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RISS 인기검색어
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- 저자 : 김익겸(Kim lk Gyeom) (검색결과 3 건)
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실측응력 및 시뮬레이션에 의한 트러스 철도교의 피로피해도 분석
정영화(Jung Young Hwa),김익겸(Kim lk Gyeom),김지훈(Kim Ji Hun),김은성(Kim eun sung) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
After measuring actual stress by two measurements(Dynamic Strain Meter, Histogram Recorder)on truss rail road bridge, we could perform time history analysis by 3-D beam element method on modelling bridge. And then,after analyzing bridge structure in static by 3-D modelling, we estimated degree of fatigue damage in main member, secondary member of tie zone,cutting area of base metal cross section for confirming the result. In case that the simulate stress is carried out on medeling bridge, most of those simulation mainly is performed by main members.But in real bridge fatigue damage problems generally caused by junctions, connections, joints in which especially local stress is activated. Therefore, in this paper actual stress on critical area was estimated through the analysis result by simulation. With this study, we can estimate the degree of fatigue damage from a safety point of view and comparative accuracy.
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정영화(Jung Young Hwa),김익겸(Kim lk Gyeom),남왕현(Nam Wang Hyone),장동휘(Chang Dong Huy) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
The 4-point bending tests have been performed in order to estimate the effect of TIG-dressing on fatigue strength and fatigue characteristics quantitatively for nonload-carrying fillet welded joints subjected to pure bending. As a result of fatigue tests, fatigue strengths of as-welded specimens have satisfied the grade of fatigue strength prescribed in specifications of korea, AASHTO and JSSC. Fatigue strength at 2 million cycles of TIG-dressing specimens have increased compared with as-welded specimens. As the result of beachmark tests, fatigue cracks occurred at several points, where the radius of curvature and flank angle in the weld bead toes were low, and grew as semi-elliptical cracks, then approached to fracture, As a result of finite element analysis, stress concentration factor in weld bead toes has closely related to the flank angle and radius of curvature, and between these, the radius of curvature has more largely mechanics approaches, the crack correction factor than flank angle. As a result of fracture mechanics approaches, the crack correction factor of test specimens has largely affected on stress gradient correction factor in case a/t is below 0.4 from the relations between stress intensity factor range estimated from FEM analysis and fatigue crack growth rate, fatigue life has been correctly calculated.
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SM570, POSTEN60 및 80 강재의 피로균열성장특성
정영화(Jeong Young Wha),김익겸(Kim lk Gyeom),강성립(Kang Sung Lib),남왕현(Nam Wang Hyone),김은성(Kim Eun Sung) 강원대학교 산업기술연구소 2001 産業技術硏究 Vol.21 No.1
In this study, a series of fatigue tests are carried out in order to estimate quantitatively the characteristics of fatigue crack growth rate for high strength steels of SM570, POSTEN60, and POSTEN80 steel, that is, the influence on fatigue crack growth rate according to the welding line, the characteristics of fatigue crack growth according to the welding method and the kinds of steel, and the characteristics of fatigue crack growth for base metal, heat affected zone and weld metal. From the test results, in case that the notch if parallel to welding line, it knows that the retardations of fatigue crack growth rate in crack tip at early stage increase remarkably than in case that the notch is perpendicular to welding line due to compressive residual stress. And the characteristics of fatigue crack growth rate according to welding method are that the dispersion of fatigue crack growth rate in case of FCAW method is smaller than that of SAW method. Also, it knows that the fatigue crack growth rate converges in high stress intensity factor range.
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