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奇文奉,李盛鎬,金秀生 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
For the purpose of treating the sludge which contains hazardous heavy metals, various kinds of studies were made on the unconfined compressive strength which various with the ratio of portland cement. Aluminum sulfate and sodium silicate, the effects upon cements binding influenced by moisture content, volatile solid and pH of sludge, and the amount of leaching solution which comes after cement binding. Erief results from the said studies are as following; 1. As a result of compression tests at various mixing ratio of binders, the highest intensity was found at the ratio of portland cement(0.4) + aluminum sulfate(0.05) + sodium silicate(0.05) + sludge(0.5). Generally the compressive strength tends to be in direct proportion with period of curing. 2. In case that sludge was binded at the same mixing ratio of binders to sludge, the compressive strength was increased and the amount of leaching solution was decreased at low content of moisture and volatile solid and high pH of sludge. 3. while the compressive strength is over than 9.0㎏/㎠, the hazardous heavy metals are not leached from the brick. 4. As the C/S ratio of binders was increasing, the amount of leaching hazardous heavy metals was decreasing. When binders were mixed at the ratio;portland cement+Aluminum sulfate(0.1)+Sodium silicate(0.1) and the C/S ratio of binders were 0.5, leaching solution amount was minimum. 5. The compressive strength of the sludge in the moisture content of 70% to 75% is made of over than 10㎏/㎠ at the curing of 28 days. When binders were mixed at the ratio; portland cement were over 0.5 of the C/S ratio, portland cement+Aluminum sulfate(0.1) were over 0.35 of the C/S ratio, portland cement+Sodium silicate(0.1) were over 0.35 of the C/S ratio and portland cement+Aluminum sulfate(0.05)+Sodium silicate(0.05) were over 0.25 of the C/S ratio.
한승무,김문생 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.5
본 연구에서는 초음파 속도와 광역 감쇠를 이용하여 연골의 강도를 평가하였다. 먼저 60개의 시편을 인체의 연골로부터 얻어서 초음파 속도와 광역 감쇠를 각 시편에 대하여 측정하였다. 시편들은 동일한 두개의 그룹으로 나누어, 0.0004 s-¹와 0.08s-¹의 변형률에서 압축 하중을 작용시킨 후 각 시편에 대한 최대 압축 강도값을 결정하였다. 그 결과, 0.08s-¹에서 측정된 시편들은 0.0004-¹로 측정된 시편들 보다 63%나 더 높은 평균 강도값을 나타내었다. 초음파 속도와 광역 감쇠는 고변형률 및 저변형률 모두에서 골 강도와 밀접한 연관성을 나타내었다. 또한, 골 강도는 모든 변형률에서 초음파 속도와 광역 감쇠의 선형 조합과도 밀접한 관련성을 보였다. 초음파 파라미터의 사용은 여러 가지 골절에 대한 연골의 저항능력을 평가하기 위한 임상 진단법으로 훌륭한 수단이 될 수 있을 것이다. The prediction of bone strength by ultrasound velocity and broadband ultrasound attenuation was examined. Ultrasound velocity and broadband attenuation were measured for sixty specimens of human trabecular bone. Samples were divided into two equal groups and loaded in compression at the strain rates of 0.0004 s-¹and 0.08 s-¹. The ultimate strength was determined for each specimen. Specimens tested at 0.08 s-¹had a mean value of strength 63% higher than the specimens tested at 0.0004 s-¹. Ultrasound velocity and broadband attenuation were significantly associated with compressive strength at both strain rates. Mechanical strength was also correlated strongly with a linear combination of ultrasound velocity and broadband attenuation for both the low and high loading rates. The use of ultrasound parameters may provide good clinical means for assessing the resistance of trabecular bone to both low and high energy trauma.
CFRP 적층복합판의 충격 손상 예측 : PartⅡ: 실험 PartⅡ: Experiment
박승범,김문생 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.52 No.-
본 논문에서는 충격하중에 의하여 적층복합재의 내부에 발생하는 충격 손상의 발생과 진전에 대하여 연구하였다. 이를 위하여 강구에 의하여 횡방향 충격을 받는 CFRP 복합재료에 대하여 충격실험을 행하여, 초음파 탐조영상장치로 충격손상을 관찰하였다. 개발한 충격손상 유한해석에 의하여 예측된 결과와 비교 검토하였다. 충격에 의하여 발생하는 손상중 가장 큰 손상의 형태는 층간분리 손상으로서 충격이 계속 진행됨에 따라 경계면을 따라 진전되며, 길이방향은 경계면에 인접한 아래 단층의 섬유방향을 향한다. 충격을 가하는 외부 물체의 충격속도가 증가함에 따라 층간분리의 길이와 폭은 거의 선형적으로 증가하였다. 그리고 횡방향의 폭의 증가율 보다 종��향의 길이의 증가율이 더 크게 나타났으며, 층간분리의 진전은 주로 종방향인 길이방향으로 진행되었다. An investigation was performed to study the initiation and propagation of impact damages in laminated composites subjected to transversely impact of steel ball. For this purpose, transversely impact experiments for CFRP laminated composite plates were conducted, and impact damages were observed using the ultrasonic image scan system. As a results, interface delamination was a major impact damage mode and the longitudinal direction of the dilamination paralled to the fiber direction of the bottom layer below the interface. A linear relationship holds between impact velocity and the longiudinal length and transverse width of delmaination, and the ratio of growth in the longitudinal direction is high than in the transverse direction.
충격하중을 받는 유리의 콘크랙형성에 대한 실링재료의 영향
김문생(Moon Saeng Kim),허진(Jin Heo),이현철(Hyeon Chul Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In order to investigate the possibility of processing of brittle material by ball impact, the effects of scaling materials about impact damage of soda. lime glass by small spheres were evaluated experimentally. It was investigated that crack appearance developed in soda-lime glass with scaling materials of Aluminum, PVC and Polyurethane by impact velocity. The adoption of sealing materials in the development of perfect cone crack was more effective than without scaling materials. In the case of 3mm steel ball, PVC sealing was more effective in producing perfect cone cracks than other two materials. Also the impact velocity range of the formation of the cone crack was influenced by both the thickness and the size of impact ball. Therefore, choosing an appropriate materials can hopefully be used to form cone crack more effectively.
충격하중을 받는 유리의 콘크랙형성에 대한 경계조건의 영향
김문생(Moon Saeng Kim),허진(Jin Heo) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
In order to investigate the possibility of processing of brittle material by ball impact, the effects of boundary conditions about impact damage of soda-lime glass by small spheres were evaluated experimentally. It was investigated that crack appearance developed in soda-lime glass with boundary conditions of without sealing, single sealing and double sealing by impact velocity. The double sealing in the development of perfect cone were most effective than other boundary conditions. In case of double sealing condition, PVC sealing was more effective in producing perfect cone cracks than Al, PU sealing. Also the impact velocity of the formation of the cone crack was influenced by contact area and maximum dynamic load.
지게차용 습식 브레이크 스퀼소음의 특성 및 측정실험에 관한 연구
김태종(Kim, Tae-Jong),정의봉(Jeong, Weui-Bong),김문생(Kim, Moon-Saeng),김영현(Kim, Young-Hyun),주원호(Joo, Won-Ho) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.10
Elimination of squeal noise occurred during brake application is an important task for the improvement of comforts in an industrial forklift. In this paper, a test rig was developed which was possible for testing of brake noise and an experimental measurement on squeal noise was performed. The causes of the brake noise are identified by experimenting how the factors such as automatic transmission fluid and rpm of drive axle affect the squeal. In order to identify the squeal characteristics, the signal analyses for noise are performed by using frequency spectrums. Also, brake test using a forklift was carried out to confirm the reliability of test results by using a test rig comparing with the occurrence of squeal noise. Experimental results showed that the tendencies of occurrence of squeal noise are well agreed at two test methods by using the test rig and forklift.