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INCONEL 690 합금의 고온 프레팅 특성에 관한 연구
정한규(Han-Kyu Jeung),윤동환(Dong-Whan Yoon),박대규(Dae-Kyu Park),권재도(Jae-Do Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, fretting fatigue test of INCONEL alloy 690 caused which is currently using the steam generator tube of nuclear power plants. this factor has carried out in high temperature of 320℃, As a result of all these factors will be compared and analyzed between the fretting fatigue results of room temperature and the normal fatigue test results of high temperature atmosphere. Through the friction force of contact area for rep eat cycle, to the effect that result are analyzed in high temperature atmospheres. The high temperature fretting fatigue mechanisms are analyzed with observation of a fracture surface and we make an estimate of the structural stability of a nuclear p ower plants in a practical working temperature.
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Inconel 690 합금의 피로균열 발생 및 진전거동에 관한 연구
정한규(Han-Kyu Jeung),권재도(Jae-Do Kwon),우승완(Seung-Wan Woo),이주석(Ju-Seok Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The purpose of this study is to experimentally investigate the fatigue crack initiation and propagation characteristics when nuclear power plant steam generator tube materials, Inconel 690 alloy, receive fretting fatigue. In addition, the study aims to enhance the overall reliability of plant equipments while developing fretting fatigue life and integrity evaluation methods. By using the developed experiment equipment, fretting fatigue crack growth experiments under various stress conditions, were conducted on Inconel 690 alloy to evaluate the characteristics. In addition, the study aimed not only to observe microstructures in accordance with fretting fatigue and contact pressure but also examine fretting fatigue crack initiation mechanism.
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320℃에서의 인코넬 합금의 프레팅 피로 거동 평가에 관한 연구
권재도(Jae-do Kwon),정한규(Han-kyu Jeung),정일섭(IlSup Chung),박대규(Dae-kyu Park),윤동환(Dong-hwan Yoon) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.8
원자력 발전설비의 증기발생기용 세관 재료로 인코넬 합금이 사용되고 있다. 인코넬 합금은 고 니켈과 크롬의 합금으로 고온에서 내부식성이 뛰어난 특성을 가지고 있다. 본 연구에서는 인코넬 600 과 690 합금에 대해 실제 원전의 운전온도, 즉 320℃가 프레팅 피로 거동에 미치는 영향에 대해 연구해 보았다. 그 결과 320℃에서의 단순 피로한도와 프레팅 피로한도가 상온에서의 단순 및 프레팅 피로한도에 비해 다소 저하하는 것을 알 수 있었다. 아울러 하중 반복회수와 마찰력의 변화 특성도 얻었다. 또한 파단면을 전자현미경으로 관찰하여 프레팅 피로기구도 검토해 보았다. 이와 같은 결과는 실제 운전온도에서 프레팅을 받는 증기발생기의 구조건전성 평가에 활용 가능할 것으로 생각된다. Inconel alloys are generally used as steam generator tubes in nuclear power plants. These alloys are highnickel chromium alloys that exhibit excellent resistance to aqueous corrosion. In this paper, the effects of elevated temperatures such as an operating temperature of 320°C on the fretting fatigue behavior of inconel 600 and 690. We observed that the plain and fretting fatigue limits at 320°C were slightly lower than those at room temperature. The frictional forces varied depending on the number of load cycles. After each test, we studied the fretting fatigue mechanisms via SEM observations. These results can be used for structural integrity evaluations at elevated temperatures and for studying fretting damage in steam generator systems.
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LFT-D 시스템을 이용한 탄소 장섬유 열가소성 복합재의 제조 및 인장특성 분석
신유정(Yujeong Shin),정한규(Han-Kyu Jeung),박시우(Si-Woo Park),박동욱(Dong-Wook Park),박열(Yeol Park),정진우(Jin-Woo Jung) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
Carbon-fiber-reinforced plastic (CFRP) composite materials have been widely used in various industrial fields because the design variables can be adjusted according to the application of the required structure. Thermosetting and thermoplastic resins are used as the base materials of CFRP composites for the lightweight construction of automotive components. Thermoplastics have several advantages such as no curing and recyclability compared to thermosetting resin. In this study, CFRP composites were made using the Long-Fiber Thermoplastic-Direct (LFT-D) process. The LFT-D process includes an in-line production system that directly impregnates a thermoplastic resin, extrudes the composite material, and molds it. This process increases the strength and decreases the molding time. The tensile strength characteristics on the mechanical properties of CFRP were analyzed according to the parameters of LFT-D based on thermoplastics. To analyze the properties of CFRP, the specimens were prepared based on the tensile test standard ASTM 3039 of composite materials.
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Tensile Property Analysis of NCF Composite Laminated Structure for HP-CRTM Forming Process
Ki-Seok Byeon(변기석),Yu-Jeong Shin(신유정),Han-Kyu Jeung(정한규),Si-Woo Park(박시우),Chun-Su Roh(노춘수),Jin-Soo Je(제진수),Ki-Chul Kwon(권기철) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.1
In recent years, the HP-CRTM method, which has the ability to produce carbon fiber-reinforce plastic composites at high speeds, has come into the spotlight in the automotive parts industry, which demands high productivity. Multi-axial carbon fabric, an intermediate material used in this HP-CRTM molding process, consists of layered fibers without crimp, which makes it better in terms of tensile and shear strength than the original woven fabrics. The NCF (non-crimp fabric) can form the layers of the carbon fiber, which have different longitudinal and lateral directions, and ±θ degrees, depending on the product’s properties. In this research, preforms were made with carbon fibers of ±45° and 0/90°, which were lamination structures under seven different conditions, in order to create the optimal laminated structure for automobile reinforcement center floor tunnels. Carbon fiber composites were created using each of the seven differently laminated preforms, and polyurethane was used as the base material. The specimens were manufactured in accordance with the ASTM D3039 standards, and the effect of the NCF lamination structure on the mechanical properties was confirmed by a tensile test.
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