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Glass/phenol 복합적층판의 저속충격 특성-온도의 영향
김후식(Hu Shik Kim),김재훈(Jae Hoon Kim),이영신(Young Sin Lee),한영욱(Young Uk Han),박병준(Byoung Joon Park),안병욱(Byoung Wook An) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study. low velocity impact tests and compression-after-impact(CAI) tests have been used to evaluate the effect of temperature on the low velocity impact characteristics of phenol-matrix composites reinforced with woven glass-fabric. Drop weight(low velocity) impact causes three principle types of damage in laminates. namely matrix cracking, delamin-ation, and fiber breakage, which together can seriously degrade residual compressive strength in laminates. The distribution of impact damage for the various temperature. can be determined from ultrasonic C-scan images. and the shape of damage is approximately elliptical. The damage area increases with increasing temperature and impact energy. All these observation indicate reduced impact damage tolerance of the laminates at evaluted temperature.
김용진(Yong Jin Kim),홍원석(Won-Seok Hong),정상현(Sang-Hyoun Jeong),송영훈(Young-Hoon Song),엄희문(Hee-Moon Eum),장경룡(Kyoung-Ryong Chang),박태성(Tae-Sung Park),심재구(Jae-Gu Shim),한영욱(Young-Uk Han) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Non-thermal plasma can be used to promote chemical reactions to reduce the emission of gaseous pollutants. With such a technique, oxidizing radicals such as OH, HO₂ and O are produced and the reaction of SO₂ and NOx with radicals yield several acids that can be neutralized by injecting ammonia into the gas; the final products, being aerosol particles, can be removed from the flue gas in a particle collector. The size distribution of particulates formed by non-thermal pulsed plasma DeSOx-DeNOx process is analyzed. Experimental studies of particle collection are carried out using fibrous filter and electrostatic precipitator.