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장철섭(Chul-Sub Jang) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.3
The performance of a rectangular fin, the relative value of the performance for L=0.1, and the ratio of the heat transfer from the fin tip to the total heat transfer from the rectangular fin were investigated using a two-dimensional analytical method. The variables are the Biot number and non-dimensional fin length. The relative resistance, effect, and efficiency increase as the non-dimensional length increases for a small Biot number (Bi≤0.1). On the other hand, the relative resistance and effect decrease and the relative efficiency increases as the non-dimensional length increases for a large Biot number (Bi≥0.7).
오승규,장철섭,한준영,이원,Oh Seung-Kyu,Jang Chul-Sub,Han Jun-Young,Lee Won 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.5
Application of bonding by adhesives can be found in many industries, particularly in advanced technological domains such as aeronautical and space, automobile and electronics industries. Periodic inspection with conventional ultrasonic NDE techniques is capable of indicating the presence and possible location of crack. Continuous ultrasonic attenuation monitoring has potential to supply information. This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between metal sheets. The method is based on the measurement of the reflection coefficient at the metal/adhesive interface. By means of a control experiment it is shown that Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Fracture Testing.
오승규(Oh Seung Kyu),황영택(Hwang Yeong Taik),장철섭(Jang chul Sub),이원(Yi Won) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency wave energy in adhesive joints was confirmed the transition by stress variation.
오승규(Oh Seung Kyu),윤송남(Yun Song Nam),황영택(Hwang Yeong Taik),장철섭(Jang Chul Sub),이원(Yi Won) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency wave energy in adhesive joints was confirmed the transition by stress variation.
장철섭,오승규,이원 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
This article has been investigated the use of FIT for adhesive joints analysis between metal sheets. The method is based on the measurement of the reflection wave at the metal/adhesive interface. After describing briefly the physical aspects of the phenomenon, an index is defined to detect defective zone of the joint(both for the lack of adhesive and for insufficient adhesion); the influence of the experimental variables(variable stress..,) on the measurement is discussed. By means of a control experiment it is shown that stress variation in adhesive joints are separate to be distinguished. In this paper, Nondestructive evaluation in adhesive joints are evaluated together with ultrasonic testing and finite element analysis.