積層Parameter와 剛性에 관한 數値的 硏究
閔彰東,金敬鎭,成基泰 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2
The material design of fibrous composite materials are composed by the design on mechanical properties of elemental specimen and structural members. The mechanical properties mean the elastic modulus, stiffness and strength. These are almost completed about various topics under the condition of static load. Methods for designing laminated composites which have required in-plane and/or flexural stiffness are studied in this paper. The characteristics of the parameters which were first introduced by Tasi and Hahn as geometric factors to evaluate the stiffness of composites and are referred to as laminated parameters are examined. It is shown that these parameters can play on important role in material design problem as well. The numerical results are compared with the previous obtained ones. Consequently, the useful informations that are orthotropic on quasi-isotropic types were obtained on the lamination parameter and the stiffness of symmetric laminated plates.
閔彰東 忠州大學校 1968 한국교통대학교 논문집 Vol.2 No.-
A Suspension bridge is an economical bridge which is constructed in case of the long span. Theoretic ally the author tried to determine the shape of cable, the stress, the deformation, which are the main members of this bridge ; and then in three hinge high-strength reinforce truss, one of the suspenison bridge styles, the author described to determine at what point the moment and shearing force reach the maximum, when the load act on the bridge.