• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1998년도 제2회 박판성형심포지엄 논문집 박판성형기술의 현재와 미래
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• pp.148-155
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• 1998

A trapexoidal cup of corner angles, 72。 and 102。 has been drawn to 45mm in depth. Strains on the corner flange with an acute corner angle have been compared with those on the corner flange of a square cup and those on the corner flange with an obtuse corner angle respectively. The result has shown that the strains of an acute corner angle have been relieved more than those of a square cup in case of the same conditions except of the corner angles.

• 한국지반신소재학회논문집
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• 제21권2호
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• pp.39-48
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• 2022

사보강버팀보는 수평버팀보와 달리 토압이 발생할 경우 설치각에 의한 휨거동이 발생하기 때문에 버팀보의 축강성만이 요구되는 탄소성해석으로는 그 적용에 대한 한계가 존재한다. 따라서, 본 연구에서는 탄소성해석시의 사보강버팀보에 대한 해석방안을 제시하기 위하여 축강성데이터를 수정하는 방안으로의 접근을 시도하였으며, 이를 위하여 선형탄성해석을 이용하였다. 그리고, 선형탄성해석을 통하여 실제현장에 설치된 사보강버팀보에 대한 축강성데이터를 산정하였다. 산정한 사보강버팀보의 축강성데이터는 탄소성해석에 적용하여 흙막이벽체의 거동을 확인하였으며, 이를 계측결과 및 유한요소해석결과와 비교하여 그 적용성을 평가하였다. 연구 결과 선형탄성해석을 이용하여 사보강버팀보의 축강성데이터를 적용한 경우(Case 1, Case 3)는 버팀보의 축강성을 적용하는 일반적인 방법(Case 2, Case 4)에 비하여 축강성데이터는 9~17% 수준으로 감소하였으며, 탄소성 해석시의 흙막이벽체의 변위는 25.33%~64.42%로 증가하였다. 이 결과를 계측결과와 비교한바 선형탄성해석을 활용한 경우(Case 1, Case 3)는 탄소성해석시의 흙막이벽체 거동을 더욱 잘 나타내었다.

• 한국자동차공학회논문집
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• 제11권6호
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• pp.141-146
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• 2003

This paper calculates the elapsed time to go down a straight as a function of the corner exit speed and considers air resistance, rolling resistance, and slope resistance to figure out the force for forward acceleration. In a car racing, the most critical comer in a course is the one before the longest straight. A driver can lose a quite amount of time by taking a bad line in a corner. Taking a bad line also causes poor comer exit speed which in turn costs more elapsed time to go down a straight. The results are not so dramatic as in the case of cornering but are showing why one should take the correct corner racing line to get the maximum exit speed. Also, for the case of drag race, the elapsed time to go 1/4 mile is calculated.

• 한국산학기술학회논문지
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• 제16권8호
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• pp.5051-5059
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• 2015

농업용 트랙터 프론트 로더의 낙하정지시험, 코너당김시험, 코너충돌시험의 세 가지 충격시험 조건에 대하여 강체동해석, 과도구조해석, 정적구조해석 등을 수행하여 각 부품의 응력분포를 구하고 안전성을 평가하였다. 낙하정지시험은 프론트 로더를 최대높이에서 시작하여 세 단계로 나누어 낙하시킨 후 정지시켜서 충격을 가하는 경우를 해석하였다. 코너당김시험은 체인으로 버켓 밑면의 모서리를 지면에 구속한 상태에서 프론트 로더를 갑자기 상승시키는 경우를 해석하였다. 코너충돌시험은 주행 중에 버켓의 모서리가 충격장애물과 충돌하는 경우를 해석하였다. 세 가지 충격시험 조건에 대한 해석 결과, 모두 마운트의 사각관 모서리와 마운트의 양쪽 꺾임 위치에서 국부적 응력집중이 발생하였다. 이러한 결과를 바탕으로 새로운 프론트 로더의 설계 및 수정 시 파단에 관한 안전성을 개선하는데 도움이 될 것으로 기대된다.

• Journal of Advanced Marine Engineering and Technology
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• 제8권1호
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• pp.49-63
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• 1984

The 5086-H116 Al-Alloy plate specimens having an edge through-thickness notch were investigated to find out the characteristics of the corner crack propagation by the plane bending fatigue. The experiments were also carried out in order to clarify the change of the corner crack propagation behaviour due to the various materials and their thicknesses. In addition, the retardation effect of overload on the corner crack propagation was quantatively studied. Main results obtained are as follows; 1. In the case of estimating the crack propagation rate of the corner crack, it is more reasonable to consider the growth rate of fracture surface area than that of crack length. 2. The shape of the corner crack growing in the plane plate under the bending fatigue can be estimated. 3. The crack propagation rate increases with the increasing of the thickness and the decreasing of the Young's modulus of materials. 4. Regardless of a thickness and kind of materials of specimen, the characteristics of the corner crack propagation can be concluded. 5. The retardation effect of overload is distinct in the corner crack propagation.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 압출 및 인발 심포지엄
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• pp.56-59
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• 1999

In the present study, in order to investigate the effect of the corner filling in the drawing of the rectangular rod from a round bar, the drawing of the square rod from a round bar has been simulated by using rigid-plastic finite element method and artificial neural network has been introduced to reduce the number of simulation. The experimental investigation has been also implemented to verify the efficiency of the application of results of present and previous study. According to the results of present and pervious study, the combination of semi-die angle gives a great effect on the corner filling in case of the irregular shaped drawing process, but, in case of the regular shaped drawing process, the main process variable on the corner filling is reduction in area.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.347-354
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• 2001

In this study, 3-D FEM analysis are carried out to investigate the effect of the corners and re-entrant corners which can't be analysed by 2-D analysis. The excavation shape is re-entrant type conditions. The wall displacement, earth pressure and effectiveness of the corner struts are investigated in the re-entrant case, The 3D analysis are peformed to evaluate the effect of various factors, such as re-entrant corner size, excavation depth, and presence of struts. The wall displacement and earth pressures are influenced the size of re-entrant corner. Therefore, the effect of re-entrant corner should be considered in the evaluation of the earth pressure and displacement of the corners. Finally, strut-support systems are not effective at the re-entrant corner.

• 한국정밀공학회지
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• 제17권6호
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• pp.143-152
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• 2000

The comer filling in shaped drawing process is an important characteristic, unlike the round drawing. It has also influence on the dimensional accuracy of the product. In this study, therefore, the shaped drawing process has been simulated by the three dimensional rigid-plastic finite element method in order to investigate the effect of process variables such as reduction in area and semi-die angle to the corner filling. The artificial neural network has also been introduced to reduce the number of simulations. To verify the results of simulations, experiments have been performed on the real industrial products. According to the results, the main process variable on the corner filling is the combination of semi-die angle in the irregular shaped drawing processes, but in the case of regular shaped drawing processes, reduction in area has great influence on the corner filling.

• Journal of Advanced Marine Engineering and Technology
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• 제32권1호
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• pp.94-99
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• 2008

The characteristics of the flowfield of a square prism having fences on the corner was investigated by the PIV. Strouhal numbers, velocity vectors and velocity profiles around the square prism were observed at various positions of the fences, and Reynolds number of $Re=0.6{\times}10^4{\sim}1.0{\times}10^4$. As the results in case of the prism having fences the Strouhal numbers were all smaller than in case of the prototype prism. In case of the prism having vertical fences on the front corners the concentrated intensity of the vorticity was the strongest and the size of separated shear layer was the largest. While in case of the prism having vertical fences on the rear corners the concentrated intensity of the vorticity was the weakest and the size of separated shear layer was the smallest. Also in this case, the flow separated in front corner was reattached around the rear corner and made circulation.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 가을 학술발표회 논문집
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• pp.329-336
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• 2001

The numbers of geogrid-reinforced walls are widely used in Korea. This papers present the results of two failure case histories of geogrid-reinforced segmental retaining walls. The geological background of the construction sites, detailed construction sequences, and the amount of rainfall were examined. The failure of these reinforced walls are caused by the improper drainage system and foundation treatment, too sharpened curvature of corner work, and too high height of wall.