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안중혁(Joong-Hyok An),전윤배(Yun-Bae Jeon),이남필(Nam-Pil Lee),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this study, to obtain the width effect on tensile property for NiCo thin film, the specimens were fabricated by etching process to make a smooth specimen of 2000 ㎛ length with 300 ㎛ of gage length, 10 ㎛ thickness and 3 kinds of width, 50, 100, 200 ㎛. These specimens had brittle characteristic, and values about 161±5.1 ㎬ of Young’s modulus without effect of width. There were tendency that specimens with smaller width have high fracture strength. The fracture strength for the width of 50, 100, 200 ㎜ were 1415.9±68.29, 1171.2±68.74, 1093.3±89.51 ㎫, respectively.
안중혁(Joong-Hyok An),김윤재(Yun-Jae Kim),박준협(Jun-Hyub Park),김상주(Sang-Joo Kim),김영진(Young-Jin Kim),이영제(Young-Ze Lee) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.2
This paper compares of mechanical tensile properties of 6 kinds of copper foil. The beam lead made with copper foil. Different from other package type such as plastic package, Chip Size Package has a reliability problem in beam lead rather than solder joint in board level. A new tensile loading system was developed using voice-coil actuator. The new tensile loading system has a load cell with maximum capacity of 20 N and a noncontact position measuring system based on the principle of capacitance micrometry with 0.1 ㎚ resolution for displacement measurement. Strain was calculated from the measured displacement using FE analysis. The comparison of mechanical properties helps designer of package to choose copper for ensuring reliability of beam lead in early stage of semiconductor development.
안중혁(Joong-Hyok An),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The copper film coated by Sn is often used in various applications such as LCD, Mobile Phone and etc. Especially, when the film is used as tape carrier package(TCP) of LCD panel, the film is repeatedly applied by mechanical or(and) thermal stress and then is often failed. Therefore, to guarantee the reliability of the electrical devices using the film, the tensile and fatigue characteristics of the film are important. In this study, to obtain the tensile and fatigue characteristics of the film, the specimen was fabricated by etching process to make a smooth specimen of 2000 ㎛ width, 8000 ㎛ length and 15.26 ㎛ thickness. The 2 kinds of specimen were fabricated by other manufacturing process. These specimens had values of Young's modulus(80.2㎬) lower than literature values(108~145㎬) for bulk values, but had high values of the yield and ultimate strength as 317㎫ and 437㎫, respectively. And fatigue test of load-control with 20㎐ frequency was performed.
안중혁(Joong-Hyok An),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper compares of mechanical tensile properties of 6 kinds of copper foil. The beam lead made with copper foil. Different from other package type such as plastic package, Chip Size Package has a reliability problem in beam lead rather than solder joint in board level. A new tensile loading system was developed using voice-coil actuator. The new tensile loading system has a load cell with maximum capacity of 20N and a non-contact position measuring system based on the principle of capacitance micrometry with 0.1㎚ resolution for displacement measurement. Strain was calculated from the measured displacement using FE analysis. The comparison of mechanical properties helps designer of package to choose copper for ensuring reliability of beam lead in early stage of semiconductor development.
안중혁(An Joong-Hyok),최승현(Choi Seung-Hyun),이재옥(Lee Jae-Ohk),김병주(Kim Byung-Joo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Bolting system is generally analyzed by simple FE model, where pre-tension is applied onto the bolt after tying the unthreaded surfaces of the male and the female screw parts. This ‘pre-tension’ method provides meaningful results in axial direction of the bolt without a laborious modeling of the bolt thread. However, the results in circumferential direction by ‘pre-tension’ method show no validity because of the tied boundary condition itself. For example, circumferential deformations around the tap hole are far from the actual once. This paper presents an indirect FE analysis method for the tapped female screw part to avoid the aforementioned problem by combining a detailed 2-D FE analysis results and a more simplified 3-D FE analysis. An example to demonstrate the validity of the suggested indirect FE analysis method is also presented.
관통균열이 있는 곡관에 내압이 가해질 때 나타나는 응력확대계수의 경향
안중혁(Joong-Hyok An),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Although the pipe bend is the most commonly used component in pipeline system, useful assessment solutions for stress intensity factor of pipe bends are not exist. This paper shows the trend of the stress intensity factor for pipe bends with through-walled crack under internal pressure based on the FE analysis. The trend is different from existing solutions of straight pipe.
안중혁(Joong-Hyok An),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper describes a tensile test of copper to investigate the test speed effect on mechanical properties. The copper is often used in micro-electro-mechanical systems(MEMS) devices and tape carieer package(TCP). A non-contact position measuring system based on the principle of capacitance micrometry with 0.1 ㎛ resolution for displacement measurement was used. The specimens were made with dimensions of 8000 ㎛ of gage length, 15.26 ㎛ of thickness, 2000 ㎛ of width. The tensile tests were performed under three level of tensile speed. These specimens had measured values about 80±0.5 ㎬ of Young’s modulus and 338.6±5.87 ㎫ of 0.2 % offset yield, respectively, without the effect due to different speed. But, for tensile strength, there were tendency that specimens with the high speed have the high tensile strength. The tensile strength for the speed of 50, 100, 200 ㎛/min were 454.1±2.99, 459.8±4.75, 468.7±3.00 ㎫, respectively.
전윤배(Yun Bae Chun),안중혁(Joong-Hyok An),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, fatigue tests were performed for NiCo which is widely used in MEMS devices. Mechanical properties of thin film are important for design the mechanical structure and components. Mechanical properties of thin film are not same as those for bulk materials. Therefore, the production of thin film and the experiment is needed. The width of specimen is 50, 100, 150 ㎛. In the fatigue test of thin film, it is difficult to perform the fatigue test at R=-1. However, the result of the fatigue test at R=-1 should be required when fatigue life prediction is performed. Therefore, in this study, the modified Goodman method, Gerber method and Soderberg methods were be considered to investigate which method is most reasonable when mean stress is considered.
박준협(Jun-Hyub Park),안중혁(Joong-Hyok An),김윤재(Yun-Jae Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This paper describes a tensile test of Su-8 to investigate the size effect on mechanical properties. The Su-8 is often used in micro-electro-mechanical systems(MEMS) devices. A non-contact position measuring system based on the principle of capacitance micrometry with 0.1㎚ resolution for displacement measurement was used. The tensile tests were performed using the developed tester and specimen. The specimen were made with dimensions of 2000㎛ long, 2 kinds of thickness, 9, 11㎛ and 3 kinds of width, 50, 100 and 150㎛. Behaviors of Su-8 have the 3kinds of stress-strain curve, showing characteristics brittle, ductile and polymer. However, it was found that the mechanical properties of Su-8 did not have an effect on thickness and width.
감육배관의 저주기 피로 평가를 위한 국부 탄소성 변형률 평가 방법
윤기봉(Kee Bong Yoon),마영화(Young Wha Ma),안중혁(Joong Hyok An),김윤재(Yun Jae Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In order to assess the integrity of pipes with local thinning area, the plastic strain as well as the elastic strain at the root of thinned region are required particularly when fluctuating load is applied to the pipe. For estimating elastic-plastic strain at local wall thinning area in a straight pipe under tensile load, an estimation model with idealized fully circumferential constant depth wall thinning area is proposed. Based on the compatibility and equilibrium equations a nonlinear estimation equation, from which local elastic-plastic strain can be determined as a function of pipe/defect geometry, material and the applied strain was derived. Estimation results are compared with those from detailed elastic-plastic finite element analysis, which shows good agreements. Noting that practical wall thinning in nuclear piping has not only a circular shape but also a finite circumferential length, the proposed solution for the ideal geometry is extended based on two-dimensional and three-dimensional numerical analysis of pipes with circular wall thinning.