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윤태호(T.H.Yoon),김갑용(G.Y.Kim),김두만(D.M.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
Among many methods in inspection of ball-bearing. The major parts of a rotating body. The method by loss of driving motor’s input power or vibration/noise measurement has usually been used in korea. In advanced nation like Japan. However. The method of torque measurement has been applied to examinate the exact bearing loss which is necessary in the grade-decision and the quality-upgrade lately.<br/> In this project. Exact bearing loss is gained by the method of torque measurement about several bearing specimens using the low capacity torque transducer with the type of strain gage. This equipment inspects exact bearing loss superior to the method of vibration measurement and loss of driving motor’s input power. Also doesn’t influenced by working place. The precise and systematic method in inspection of bearing loss will be set up through this project. And this equipment can be utilized for bearing productions of high precision class in industries in future.<br/>
우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상 연구
윤태호 ( T. H. Yoon ),차영미 ( Y. M. Cha ),육종일 ( J. I. Yuck ),백종규 ( J. G. Paik ),오영준 ( Y. J. Oh ),김희재 ( H. J. Kim ) 한국복합재료학회 2011 Composites research Vol.24 No.6
우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상을 고찰하였다. 첫째로 우레탄 수지와 비닐에스터 수지를 스프레이 코팅하여 프리프레그를 제조하였으며, 수지함량을 21%로 조절하였다. 또한 혼합수지를 스프레이 코팅과 필름코팅으로 비교를 위한 프리프레그를 제조하였다. 그 다음 이들을 상온에서 1-2시간, 그리고 필요 시 100℃ 에서 30분 정도 건조시켰다. 이들 프리프레그를 24층 적층한 다음 120℃에서 5분 동안 정치 시킨 후 25분 동안 150 kg/㎠ 압력하에서 경화 시켰다. 모의 파편탄(17 gr)을 이용하여 이들 복합재료의 방탄성능(V50)를 측정하였으며, UP127 및 EB8200으로 제조된 시편은 XSR10으로 제조된 시편에 비하여 각각 6.5 및 9.0 % 향상된 값을 보였다 Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema(R)/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema(R) fabric at 21% resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at 100℃ for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 Layers and cured at 120℃ for 5 min under the contact pressure and for additional 25 min at 150 kg/㎠. Finally, the anti-bullet properties of composite samples were evaluated by measuring V50 with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of V50 with UP127 and EB8200, respectively.