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논문 : AISI 316L스테인리스강의 소형펀치 크리프 거동에 미치는 마찰계수의 영향
김범준 ( Bum Joon Kim ),조남혁 ( Nam Hyuck Cho ),김문기 ( Moon K. Kim ),임병수 ( Byeong Soo Lim ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
Small punch creep testing has received attention due to the convenience of using smaller specimens than those of conventional uniaxial creep tests, which enables creep testing on developing or currently operational components. However, precedent studies have shown that it is necessary to consider friction between the punch and specimen when computing uniaxial equivalent stress from a finite element model. In this study, small punch creep behaviors of AISI 316L stainless steel, which is widely used in high temperature-high pressure machineries, have been compared for the two different ceramic balls such as Si3N4 and Al2O3. The optimal range of the friction coefficient is 0.4~0.5 at 650℃ for the best fit between experimental and simulation data of AISI 316 L stainless steel. The higher the friction coefficient, the longer the creep rupture time is. Therefore, the type of ceramic ball used must be specified for standardization of small punch creep testing.
P122강 열화재의 소형펀치 크리프 평가 및 미세조직 분석
김범준 ( Bum Joon Kim ),김문기 ( Moon K Kim ),임병수 ( Byeong Soo Lim ),Hoang Tien Dung 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.1
This paper investigates the influence of aging time on creep properties via a small punch creep test and evaluates the microstructural change of P122 steel at 600℃. The area fraction of precipitates was quantitatively analyzed to identify the relationship between the creep rupture life and precipitates. The coarsening behavior of precipitates along the grain boundaries was also investigated for various aging times. It is found that this coarsening behavior led to a loss of solution hardening and resulted in a hardness drop and a reduction of creep life.
Chang-Bum Moon,K Furuno,T Komatsubara 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
The excited states of the $^{115}$I nucleus have been studied by using in-beam $\gamma$-ray spectroscopy with the $^{89}$Y ($^{29}$Si, 3n) $^{115}$I reaction at a beam energy of 108 MeV. The level scheme of $^{115}$I was established by using $\gamma-\gamma$ coincidence and $\gamma-\gamma$ angular correlation analysis. In the present work, many collective bands built on the proton h$_{11/2}$, g$_{7/2}$, and d$_{5/2}$ were observed. Among them, an unfavored rotational band and a quasi-$\gamma$ band based on the $\pi$h$_{11/2}$ configuration was newly identified. A well-developed rotational band built on the 7/2$^+$ level was established up to I$^{\pi}$ = 47/2$^+$. This positive-collective band could be interpreted as coming from the $\pi$g$_{7/2}$ configuration at low spins. At higher spins above I$^{\pi}$ = 23/2$^+$, that band was found to be associated with the aligned three-quasiparticle configuration built on a proton in the g$_{7/2}$ orbital coupled to a pair of neutrons in the h$_{11/2}$ orbital.
Microstructure Study of Electrochemically Driven LixSi
Son, Seoung-Bum,Trevey, James E.,Roh, Hyunchul,Kim, Sung-Hwan,Kim, Kee-Bum,Cho, Jong Soo,Moon, Jeong-Tak,DeLuca, Christopher M.,Maute, Kurt K.,Dunn, Martin L.,Han, Heung Nam,Oh, Kyu Hwan,Lee, Se-Hee Wiley (John WileySons) 2011 Advanced energy materials Vol.1 No.6
임지우 ( Ji Woo Im ),김범준 ( Bum Joon Kim ),김문기 ( Moon K Kim ),임병수 ( Byeong Soo Lim ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.11
The small punch creep (SPC) test has recently received much attention as a new alternative to the conventional uniaxial creep test because it needs only a miniature-sized specimen directly detached from an operating system or component without any serious sampling damages. However, it is difficult to obtain the equivalent uniaxial creep data directly from the SPC data. As a specimen is deformed by a punch in the SPC test, the test result is sensitive to the friction between them. Finite element analyses with various friction coefficients was performed and showed a tendency of increased SPC life with an increased friction coefficient. The necking position predicted by the SPC simulation with a proper friction coefficient showed good agreement with that observed from the real SPC test. Finally, a noble method to convert the SPC load and displacement rate into the equivalent uniaxial creep stress and strain rate, respectively, was established in this study.
Review of 67 Patients With Autoimmune Pancreatitis in Korea: A Multicenter Nationwide Study
Ryu, Ji Kon,Chung, Jae Bock,Park, Seung Woo,Lee, Jong Kyun,Lee, Kyu Tack,Lee, Woo Jin,Moon, Jong Ho,Cho, Kwang Bum,Kang, Dae Whan,Hwang, Jin-Hyeok,Yoo, Kyo-Sang,Yoo, Byung Moo,Lee, Don Hang,Kim, Hae K Lippincott Williams Wilkins, Inc. 2008 Pancreas Vol.37 No.4
OBJECTIVES:: The ideal diagnostic criteria of autoimmune pancreatitis (AIP) are still challenging. Therefore, we investigated the clinical features of AIP in Korea and assessed the clinical use of new Korean diagnostic criteria. METHODS:: We reviewed 67 patients with AIP enrolled in 16 hospitals via a multicenter study. The diagnosis was confirmed according to the Korean diagnostic criteria that included pancreatic imaging, laboratory findings, histopathology, and response to steroid. RESULTS:: Mean age of the patients was 56 years, and 73% were men. Obstructive jaundice (52%) was the most common symptom, and 14 patients (21%) had other organ involvement. Fifty-four patients (81%) revealed diffuse swelling of the pancreas. Either immunoglobulin (Ig)G or IgG4 was elevated in 76%. According to the Korean criteria, 65 patients had definite diagnostic criteria, and 2 patients had probable criteria. Fifteen patients were fulfilled with image, serological, and histopathologic criteria, and 4 patients could be diagnosed with image and steroid responsiveness. Ten patients experienced recurrent attacks of AIP during the mean 20-month follow-up. CONCLUSIONS:: Among 67 cases of AIP, either IgG or IgG4 was elevated in 76% of patients, and 14 patients (21%) had other organ involvement. New Korean diagnostic criteria are useful for diagnosis of AIP.