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이제준(Je-Jun Lee),이영신(Young-Shin Lee),김재훈(Jae-Hoon Kim),이정희(Jung-Hee Lee),구송회(Song-hoe Koo),문순일(Soon-Il Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In this paper, the fracture simulation of ceramic dome under shock pressure is performed by the finite element method with nonlinear code LS-Dyna. The material properties of simulation are applied with experimental result of tensile test for MACOR Glass-filled ceramic. The simulation is carried out with 3 type dome models under various impact pulse shape. The fracture strength and pressure are compared about each case. The results of the simulation are useful to evaluate the behavior of ceramic dome.
이제준(Je-Jun Lee),이영신(Young-Shin Lee),김재훈(Jae-Hoon Kim),변성우(Seong-Woo Byun),김현수(Hyun-Soo Kim),구송회(Song-hoe Koo),문순일(Soon-Il Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The combustor, diffuser and nozzle are main components of the ramjet engine. The objective of this study is thermo structure analysis of the combustor. The combustor is composed of 17-4 PH stainless steel housing and Inconel 718 liner. Temperature conditions of housing and liner are quite different. The combustor liner is rapidly heated up to 700℃, so that is reached plastic zone locally. The temperature of combustor housing rises to 400℃. The thermal stress of liner is large than housing stress. The nonlinear thermal analysis with mechanical properties of both housing steel and liner inconel such as Young’s modulus, thermal expansion coefficient and thermal conductivity is conducted. The analysis of the transient temperature and thermal stress of combustor is carried out the finite element method with code Nastran. The structural assessment of combustor is evaluated.
저속 충격시 보강 형태에 따른 원통쉘의 충격 특성 연구
이제준(Je-Jun Lee),강윤기(Yun-Ki Kang),이영신(Young-Shin Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Cylindrical shell structure is frequently used in the aerospace, ship and ether engineering structures. The stiffener is used in order to increase of strength of the shell structure. The object of this parer is the investigation of the impact characteristics of the stiffened cylindrical shell under low-velocity impact using various stiffener shares. The stringer, ring and orthogonal stiffener are design variables of the stiffened cylindrical shell, The ABAQUS/Explicit version 6.4 is used for the finite element analysis. Finally, we suggest the optimized stiffener shape which has highest strength to low-velocity impact.
이은엽(Eun-Yup Lee),이영신(Young-Shin Lee),최영진(Young-Jin Choi),이제준(Je-Jun Lee),박영문(Young-Moon Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study, the safety of the rack structure was evaluated through seismic analysis considering fluid-structure interaction. The rack structure was sunk under water. So, rack structure was influenced by water. The fluid-structure interaction can be specified in terms of hydrodynamic effect which is defined as added mass per unit length in ANSYS 10.0. Modal analysis and seismic analysis using the Floor Response Spectrum(FRS) was carried out under Operating Basis Earthquake(OBE) and Safe Shutdown Earthquake(SSE) conditions. The fluid-structure interaction effect and safety of rack structure were investigated using ANSYS10.0.
침수후 시간에 따른 교정용 레진접착제의 전단결합강도 변화
이제준,김종철 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.5
본 연구는 침수후 시간경과에 따른 레진접착제의 전단결합강도 변화를 비교연구하고 파절양상을 평가하기 위하여 시행되었다. 건전한 제1소구치를 포매하여 만든 시편에 화학중합형 레진접착제인 Concise 와 광중합형 레진접착제인 Transbond 를 이용하여 금속 브라켓을 부착하고 37℃ 증류수에 1일, 1주일, 1개월, 3개월, 6개월 동안 침수시킨 후 전단결합강도를 측정하고 파절양상을 관찰하여 다음과 같은 결론을 얻었다. 1. 침수시간에 따른 전단결합강도 비교시 Concise군과 Transbond군 모두에서 6개월의 결합강도가 1일, 1주일, 1개월에 비해 유의성있에 높았으며(P<0.05) 상관검정 결과 침수시간이 증가할수록 전단결합강도가 증가하는 것으로 나타났다(P<0.01). 2. Concise군과 Transbond군간의 전단결합강도 비교에서는 유의한 차이가 없었다. 3. 접착제 잔류지수를 통하여 파절양상을 비교 관찰한 결과 브라켓 기저부와 접착제 경계부에서의 탈락이 가장 많았으며 침수시간에 따른 접착제 잔류지수간에 유의한 차이는 없었다. The purpose of this study was to evaluate the changes of shear bond strengths and failure patterns in orthodonic resin adhesives according to the water immersion time. Metal brackets were bonded to the specimens involving the premolars with chemical-cured(Concise ) and light-cured(Transbond ) adhesives. The shear bond strength was measured on universal testing machine and the failure patterns were assessed with the adhesive remnant index(ARI) after storage in distilled water at 37℃ for 1 day, 1 week and 1, 3, and 6 months, respectively. The results were as follows : 1. The shear bond strengths at the 6month in both Concise and Transbond were significantly higher than those at the 1 day, 1 week 1 month(P<0.05). There were positive correlations between shear bond strength and water immersion time in both Concise and Transbond(P<0.01). 2. There were no significant differences in shear bond strength between Concise and Transbond. 3. The brackets were failed primarily at the bracket base-adhesive interface and there was no significant difference in the incidence of ARI scores according to the water immersion time.
침수후 시간에 따른 교정용 레진접착제의 전단결합강도 변화
이제준,김종철 전남대학교 치과대학 1998 전남치대논문집 Vol.10 No.1
The purpose of this study was to evaluate the changes of shear bond strengths and failure patterns in orthodontic resin adhesives according to the water immersion time. Metal brackets were bonded to the specimens involving the premolars with chemical-cured(Concise??) and light-cured(Transbond??) adhesives. The shear bond strength was measured on universal testing machine and the failure patterns were assessed with the adhesive remnant index(ARI) after storage in distilled water at 37℃ for 1 day, 1 week and 1, 3, and 6 months, respectively. The results were as follows : 1. The shear bond strengths at the 6 month in both Concise and Transbond were significantly higher than those at the 1 day and 1 week(P<0.05). There were positive correlations between shear bond strength and water immersion time in both Concise and Transbond(P<0.01). 2. There were no significant differences in shear bond strength between Concise and Transbond. 3. The brackets were failed primarily at the bracket base-adhesive interface and there was no significant difference in the incidence of ARI scores according to the water immersion time.