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문성인(Seong-In Moon),장윤석(Yoon-Suk Chang),김영진(Young-Jin Kim),이진호(Jin-Ho Lee),송명호(Myung-Ho Song),최영환(Young-Hwan Choi),황성식(Seong-Sik Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
The 40% of wall thickness criterion, which is generally used for the plugging of steam generator tubes, is applied only to a single crack. In the previous study, a total number of 10 local failure prediction models were introduced to estimate the coalescence load of two collinear through-wall cracks and the reaction force model and plastic zone contact model were selected as optimum ones. The objective of this study is to estimate the coalescence load of two collinear through-wall cracks in steam generator tube by using the optimum local failure prediction models. In order to investigate the applicability of the optimum local failure prediction models, a series of plastic collapse tests and corresponding finite element analyses for two collinear through-wall cracks in steam generator tube were carried out. Thereby, the applicability of the optimum local failure prediction models was verified and finally a coalescence evaluation diagram which can be used to determine whether the adjacent cracks detected by NDE coalesce or not was developed.
리튬이온폴리머전지용 가교형 겔폴리머전해질의 중합조건 최적화 연구
김현수,문성인,김상필,Kim, Hyun-Soo,Moon, Seong-In,Kim, Sang-Pil 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.1
In this work, polymerization conditions of the gel polymer electrolyte (GPE) were studied to obtain better electrochemical performances in a lithium-ion polymer battery. When the polymerization temperature and time of the GPE were 70$^{\circ}C$ and 70 min, respectively, the lithium polymer battery showed excellent a rate capability and cycleability. The TMPETA (trimethylolpropane ethoxylate triacrylate)/TEGDMA (triethylene glycol dimethacrylate)-based cells prepared under optimized polymerization conditions showed excellent rate capability and low-temperature performances: The discharge capacity of cells at 2 Crate showed 92.1 % against 0.2C rate. The cell at -20 $^{\circ}C$ also delivered 82.4 % of the discharge capacity at room temperature.
Hybrid Capacitor의 전기화학적 특성 및 Hybrid Capacitor / Li-ion Battery의 펄스 방전 특성
이선영,김익준,문성인,김현수,Lee, Sun-Young,Kim, Ick-Jun,Moon, Seong-In,Kim, Hyun-Soo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.12
In this study, we have prepared, as the pluse power source, a commercially supplied Li-ion battery with a capacity of 700 mAh and AC resistivity of 60 md at 1 kHz and nonaqeous asymmetric hybrid capacitor composed of an activated carbon cathode and MCMB anode, and have examined the electrochemical characteristics of hybrid capacitor and the pulse performances of parallel connected hybrid capacitor/Li-ion battery source. The nonaqueous asymmetric hybrid capacitors constituted with each stack number of pairs composed of the cathode, the porous separator and the anode electrode were housed in Al-laminated film cell. The 10 stacked hybrid capacitor, which was charged and discharged at a constant current at 0.25 $mA/cm^2$ between 3 and 4.3 V, has exhibited the capacitance of 108F and the lowest equivalent series resistance was 32 $m{\Omega}$ at 1 kHz. On the other hand, the enhanced run time of Li-ion battery assisted by the hybrid capacitor was obtained with increasing of current density and pulse width in Pulse mode. The best improvement, $84\;\%$ for hybrid capacitor/Li-ion battery was obtained in the condition of a 7C-rate pulse (100 msec)/0.5C-rate standby/$10\;\%$ duty cycle.
Polyoxyalkylene Glycol Acrylate기 Gel Polymer Electrolyte를 적용한 리튬이온폴리머전지의 전기화학적 특성
김현수,김성일,나성환,문성인,Kim, Hyun-Soo,Kim, Sung-Il,Na, Seong-Hwan,Moon, Seong-In 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.2
In this work, a gel polymer electrolyte (GPE) was prepared using polyoxyalkylene glycol acrylate (POAGA) as a macromonomer LiCoO$_2$/GPE/graphite cells were prepared and their electrochemical properties were evaluated at various current densities and temperatures. The ionic conductivity of the GPE was more than 6.2${\times}$10$^{-3}$ S$.$$cm^{-1}$ / at room temperature. The GPE had good electrochemical stability up to 4.5 V vs. Li/Li$^{+}$. POAGA-based cells were showed good electrochemical performances such as rate capability, low-temperature performance, and cycleability. The cells, also, passed a safety test such as the overcharge and nail-penetration test.t.
다축하중이 작용하는 방진고무부품 피로손상 파라미터 결정에 관한 연구
문성인 ( Seong In Moon ),우창수 ( Chang Su Woo ),김완두 ( Wan Doo Kim ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.3
고무재료는 배합조건에 따라 기계적 거동이 다르기 때문에 피로수명평가를 위해 부품소재에 대한 물성데이터확보가 선행되어야 한다. 그러나 모든 종류의 배합조건을 고려하여 표준화된 재료물성을 확보하는 것은 현실적으로 불가능하다. 따라서 본 연구에서는 최소한의 제한된 실험으로부터 피로수명평가를 위한 입력물성을 선택하기 위한 방법을 제시하였으며, 피로수명 평가를 위한 최적 피로손상 파라미터를 결정하였다. 이러한 결과를 활용하여 부품의 피로수명 평가결과와 내구시험결과를 비교한 후, 본 연구에서 제안된 피로수명 평가절차의 타당성을 검토하였다. Rubber components have been widely used in automotive industry as anti-vibration components for many years. These subjected to fluctuating loads, often fail due to the nucleation and growth of defects or cracks. To prevent such failures, it is necessary to understand the fatigue failure mechanism for rubber materials and to evaluate the fatiguelife for rubber components. The objective of this study is to develop the durability analysis process for vulcanized rubbercomponents, which is applicable to predict fatigue life at initial product design step. The determination method of nonlinearmaterial constants for FE analysis was proposed. In order to investigate the applicability of the commonly used damage parameters, fatigue tests and corresponding finite element analyses were carried out and strain energy density was proposedas the fatigue damage parameter for rubber components. The fatigue analysis for automotive rubber components was performedand the durability analysis process was reviewed.