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왕겨분말 복합재료의 기계적 특성에 미치는 제조인자의 영향
최준용(J.Y. Choi),류재도(J.D. Ryu),윤호철(H.C. Yoon),임재규(J.K. Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In recent years, the use of natural as reinforcements in polymer composites to replace synthetic fibers like glass is presently receiving increasing attention. Because of their increasing use combined with the high demand, the cost of thermoplastic has increased rapidly over the past decades. In the present study we used a thermoplastic polymer(polypropylene) as the matrix and a lignocellulosic material)rice-husk flour) as the reinforcing filler to prepare a particle-reinforced composite to examine the possibility of using lignocellulosic materials as reinforcing fillers and to determine testing data for physical, mechanical and morphological properties of the composite according to the reinforcing filler content in respect to thermoplastic polymer. In this study, PLA/PP rice-husk fiber-reinforced thermoplastic composites that made the hot press moulding method according to manufacturing process was evaluated to mechanical properties.
7XXX계 단조재의 피로 및 파괴인성에 미치는 제조공정의 영향
이오연,임재규,송기홍,손영일,은일상,신돈수 ( O . H . Lee,J . K . Lim,K . H . Song,Y . I . Son,I . S . Eun,D . S . Shin ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.3
The purpose of this study is to investigate the effect of impurity level and fabrication processes on the strength, fracture toughness and fatigue resistance of 7075, 7050 and 7175 high strength aluminum forgings. It has been verified that plane strain fracture toughness and fatigue characteristics of a specially processed 7175S-T74 alloy is superior to a conventionally processed 7075-T6/T73, 7050-T74 and 7175-T74 alloys. These beneficial effects primarily arise from two view points, i.e., the effect of reducing the impurity level of iron and silicon has significantly diminished the size and volume fraction of second phase particles such as Al_7Cu₂Fe and Mg₂Si. Futher reduction of the amount of nonequilibrium second phase particles has been observed by applying a special fabrication process.
교류전류를 이용한 새로운 비파괴탐상법의 개발;표면결함과 이면결함의 평가 및 실기 부재의 결함 검출
김훈,임재규,Kim. H.,Lim, J.K. 대한용접접합학회 1995 대한용접·접합학회지 Vol.13 No.2
In the evaluation of aging degradation on the structural materials based on the fracture mechanics, the detection and size prediction of defect are very important. Aiming at nondestructive detection and size prediction ol defect with high accuracy and resolution, therefore, an lnduced Current Focusing Potential Drop(ICFPD) technique has been developed. The principle of this technique is to induce a focusing current at an exploratory region by an induction wire flowing an alternating current(AC) that is a constant ampere and frequency. Defects are assessed with the potential drops that are measured the induced current on the surface of metallic material by the potential pick-up pins. In this study, the lCFPD technique was applied for evaluating the location and size of the surface crack and blind crack made in plate specimens, and also for detecting the defects existing in valve, a field component, that were developed by SCC etc. during the service. The results of this present study show that surface crack and blind crack are able to defect with potential drop. these cracks are distinguished with the distribution of potential drop, and the crack depths can be estimated with each normalized potential drop that are parameters estimating the depth of each type crack. In the field component, the defects estimated by experiment result correspond with those in the cutting face of the measuring point within a higher sensitivity.
사이잘 섬유 강화 복합재료의 기계적 특성에 미치는 흡습의 영향
김효진(H.J. Kim),서도원(D.W. Seo),박한주(H.J. Pak),전양배(Y.B. Jeon),임재규(J.K. Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Woven sisal textile fiber reinforce composites are used to evaluates fracture toughness, tensile and three point bending. All specimens are producted that were repeated water absorption on five times and aged 400 day in this study. Two kind of polymer matrices such as epoxy and vinyl-ester are used. Fractured surface are taken to study the failure mechanism and fiber matrix interfacial adhesion. It is shown that in can be enhanced to improve their mechanical performance to reveal the relationship between fracture toughness and water absorption fatigue according to different polymer matrices.
단일 겹침 접착제 접합된 자연섬유강화 복합재료의 파괴강도 특성
윤호철(H.C. Yoon),송준희(J.H. Song),최준용(J.Y. Choi),Wang Renliang,임재규(J.K. Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper is concerned with a fracture strength study of composite adhesive lap joints. The tests were carried out on specimen joints manufactured hybrid stacked joints such as the original thermoset(polyester) composite, polyester and bamboo natural fiber layer and polyester and steel mesh. The main objective of the work was to test the fracture strength using hybrid fiber composites with a polyester and bamboo natural fiber layer adjacent to the material thickness and hybrid stacked joints. The results are presented using tensile-shear strength graph and finite element analysis. The failure mechanisms are discussed in order to explain the lower tensile-shear strength in hybrid stacked joints than in the original polyester composite joints.
이상용(S.Y. Lee),송준희(J.H. Song),임재규(J.K. Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In recent years there has been a growing interest for the use of natural fibers in composite applications due to their low cost, environmental friendliness, and good mechanical properties. The purpose of this study is to determine the characteristic of bending strength on bamboo fiber reinforced polymer composites. The parameters of RTM process depend on the weight ratio of bamboo fiber and resin, the number of bamboo ply and amount of hardening agent. Besides the existence of pore in composites according to vacuum time investigated a effect on mechanical properties of reinforced polymer composites. Test result shows that bending strength was a maximum(approximately 850kgf ㎝) value when composite thickness was 6㎜ and weight ratio of resin was 13.
대형버스 FRAME 용접결합부의 피로수명에 관한 실험적 연구
윤호상(H.S.Yun),서도원(D.W.Seo),임재규(J.K.Lim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
The joint parts' of bus frame are mostly made up of welding joint. By the impact and fatigue load, cracks initiate in the welding joint part, thus the frame come to final failure. So, it is necessary to improve the welding performance and fracture resistance of welding part in structure. In this study, the constant load fatigue test was carried out about the bus underbody frame, and it was studied how the fatigue life was affected by the influence of the plug welding method and dimensions.<br/> <br/>