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AJM을 이용한 HDM에 의한 잔류응력 계측에 관한 연구 1
이택순 대한용접접합학회 1988 대한용접·접합학회지 Vol.6 No.3
The Hole Drilling Method(HDM) is widely used to measure residual stresses in the welded structures. The purpose of this study is to evaluate the accuracy fo measuring residual stresses when drilling the hole by Air-abrasive Jet machine(AJM). Simulated residual stresses wre introduced by applying known stresses to steel bars. These known streses were then compared with measured stresses relaxed from hole drilling. the obtained results are summarized as follows; 1) It was possible to obtain well defined holes with the nozzle designed for this study. 2) If the hole shape is not cylindrical, critical may occur. 3) In the uniaxial strain field, the measurement error of the maximum principal stress was within .+-.10 percent. The orientation angle of the maximum principal stress was within 8.deg. from the given directioin. 4) meausrements were made varying hole depths. Little or no change of stresses occurs since holse were drilled more than the depth of the 0.6 times diameter. 5) The air-abrasive jet machining for drilling holse does not cause appreciable apparent stresses which si critical to measure residual stresses.
李澤淳 嶺南大學校 工業技術硏究所 1980 연구보고 Vol.8 No.1
The present paper explains the effect of fillet size and depth of penetration on them. A model specimen; having profile of cruciform fillet twelded joint, is used for the performed in the range from 5mm to 2. 9mm leg length and -2mm to 13mm depth of penetration. The results obtained are as follows 1) The yield strenth of fillet welded joint is not affected by fillet size but the maximum strength decreases with increase of fillet size. 2)The yield strength and maximum strength of fillet welded joint are represented as a function of the penetration angle θ, and they increase with increase of the penetration angle θ.
고농도유기성폐수의 호기성소화처리에 있어서 정화기구에 미치는 온도의 영향에 관한 동력학적 연구
李宅淳 國立 昌原大學校 産業技術硏究所 1988 産技硏論文集 Vol.2 No.-
The principal objective of this investigation was to study the effects of temperature on organic mater purification system in aerobic digestion treatment of high concentration organic waste-water. Chemostat-type bench scale experimentals reactors were used in this study. Digestion time were 6, 7, 10, 15, 20 and 30 days. Digestion temperature were 5℃, 10℃, 15℃, 20℃, 25℃, 30℃, 35℃. The following conclusions can be draw from the experimental results. Two-phase model is applicable in substrate removal type of aerobic digestion process of high concentration organic waste-water. At temperatures ranging from 20℃ to 30℃, accumulation of non-degradable compounds become more and more conspicuous. At temperatures ranging from 5℃ to 25℃, substrate removal rate is increase about 1.6 times in case temperature of 5℃ increase.
이택순 대한기계학회 1977 大韓機械學會誌 Vol.17 No.3
이글에서는 1. 스폿트 용접 Robot 2. 아아크 용접 Robot 3. 용접로봇트의 문제점 4. 용접기술의 응용 등에 관하여 알아보았다.
2상계 스테인리스강 용접부의 피로크랙전파 특성 (III)
이택순,권종완 대한기계학회 1989 대한기계학회논문집 Vol.13 No.5
본 연구에서는 2상계 스테인리스강의 모재 및 용접부에 대하여 대기중의 피로시험과 인공해수중의 부식피로 시험을 모재부와 용접부의 .alpha.,.gamma.상의 상비율 변화에 따른 조직의 변화 및 용접잔유응력의 영향이 크랙전파에 미치는 영향을 검토하였다. 응력-스트레인의 히스테리스곡선에서 균열닫힘 거동을 실측하고 이들의 결과로 부터 유효응력확대계수와 균열전파속도와 관계를 정리하여 이들의 문제를 해석하였다. Corrosion fatigue crack propagation behavior of duplex stainless steel weldments in substitute ocean water was investigated to evalulate effects of micro-structural change and residual stresses. Fatigue crack propagation rate was found influenced markedly .alpha./.gamma. phase ratio but little by residual stresses. Fatigue crack propagation rate is higher in the corrosive environment than in room atmosphere. The crack propagation rate estimated by the measurement of striation spacing was higher than that, obtained by crack length measurement in low .DELTK.K region. At hight .DELTK.K region, however, both crack propagation rates were found to be identical.
탄소섬유/에폭시 복합재료의 Mode I 층간파괴거동에 미치는 섬유배향각의 영향에 관한 연구
이택순,최영근 대한기계학회 1995 대한기계학회논문집 Vol.19 No.2
Several tests of the Double Cantilever Beam(DCB) were carried out for influence of the fiber orientation on the Mode I of the interlaminar fracture behavior in the Carbon/Epoxy composites. The interlaminar fracture toughness of Mode I was estimated based on the energy release rate of Mode I, $G_{I}$. The fracture toughness at crack initiation, $G_{IC}$, increases from type A to type E. The fracture toughness, $G_{IR}$ , is almost constant macroscopically for type A and type E when crack propagates. $G_{IR}$ for types B, C, D increases rapidly at the beginning of the crack growth then it decreases gradually. The fracture surface observation by SEM was also obtained the same results. Consequently the influence of the fiber orientation on the Mode I Interlaminar fracture behavior was made clear.ear.