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원자로 용기의 가압열충격에 대한 파괴역학 해석 - 탄소성 거동과 클래드부의 영향 -
주재황,강기주,정명조,Ju, Jae-Hwang,Gang, Gi-Ju,Jeong, Myeong-Jo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.1
Performed here is an assessment study for deterministic fracture mechanics analysis of a pressurized thermal shock(PTS). The PTS event means an event or transient in pressurized water reactors(PWRs) causing severe overcooling(thermal shock) concurrent with or followed by significant pressure in the reactor vessel. The problems consisting of two transients and 10 cracks are solved and maximum stress intensity factors and maximum allowable nil-ductility reference temperatures are calculated. Their results are compared each other to address the general characteristics between transients, crack types and analysis methods. The effects of elastic-plastic material behavior and clad coating on the inner surface are explored.
부분충진된 WBK 트러스 다공질 금속의 압축 특성 평가
주재황(Jai-Hwang Joo),박종선(Jong-Sun Park),강기주(Ki-Ju Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Lightweight cellular metals combining load supporting capability and thermal management characteristics are required for multifunctional applications. Recently, a new technique for fabricating cellular metal, known as Wire-woven Bulk Kagome (WBK), has been introduced, which is used for fabricating multilayered Kagome truss-type cellular metal. The WBK is composed of helically formed wires and it has been proved that it has high strength-per-weight. In this work, a partially filled WBK with very high specific strength was devised to suppress the elastic buckling of struts which is a typical failure mechanism of truss type PCM (periodic cellular metals). First, theoretical studies using elementary mechanics of material are presented to estimate the strength under out-of-plane compression. And the results are compared with those measured by experiments which were performed with specimens with various slenderness ratios of struts. It has been found that the partially filled WBK exhibited high specific stiffness and strength, absorption of energy in comparison with ordinary WBK.
3차원 탄소성 유한요소법을 이용한 SiC 휘스커강화 AI복합재와 ZrO₂접합체의 잔류응력해석
주재황(J.H.JOO),박명균(M.K.PARK),박세만(S.M.BAHK) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Employing a three dimensional finite element method a thermal elasto-plastic stress analysis was conducted to investigate residual stress distributions on the joining area between a ceramic(ZrO₂) and a SiC whisker-reinforced aluminum (AI composite). For purposes of comparisons, residual stresses at the interfaces on the joining area were first analyzed for<br/> varying volume fractions of SiC whiskers utilizing two dimensional elasto-plastic models. The<br/> results from the 2-D models were compared with those from 3-D models to understand the practical nature of residual stresses produced during industrial joining procssses for ceramics and metal matrix composites. Additionally, the same procedures were applied to compute stress variations along a line passing through the joining area to obtain a physical insight and to offer a plausible explanations for fracture patterns occuring at the interfaces during bending.<br/>
확장금속망 공정으로 제작된 옥테트 트러스 다공질 금속 (Ⅰ)
주재황(Jai-Hwang Joo),이동석(Dong-Seok Lee),전인수(Insu Jeon),강기주(Ki-Ju Kang) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.11
This paper presents a new way for fabricating sandwich plates with tetrahedral truss cores. The tetrahedral truss cores are manufactured through metal expanding and bending process and then brazed with solid face sheets. The properties of sandwich plates with the tetrahedral truss cores composed of a wrought steel SS41 under compression and shear loading have been investigated. Good agreement is observed between the measured and predicted peak strengths. Comparisons with normalized compressive strength for other cellular metals have indicated that the tetrahedral truss structures outperform aluminum open cell forms and woven core sandwich plates.
탄소성해석을 통한 SiC whisker 강화 Al 복합재와 ZrO₂접합체의 잔류응력해석
주재황(J.H.JOO),백범선(B.S.BAEK),박명균(M.K.PARK),박세만(S.M.BAHK) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
A two dimensional thermo elasto-plastic finite element stress analysis was performed to study residual stress distributions in AL composite reinforced by SiC whisker and ZrO₂ ceramic joints. The influences on the residual stress distributions due to the difference of the reinforcement volume fraction and interlayer material property were investigated. Specifically, stress distributions between Al interlayer and ZrO₂ ceramic and between the Al interlayer and Al composite were computationally analyzed.<br/>
알루미늄 나선형 와이어로 직조된 다층 Kagome Truss PCM의 유동 및 열전달 특성에 관한 연구
주재황(Jai-Hwang Joo),강보선(Bo-Seon Kang),강기주(Ki-Ju Kang) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.1
Recently, ultra-lightweight materials with open, periodic cell structures take much attention owing to its potential for multi-functionality such as load bearing, thermal dissipation, and actuation. This paper presents experimental results on the fluid flow and heat transfer characteristics for the Wire-woven Bulk Kagome (WBK) composed of aluminum 1100 wires. The overall pressure drop and heat transfer of the WBK specimen was experimentally investigated under forced air convection condition. The pressure loss and heat transfer performance of the aluminum WBK were compared with other heat dissipation media. It was shown that heat transfer characteristics depended on relative density and surface area density. Comparison with metal foams and other heat dissipation media such as packed beds, lattice frame materials, louvered fins, and others suggests that the aluminum WBK competes favorably with the best available heat dissipation media in heat transfer performance.
Al₂O₃/低膨脹合金의 接合强度와 應力特異性에 關한 硏究
주재황(J. H. JOO),최영택(Y. T. CHOI),박명균(M. K. PARK),박세만(S. M. PARK),최승규(S. G. CHOI) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this research, both computational and experimental studies are conducted to reveal mechanical natures of bondings and consequences of joining processes for metals and ceramic pairs. In the computational part of this research a FEM analysis was utilized to effectively evaluate stress fields around ceramic-metal interfaces. Special attentions were paid to consider the low yield strength of interlayer alloys(buffer alloys). For the experimental part the effectiveness of active brazing metal methods was investigated. For the test. four different types of ceramic-metal pairs are fabricated. All the ceramic-metal pairs are brazed in vacuum at 850℃, 900℃ and 950℃. Tensile tests were conducted on the fabricated ceramic-metal pairs to evaluate bond strength between ceramics and metals. The test results show temperature effects and increases in bond strengths which is largely due to the inserted buffer layers(Mo-Mn and Ni Layer).
3차원 탄소성 유한요소법을 통한 금속복합재료와 지르코니아 접합체의 잔류응력해석
주재황,선동주,최영택,박세만,박명균 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
Employing a three dimensional finite element method a thermal elasto-plastic stress analysis was conducted to investigate residual stress distributions on the joining area between a ceramic(ZrO₂) and a SiC whisker-reinforced aluminum (Al composite). For purposes of comparisons, residual stresses at the interfaces on the joining area were first analyzed for varying volume fractions of SiC whiskers utilizing two dimensional elasto-plastic models. The results from the 2-D models were compared with those from 3-D models to understand the Practical nature of residual stresses produced during industrial joining processes for ceramics and metal matrix composites. Additionally, the same procedures were applied to compute stress variations along a line passing through the joining area to obtain a physical insight and to offer a plausible explanations for fracture patterns occuring at the interfaces during bending.
탄성해석을 통한 구조용 세라믹/금속접합체의 잔류응력해석
정재진,박세만,박명균,주재황 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
A two dimensional finite element analysis was performed to study residual stress distributions in ceramic/metal joints with a copper interlayer between the ceramic and the metal Residual stress distributions due to differences in material properties were investigated by varying material parameters. Specifica11y, stress distributions between the copper layer and ceramics, and between the copper layer and metals were computationaly analyzed A thermoelastic finite element analysis was conducted to determine effects of interlayer properties on residual stress distributions. Based on the results of current analysis, recommendations were made to decrease the residual stresses in ceramic/metal joints.