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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/>
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 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/>
백범선(B.S.BAEK),주재황(J.H.JOO),박명균(M.K.PARK),박세만(S.M.BAHK) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
A conventional photoelasticity method has some difficulties to get the accurate results due to a collapsed image of the fringe when performing stress analysis around a crack tip or concentrated loading point. A method of digital image processing technique, which can multiply and sharpen the isochromatic fringe in photoelasticity is applied to obtain a better photoelastic fringe pattern of a v-notch plate under tension.<br/>
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.