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한재준,Han, Jae-Jun 대한출판문화협회 1998 출판저널 Vol.244 No.-
활자꼴은 크게 정보전달과 이미지 표현의 역할을 맡고 잇따. 정보전달 중심의 한글꼴은 큰 변화가 없는 편안하고 익숙한 형태를 띠며, 이미지 표현 중심의 글꼴은 예측하기 어려운 다양한 형태를 띤다. 출판물 성격에 따라 쓰임새에 알맞은 절제된 활용의 지혜가 필요하다.
용접부의 크리프 특성 불균일이 응력 재분배에 미치는 영향
한재준(Jae-Jun Han),이국희(Kuk-Hee Lee),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper attempts to quantify the effect of mismatch in creep properties on steady-state stress distributions for two welded components. The straight pipe and the large bore welded branch are chosen for quantification under various loading combinations. The vessel is modeled by only two materials, the base and weld metal. Idealized power law creep laws with the same creep exponents are assumed for base and weld metals. A mismatch factor is introduced, as a function of the creep constant and exponent. Steady-state stress distributions within the weld metal, resulting from three-dimensional, elastic-creep finite element (FE) analyses, are then characterized by the mismatch factor. We can find that average stresses in the weld can be characterized by the mis-match factor. And there is an particular observation to material behavior.
유한요소기반 다중스케일 연성파손모사 기법을 이용한 원주방향 균열이 존재하는 탄소강 실배관 예측 및 검증
한재준(Jae-Jun Han),배경동(Kyung-Dong Bae),김낙현(Nak-Hyun Kim),김윤재(Yun-Jae Kim),김종현(Jong-Hyun Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper describes multi-scale-based ductile fracture simulation via finite element (FE) damage analysis. In structural integrity assessment, although experimental results provide informative mechanical behaviors, reproduction of components is not cost effective, especially for full-scale tests, such as large-scale pipe system in nuclear power plants. In such a situation, virtual tests using FE damage analysis can be an efficient alternative to find fracture behaviors of cracked components. To implement of the virtual tests, stress modified fracture strain model is adopted as damage criterion with modified calibration technique which only requires tensile and fracture toughness test data. Element-size-dependent critical damage model is also introduced to apply proposed ductile fracture simulation to largescale components. To validate proposed method, simulated results are compared with test results of full-scale pipes performed by Battelle memorial institute.
유한요소기반 다중스케일 연성파손모사 기법을 이용한 원주방향 균열이 존재하는 탄소강 실배관의 파손예측 및 검증
한재준(Jae-Jun Han),배경동(Kyung-Dong Bae),김윤재(Yun-Jae Kim),김종현(Jong-Hyun Kim),김낙현(Nak-Hyun Kim) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.7
본 논문은 유한요소 기반 다중스케일 연성파손모사 기법을 이용하여 결함이 존재하는 실배관의 파괴거동을 예측한다. 수정응력 파괴변형률 모델을 손상기준으로 선정하고 유한요소 손상해석을 통해 균열진전을 모사한다. 기준식의 결정에는 인장시험과 파괴인성시험 결과만이 요구되며 온도 288oC SA333 Gr. 6 탄소강에 적용하여 결과를 제시하였다. 요소크기-의존성 임계손상모델을 도입하여 손상해석의 수치해석적인 불안정성을 개선하였다. 본 연구에서 제안하는 가상시험법의 검증을 위해 미국 바텔연구소에서 수행한 실배관 실험결과와 예측결과를 비교한다. This paper describes multi-scale based ductile fracture simulation using finite element (FE) damage analysis. The maximum and crack initiation loads of cracked components were predicted using proposed virtual testing method. To apply the local approach criteria for ductile fracture, stress-modified fracture strain model was adopted as the damage criteria with modified calibration technique that only requires tensile and fracture toughness test data. Element-size-dependent critical damage model is also introduced to apply the proposed ductile fracture simulation to large-scale components. The results of the simulation were compared with those of the tests on SA333 Gr. 6 full-scale pipes at 288oC, performed by the Battelle Memorial Institute.
사형 주조 마그네슘 합금의 인장 특성에 미치는 합금 원소와 결정립 미세화의 영향
한재준 ( Jae Jun Han ),권해욱 ( Hae Wook Kwon ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.4
The effects of alloying element and grain refinement on the tensile properties of magnesium alloy poured into sand mold were investigated. The strength of magnesium alloy was greatly increased by the addition of aluminium and that was increased with the increased aluminum content added up to 8.10 wt% and decreased beyond that. Even though the strength of Mg-8.10 wt%Al alloy was rather decreased by the addition of zinc, that was increased with increased zinc content added up to 0.50 wt% and decreased with the increased one beyond that. The maximum tensile strength was obtained with 0.50 wt%Mn added. The strength and elongation were simultaneously increased with grain refinement and the optimum amount of strontium addition for this was 0.30 wt%. The optimum chemical composition was obtained and the yield strength, tensile strength and elongation of the alloy with this composition were 90.2, 176.3MPa and 4.43%, respectively.
직관 용접부의 크리프 특성 불균일에 따른 열영향부 정상상태 응력 예측
한재준(Jae-Jun Han),김상현(Sang-Hyun Kim),정진택(Jin-Taek Chung),김윤재(Yun Jae Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.3
본 논문은 크리프 파단 수명평가에 주요인자인 정상상태 크리프 응력을 직관 용접부에 대해 정량화한다. 모재와 용접부의 크리프 특성 불균일이 응력에 미치는 영향을 체계적으로 분석하기 위해, 다양한 용접부 불균일에 대해 이차원 유한요소 크리프 탄성해석을 수행하였다. 용접부는 열영향부를 고려하였으며 각각의 재료는 이상화된 탄성-멱 크리프 법칙을 따른다고 가정하였다. 하중에 따른 영향을 보기위해 내압과 인장하중에 대해 연구를 수행하였다. 용접부 크리프 응력의 정량화를 위해 크리프 불균일 지수를 도입하였으며, 무차원화된 단면평균응력과 선형적인 관계를 확인하였다. 불균일 지수로 정량화한 응력과 Type IV 영역을 모사한 용접부의 유한요소해석 결과 및 영국전력의 R5 문헌값의 비교를 통해 연구결과의 유효성을 검증하였다. This paper reports the steady-state stresses within the heat affected zone (HAZ) of a welded straight pipe subject to creep. The creep constants and exponent are varied systematically to see the effect of various mismatches in creep properties on the steady-state creep stresses, via detailed two-dimensional finite element (FE) creep analyses. The weldments consist of the base metal and weld metal with the HAZ, which are characterized using the idealized power creep laws with the same creep exponent. The internal pressure and axial loading are considered to see the effect of the loading mode. To quantify the creep stresses, a creep mismatch factor is introduced as a function of the creep constants and exponent. It is concluded that the ratio of the section-averaged stresses for a mismatched case to those for an evenmatched case are linearly dependent on the mismatch factor. The results are compared with the FE results, including the Type IV region, as well as the R5 procedure.
감육이 존재하고 내압과 굽힘하중의 복합하중을 받는 T 분기관의 한계하중
한재준(Jae-Jun Han),이국희(Kuk-Hee Lee),김윤재(Yun-Jae Kim),이성호(Sung-Ho Lee),박치용(Chi-Yong Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper presents plastic limit loads of piping branch junctions with local wall thinning under combined pressure and in-plane bending, based on systematic three-dimensional finite element limit analyses using elastic-perfectly plastic materials. An ideal branch junction without weld or reinforcement around the intersection is considered with two locations of wall thinning; one in the run pipe, and the other in the branch pipe. Based on FE results, effects of thinning geometries on plastic limit moments are quantified and simple approximations of plastic limit loads are proposed.