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STS 304 TIG 용접시 발생하는 열응력 해석에 관한 연구
고준빈,최원두,이영호 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.6
Residual stress caused in the weldments with high restraint force are often during welding observed in the weldments of large size nozzles or radial tanks. The reason is that quantitative analysis about thermal stresses during welding is lack for this weldments. To verify FEM theory, the temperature was measured with thermocouple in a real time in this paper. Also analysis of the thermal stress for welding condition is performed by ABAQUS program package on various welding condition in STS butt welding.
STS304 TIG 용접시 발생하는 잔류응력과 열응력 해석에 관한 연구
고준빈,박희상,Ko, Jun-Bin,Park, Hee-Sang 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.5
Residual stress caused in the weldments with high restraint force are often during welding observed in the weldments of large size nozzles or radial tanks. The reason is that quantitative analysis about thermal stresses during welding is lack for this weldments. To verify Finite Elements Method(FEM) theory, the temperature was measured with thermocouple in a real time in this paper. Also analysis of the thermal stress for welding condition is performed by ABAQUS program package on various welding condition in 304 stainless steel butt welding.
로드셀을 이용한 STS304 박판용접부의 구속력 측정에 관한 연구
고준빈,최원두,이성구,박성두,이영호 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.5
The restraint force is required an accurate measurement and analysis to protect weldment from residual stress. Also, this residual stress caused by clacks in weldments are often observed in the weldments of large size nozzles or radial tanks after welding. This paper is preformed on the study of evaluation of welding restraint forces using load cell with STS thin plate which are using pressure vessel steel in the industry field. As a result of this study, as the welding currents are higher and the welding speeds are more slowly, the magnitude of restraint force in process of the flat plate welding hows to be more large. Also, the temperature in process of melting is increasingly rising, then the restraint forces exhibit the compressive forces, whereas the restraint forces during cooling represent extensional force.
초공간을 고려한 SA 508강의 재질열화 시계열 신호의 카오스성 평가
고준빈,윤인식,오상균,이영호 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.6
This study proposes the analysis method of time series ultrasonic signal using the chaotic feature extraction for degradation extent evaluation. Features extracted from time series data using the chaotic time series signal analyze quantitatively degradation extent. For this purpose, analysis objective in this study is fractal dimension, lyapunov exponent, strange attractor on hyperspace. The lyapunov exponent is a measure of the rate at which nearby trajectories in phase space diverge. Chaotic trajectories have at least one positive lyapunov exponent. The fractal dimension appears as a metric space such as the phase space trajectory of a dynamical system. In experiment, fractal correlation) dimensions, lyapunov exponents, energy variation showed values of 2.217∼2.411, 0.097∼ 0.146, 1.601∼1.476 voltage according to degardation extent. The proposed chaotic feature extraction in this study can enhances precision ate of degradation extent evaluation from degradation extent results of the degraded materials (SA508 CL.3)
비구면 렌즈의 설계 및 제조를 위한 칼코게나이드계 유리의 물리적 화학적 특성 연구
고준빈,김정호,Ko, Jun-Bin,Kim, Jeong-Ho 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
In recent years the research has been focused on the preparation of special glasses, i.e., chalcogenide and heavy metal oxide ones that can transmit optical radiation above 2 um and also other optical parameters exceed those of silica based glasses. The attention in this paper is focused on chalcogenide glasses, on preparation of high quality base glass, for an application in infrared optical product design and manufacture. The amorphous materials of As-Se and Ge-As-Se chalcogenides were prepared by a standard melt-quenching technique. The compositions were mesaured by ICP-AES and EPMA, and structural and thermal properties were studied through various annealing processes. Several anomalies of glass transition and crystallization were observed in the DSC/DTA/TG results of the chalcogenide glass.
Optical Properties of Organic Thin Film Transistors
고준빈,임상철,김성현 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.3
Flexible electronic devices or stretchable electronic devices have recently attracted increasing attention. Organic semiconductor transistors have been intensively studied for such applications, as for the operation of display pixels and various sensors, and for use in logic circuits consisting of organic semiconductor transistors. When organic thin film transistors (OTFTs) are employed for the operation of display pixels or for use as transparent substrate-based sensors, the properties of the OTFTs may be changed by the light illuminating the OTFT from itself or from the outside, thus degrading circuit stability. In the present study, an OTFT was fabricated on a glass substrate by using pentacene, and light of different wavelengths and intensities was illuminated through the top and the bottom of device to investigate the additional photocurrent flowing through the OTFT. The experimental results showed that the photocurrent in a 100 nm-thick OTFT thin film had a symbatic pattern and that the photocurrent nonlinearly increased with increasing light intensity.
구멍뚫기법(HDM)에 의한 STS 304 용접부의 잔류응력 해석에 관한 연구
고준빈,최원두,이영호 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.6
The HDM(Hole Drilling Method) is a relatively simple and accurate methods in measuring residual stress of weldment. Various method of evaluating residual stress are studied in welding field. The method of cutting holes on the plate much affects the accuracy of result. Especially for the hard material like stainless which is difficult to cut preciously is difficult to measure residual stress of weldment. Because heat conduction of strainless steel is lower than other general steel, the magnitude of residual stress might be different as to changing of welding conditions. Therefore, the distribution of residual stress on the STS304 steel after welding using HDM is evaluated in this paper.