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직류전위차법을 이용한 랜덤하중하의 피로균열 진전율에 대한 신뢰성 공학적 연구
배성인,Bae, Sung-In 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.2
Automatic fatigue crack length measuring system using DC electrical potential method and the system control program for automatic fatigue testing under random load condition were made in this study. And using these system and control program, fatigue tests were executed under constant and random load condition. As the result, the propagation of crack in random loading can be represented Paris equaiton and log normal probability function. But constant and random load test show different crack propagation properties.
김석,배성인,송정일,Kim, Seok,Bae, Sung-In,Song, Jung-Il 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
Partial penetration welding Joint defines that groove welds without steel backing, welded from on side, and groove weeds welded from both sides but without back gouging, that is. it has an unwelded portion at the root of the weld. In this study we analysed fur residual stress and displacement distribution on partial penetration welding condition of thick plate metal. For 25.4mm thick plate, theoretical residual stress and displacement analysis by finite element method using ABAQUS was carried out and compared with the experimental result using hole-drilling method. In results of the condition of partial penetration, it appeared that longitudinal stress at welding area was a little difference and transverse stress did not have any effect by partial penetration multi-pass welding. From a point of welding distortion in partial penetration multi-pass welding, it seemed to be better to control root face smaller than 6.35mm.
김석,심용래,배성인,송정일,Kim, Seok,Shim, Yong-Lae,Bae, Sung-In,Song, Jung-Il 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.6
Partial penetration welding joint defines the groove welds that applies the one side welding which does not use steel backing and both side welding without back gouging, that is, the partial penetration welding joint leaves an unwelded portion at the root of the welding area. In this study, we analyzed the residual stress and fracture on the thick metal plates that introduced the partial penetration welding method. As results of using above mentioned welding method, we could draw a conclusion that longitudinal stress and traverse stress occurred around the welding area was so minimal and did not affect any influence. We also performed the fracture behavior evaluation on the partial penetration multi-pass welding with 25.4mm thick plate by using theJ-integral, which finally led us the conclusion that the partial penetration multi -pass welding method is more applicable and effective in handling the root face with less than 6.35mm.
Ĵ-적분을 이용한 후판 부분용입 다층용접재의 파괴 해석
김석(Seok Kim),함경춘,배성인(Sung In Bae),송정일(Jung Il Song) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Partial penetration welding joint defines that groove welds without steel backing, welded from one side, and groove welds welded from both sides but without back gouging, that is, it has an unwelded portion at the root of the weld. Study of partial penetration weldment fracture behavior includes residual stress analysis, and fracture analysis. The J-integral loses its path independency in residual stress field. Therefore, it is necessary new J-integral,?, which is considered the effect of plastic deformation and thermal strain. In this study, theoretical formulation and program were developed for the evaluation of ?-integral at the crack tip of weldment. Evaluations of fracture behavior were performed for partial penetration multi-pass weldment of 25.4mm thick plate by ?-integral. From a point of fracture in partial penetration multi-pass welding, it seemed to be better to control root face smaller than 6.35mm.
김석(Seok Kim),배성인(Sung In Bae),송정일(Jung Il Song) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Partial penetration welding joint define that groove welds without steel .backing, welded from on side, and groove welds welded from both sides but without back gouging, that is, it has an unwelded portion at the root of the weld. In this study we analysed for residual stress and displacement distribution on partial penetration welding condition of thick plate metal. For one inch thick plate, theoretical residual stress and displacement analysis by finite element method using ABAQUS was carried out and compared with the experimental result using hole-drilling method. In results of the condition of partial penetration, it appeared that longitudinal stress at welding area was a little difference and transverse stress did not have any effect by partial penetration multi-pass welding. From a point of welding distortion in partial penetration multi-pass welding, it seemed to be better to control root face smaller than 1/4 inch.
김재규(Jae-gyu Kim),김성훈(Sung-hoon Kim),배성인(Sung-in Bae),함경춘(kyung-chun Ham),송정일(Jung-il Song) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Hybrid metal matrix composites used in machines and structures need acceptable data of fatigue life. In real application, machines and structures are subjected to random load histories rather than regular-periodic load histories. Therefore, the fatigue life estimation under irregular-periodic load is necessary for the stability evaluation of machinery. This research makes comparisons of empirical fatigue-lives between AC8A Al alloy and the metal matrix composites(Al/A1₂/O₃/Al₂O₃p) and also includes comparisons of fatigue-lives between empirical fatigue-lives and estimated fatigue-lives from<br/> regular-periodic load. .<br/> According to the test result, the fatigue life of the hybrid metal matrix composites and the metal matrix composites, which are more brittle than the base matrix was shorter than that of the bast matrix under both types of loads. In addition, the fatigue-life estimated from the damage summation method and that from experiment at random load were fairly identical that the theoretical method of fatigue life estimation could be applied to the metal matrix composites.
김진우 ( Jin Woo Kim ),원천 ( Cheon Won ),이동우 ( Dong Woo Lee ),김병선 ( Byung Sun Kim ),배성인 ( Sung In Bae ),송정일 ( Jung Il Song ) 한국복합재료학회 2013 Composites research Vol.26 No.2
본 연구는 동일한 코어재를 가지는 알루미늄과 유리섬유의 하니컴 샌드위치 판넬의 저속 충격시 발생하는 충격 거동 및 압축 실험을 통하여 압축 강도와 압축 계수를 살펴본다. 저속 충격을 받는 하니컴의 충격 거동을 살펴보기 위하여 중량 낙하식 충격 시험을 실시하며, 충격을 가한 후 데이터 분석 및 현미경을 통하여 전형적인 충격파손모드와 손상정도를 비교 평가하였다. 동일한 충격에너지일 때 유리섬유 하니컴 샌드위치 판넬이 알루미늄 하니컴 샌드위치 판넬보다 최대 하중이 높고, 탄성 에너지가 크며, 충격 강도가 높은 것을 확인할 수 있었다. In this study, impact behavior of aluminium and glass-fiber structure is studied under low impact velocity. Compression test is carried out to investigate the compressive strength of the specimens. The degree of damage is observed using microscopy and compared with the experimental analysis data. The maximum load capacity, impact strength and elastic energy of glass-fiber honeycomb sandwich panel are more than the aluminium honeycomb sandwich panel.
배성인,최병익,이학주,김정훈 國立 昌原大學校 産業技術硏究所 1993 産技硏論文集 Vol.7 No.-
Fatigue crack growth tests were conducted on 26 CT specimens of 7075 Aluminum alloy under identical loading conditions of constant amplitude loads. Fatigue crack propagation law, da/dN=C(△K)m was applied to each specimen and the statical characteristics of C and m among specimen were studied. As results, m follows a normal distribution and C follows a log-normal distribution approximately and strong negative linear correlation on the semi-log axes exists between m and log C, so it can be expressed as C=A*Bm . The average of m is 2.729, the standard deviation is 0.27 and the coefficient of variation is 0.099. The average of log C is -14.93. the standard deviation is 0.618, and the coefficient of variation is 0.041. The Fatigue crack propagation life N from certain crack length a1 to a2 follows a log-normal distribution approximately. And the coefficient of variation of N was about 0.15