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조규재(Gyu-Jae Cho),이승철(Seung-Chul Lee),정성택(Seong-Taek Jeong) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
CFRP composite materials are used increasingly in various fields such as space and aviation industry, architectural structures, shipbuilding materials, sporting goods, and interior materials of automobiles due to the excellency of mechanical characteristics as well as light weight, heat resistance, and control characteristics. Stacking plates of CFRP composite materials, which are used increasingly because of these unique characteristics, have the properties of uneven quality and anisotropic nature unlike general metallurgical materials as they are stacking plates of composite materials in the combination of different types of materials. Hence, in this thesis, specimens of stacking composition of stacking plates of CFRP composite materials were manufactured by changing orientation angles in three kinds of quasi-isotropic such as (0˚/45˚/90˚/-45˚)6S, (0₃˚/45₃˚/90₃˚/-45₃˚)2S, and (0₆˚/45₆˚/90₆˚/-45₆˚)S and also in three kinds of orthotropic such as (0˚/90˚/0˚/90˚)6S, (0₃˚/90₃˚/0₃˚/90₃˚)2S, and (0₆˚/90₆˚/0₆˚/90₆˚)S. In this study, it was possible to obtain the following results by carrying out 3-point bending testing and transverse bending testing order to find out mechanical characteristics according to orientation angles by stacking in 6 different types with the changes of stacking composition methods of CFRP composite materials. As interface number increases, the maximum load was increased and specimens stacked in quasi-isotropic haulage operations in its maximum load rather than orthotropic. Therefore, it is judged that it is correct to stack in quasi-isotropic when composing stacking of CFRP composite materials.
조규재(Gyu-Jae Cho),이승철(Seung-Chul Lee),정성택(Seong-Taek Jeong) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
In today’s rapidly developing and highly specialized industrial society, it is most important to develop new materials and properly apply and use those materials. For the automobile industry in particular, it is considered the most effective alternative for improving fuel efficiency to make the car body lightweight. The most representative technology that has been developed so far to make the car body lightweights to make the structure with such lightweight materials as super lightweight steel and aluminum composites. Performance of structures like car body is significantly influenced by the joint. Once their surfaces are processed, separately manufactured structures are either bonded together using the adhesive or mechanically tightened together using bolts and nuts. In order to use bolts, it is necessary to make holes. In this research, Inter laminar delamination of the exit area are measured.
조규재(Gyu-Jae Cho),박종남(Jong-Nam Park) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The Titanium has many superior characteristics Which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. this study performed turning operation of Ti-6Al-4V alloy using the TiAlN Coated Tool which treated PVD. Experimental works are also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study. Tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0㎜ of cutting depth.