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이형민(Hyeong-Min Lee),김현주(Jung-Ki Lee),이정기(Hyun-Joo Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Temperature and velocity distributions of hot air flows in rotational molding machines with two<br/> different shapes and structures of oven and inlet were investigated by using FLUENT, a commercial<br/> computational fluid dynamics code. The shape and structure of oven and inlet in current rotational<br/> molding machine were improved. Two different sizes of mold inside each oven were considered in the<br/> analysis. Temperature and velocity distributions of hot air flows in two different rotational molding<br/> machines were compared to each other. In order to reduce cycle time and improve product quality in<br/> current rotational molding machine, the improved shape and structure of oven and inlet were proposed.
박준수,송성진,김영환,조현,임수용,윤남균,이정기,박영주 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
Ultrasonic testing method has been developed to evaluate adhesive layers in blast tube for the reliability of the rocket. The main objective of the present work was to find debonding and uncharged state between steel and FRP layers. We distinguish the debonding and uncharged state using the resonance method in the adhesive layers. It was found that the higher magnitude of ultrasound is reflected for the uncharged area in frequency domain, and shown good agreements with experimental results. The traditional ultrasonic pulse-echo method offers good implements for the distinction debonding area. The nondestructive testing results were compared with the micrography of destruective testing. As results, ultrasonic testing could be utilized for the evaluation of adhesive layer in the blast tube.