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정규상(Gyusang Jeong),원삼용(Samyong Won),문진성(Jinsung Moon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The majority of fly ash pipes in thermal power stations use steel pipes. This makes frequent replacement inevitable due to severe abrasion near the hot and curved section of pipes. Recently, there have been efforts to prevent this abrasion with lining techniques using ceramic or basalt on the inner wall of the pipe. This study uses composite and anti-wear material to maximize the anti-abrasion effects on the hot section of the pipe. The thickness of the abrasion layer was determined by the abrasion ratio of material found through the experiment; the thickness of the reinforcement layer was determined by micromechanics. Experiments were conducted on epoxy resins to test for heat and abrasion. Anti-abrasion test using particle impingement was intended to recreate realistic conditions when abrasion occurs within the hot section of an actual pipe. This study analyzes the abrasion ratio obtained from both the specimen experiment and from on-site measurement and provides evidence that a combination of composites and anti-wear agent can be used to create a fly ash pipe that is lower in costs and higher in quality than what is used currently.
고승기(S.K. Koh),김병운(B.W. Kim),원삼용(S.Y. Won),류창훈(C.H. Ryu) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In order to investigate the behaviors of fatigue crack propagation of SiC-particulate-reinforced Al-Si metal matrix composites, fatigue tests using single edge notched tension(SENT) specimens were performed. Composite materials were manufactured by using both permanent die casting and extrusion processes with different volume fractions of 10% and 20%. SiCp-reinforced AI-Si composites showed higher levels of threshold stress intensity factor range, ??K??, for the higher volume fractions of SiC particles, implying the higher fatigue crack propagation resistance at the threshold or low ??.K level, compared to the unreinforced Al-Si alloy. Extruded materials showed higher values of threshold L'.K than the cast materials. However, the composites showed similar or lower resistance of fatigue crack propagation at the Paris region compared to the unreinforced Al-Si alloy. Stress intensity factor range at fracture decreased. as the volume fraction of SiC particle increased due to the lower fracture toughness of composites with higher SiCp volume fraction.<br/>