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피로하중이 가해지는 외면겹치기 동시경화조인트의 파괴에 미치는 부식의 영향
신금철(Kum Cheol Shin) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.3
반복 인장하중이 가해지는 외면겹치기 동시경화조인트는 피접합물의 경계면 가장자리에서 균열이 발생하여 전체 파손에 이르게 되는데, 그 과정 중 피접합물의 경계면에서 발생하는 부식 현상이 중요한 영향을 미치게 된다. 그러므로 본 논문에서는 외면겹치기 동시경화조인트의 피로 파괴에 미치는 부식 현상의 영향을 규명하기 위하여 접합부 계면의 표면조도와 피접합물의 하나인 복합재료의 적층 각도의 변화에 따른 피로실험을 수행하였으며 유한요소해석을 통하여 얻은 경계면 응력 분포와 비교, 분석하였다. Co-cured single lap joints under cyclic tensile loads fail initially at the tip of the interface corner between the two adherents. The failure mechanism is complex because it is related to corrosion fatigue. Corrosion behavior at the interface affects the failure of the joints because corrosion deteriorates fatigue resistance. In this study, we clarified the cause of interfacial corrosion in co-cured single lap joints under cyclic tensile loads. The failure mechanism was also analyzed by observing the failed surfaces of specimens and the stress distribution along the interface. The surface roughness at the interface and the stacking sequence of the composite adherent were examined to investigate their effects on failure of the joint.
김영헌(Young Heon Kim),오제훈(Je Hoon Oh),신금철(Kum Cheol Shin),윤민재(Min Jae Yoon),민병권(Byeong Gwon Min),박진규(Jin Gyu Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
As automotive industry become quieter, the interest in the wiper is increasing. The wiper system of a car is carried out the wiping of the windshield for securing a clear view. The most of complaints of wiper concern operation noise. The noise operation can be classified into three main categories namely, chattering, reversal vibration and squeal noise. In this paper, we focus on reversal vibration mainly occurred by reversal action. We use commercial software ANSYS for finite element analysis (FEA). The real behavior of wiper blade was observed by high speed camera (HSC). To reduce operation noise caused by reversal vibration, we use design of experiment (DOE) method for important variables such as friction coefficient, input force and damping coefficient.
복합재료 적층판에 삽입된 광섬유 센서의 기계적 특성에 관한 연구
이정주,신금철,권일범 한국센서학회 1999 센서학회지 Vol.8 No.6
Tensile stress loaded on smart composite structures and thermal stress occurred during the curing process of the smart composite materials with embedded optical fiber sensors affect directly the mechanical behavior of the embedded optical fiber sensors within the smart composite structures. Stress distribution within the optical fiber sensors varies with respect to the stacking sequence of the composite laminate and the coating conditions of the optical fibers. The cracks occurred within the composite laminate affect not only the fracture of the composite laminate but also the fracture of the optical fiber sensors embedded within the composite laminate. In this study, firstly, stress distribution of the optical fiber sensors embedded within the composite laminate which is subjected to the tensile and thermal stresses was analyzed using Finite Element Method. And, secondly, the effect of the stacking sequence of the composite laminate and the coating conditions of the optical fiber sensors on the stress distribution of the optical fiber sensors was investigated. Finally, the effect of the crack occurred within the smart composite laminate on the fracture behavior of the optical fiber sensors was also observed through the tensile test.