• Design & Manufacturing
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• 제6권2호
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• pp.79-83
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• 2012

Inner part is used as an insulator in wire fuses. After injection molding, inner part has been showed flashes, filling defects and deformation. After production, operators have to cut off flashes, one by one. this process leads to continuous low productivity and loss of source materials. This study focuses on identifying the causes for flashes, filling defects, clamping force of injectors, mold adhesion, resin of liquidity and others, and on resolving those issues.

• 한국분말재료학회지
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• 제3권2호
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• pp.104-111
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• 1996

In order to obtain homogeneous and high quality products in powder compaction forging process, it is very important to control stress, strain, density and density distributions. Therefore, it is necessary to understand quantitatively the elasto-plastic deformation and densification behaviors of porous metals and metal powders. In this study, elasto-plastic finite element method using Lee-Kim's pressure dependent porous material yield function has been used for the analysis of three dimensional indenting process. The analysis predicts deformed geometry, stress, strain and density distribution and load. The calculated load is in good agreement with experimental one. The calculated results do not show axisymmetric distributions because of the edge effect. The core part which is in contact with the indentor and the outer diagonal edge part are in compressive stress states and the middle part is in tensile stress state. As a results, it can be concluded that three dimensional analysis is more realistic than axisymmetric assumption approach.

• 소성∙가공
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• 제26권6호
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• pp.372-377
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• 2017

In this paper, an effective design procedure was proposed to design the rib of die structure for auto-body member with ultra-high strength steel (UHSS) having ultimate tensile strength (UTS) of 1.5 GPa. From analysis results of the die structure, structural safety of the die was evaluated with information such as displacement and von-Mises stress. It was concluded that the casting part could be designed in order to reduce tool deformation. A design guideline of the die structure was proposed, especially for the rib structure in the casting part with an optimization scheme and local reinforcement concept. Simulation result following the design guideline fully explained that stability of the tool structure could be obtained simultaneously with weight minimization.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 추계학술대회논문집
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• pp.130-137
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• 1997

During crash of a vehicle a major part of the kinetic energy of the driver is absorbed by a steering system. The deformation characteristics of the steering system has significant effects on the injury of the driver. A part of the energy is absobed by the steering wheel and another part by the collapsable steering column. It is believed that the structure of the steering wheel has an important effect on the injury of the driver. A design criterion is suggested for steering wheels for maximum protection of drivers. Taguchi method is used to obtain the effects design parameters.

• 콘크리트학회논문집
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• 제11권3호
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• pp.3-12
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• 1999

This study presents a suggestion of regulation of skewed slab bridge. In order to find the characteristic behavior of skew bridge, many cases of skew bridges were analyzed with changed angle of skew. The comparison of design methods for cantilever part in pier was also made. It was found that : (1) The lower the skew angle was, the higher the maximum support reaction forces at the end point were. (2) The higher the ratio of L/B was, the higher the maximum support reaction force at the point was. (3) The effect of skew may be neglected for skew angles of $70^{\circ}$or more. (4) If elastic springs are applied to the boundary conditions to simulate the rubber pad bearings, the results will be more reasonable. (5) The shear deformation effect must be considered in the analysis of cantilever part of substructure. (6) Using strut and tie model to design cantilever part of pier, it will be more simple than finite element method with same accuracy and more accurate than using frame element.

• 복식문화연구
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• 제19권3호
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• pp.488-500
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• 2011

[ $D{\'{e}}formation$ ]is one of the most important cultural factor which puts people at ease and gives a sense of security. This study, in the process, analyzes the works of Moschino. Moschino's designs are rated to have approached the sublime when it comes to transforming the psychological anxiety of everyday living into a laughter. After selecting one hundred-two of Moschino's designs from the Internet Web site(www.cft.or.kr, www.samsungdesign.net), this study examines and analyzes the characteristics and types of deformation found in them. The result as follows. The examination of deformation found in Moschino designs can be classified into a transformation, distortion, exaggeration, and illusion. Transformation, a conscious change of the existing form or function, was shown as the change of an existing position, form, function and designation of a new function. Distortion, an interpretation away from the reality or a "wrong interpretation," was shown by placing opposing factors in left-right position as an extreme asymmetry. Exaggeration, always beyond the realm of reality, was shown thorough an enlargement or a magnification of a specific part and a repetition of a detail factors. Illusion, through a distortion of reality results in something that looks new, was expressed through the effects of wearing a two-pieces, an expression of details, effects of wearing accessories, and an expression of a dynamism. Therefore, Moschino has reflected the desire of homo modern to transform the existing situation through many techniques of deformation.

• 지질공학
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• 제21권3호
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• pp.199-212
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• 2011

강원도 삼척시에 위치한 도계 석탄폐석 적치장 주변지반에서 지반변형이 발생되었다. 대상지역에서의 지반변형 원인을 조사하기 위하여 시추조사 및 현장조사를 통한 지반조사와 기존 발간된 지형도를 이용한 지형분석을 실시하였다. 시추조사결과 상부에 토층이 9-28.5 m로 존재하고 있으며, 대상지역에 발생된 주요 균열을 조사한 결과 $240{\sim}250^{\circ}$ 방향으로 지반이 변형되고 있음을 알 수 있다. 또한 기존 발간된 지형도를 이용하여 비교분석한 결과 대상지역에서는 지속적으로 석탄폐석이 적치되었음을 확인 할 수 있다. 지반조사 및 지형분석결과를 토대로 대상지역의 지형변화 원인을 분석한 결과 대상지역에 존재하는 두꺼운 토층이 내적요인이며, 석탄폐석의 지속적인 적치로 인한 하중증가 및 하단부에서의 사면절취가 외적요인으로 나타났다.

• 한국정밀공학회지
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• 제16권4호통권97호
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• pp.57-63
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• 1999

A thin metal plate such as detent spring has the shape deformation due to the phenomenon of spring back after press machining and heat treatment process. This requires the correction of spring shape and force in final inspection process. To do correction of the shape deformation the impact force is manually applied to the bended part of detent spring after measuring the shape deformation and spring force. To develop the automatic spring force correction system, applied force of occurring plastic deformation must be derived from the experimental method. But frequent change of spring shape and material makes it difficult to accomplish the experimental method to be applied. This paper describes the analytical method for detent spring force correction system is to be substituted for the experimental method. FEM(Finite Element Method) is used to find the boundary value between elastic and plastic deformation in the analytical method. To confirm the validity of the analytical method, the result of two methods is compared each other at various applied force conditions. It shows that the simulation result of the analytical method is consistent with the result of the experimental method within the error bound ${\pm}$5%. The result of this paper is useful for development of the automatic spring correction system and reduction of the complicated and tedious processes involved in experimental method.

• Geomechanics and Engineering
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• 제29권1호
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• pp.91-97
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• 2022

The cohesive non-swelling soil (CNS) cushion technology has been widely applied in the subgrade and slope improvement at expansive soil regions. However, the mechanism of the inhibition effect of the CNS layer on expansive soil (ES) has not been fully understood. We performed four outdoor model tests to further understand the inhibition effect, including different kinds of upper layer and thickness, under the unidirectional seepage condition. The swelling deformation, soil pressure, and electrical resistivity were constantly monitored during the saturation process. It is found that when a CNS layer covered the ES layer, the swelling deformation and electrical resistivity of the ES layer decreased significantly, especially the upper part. The inhibition effect of the CNS layer increases with the increase of CNS thickness. The distribution of vertical and lateral soil pressure also changed with the covering of a CNS layer. The electrical resistivity can be an effective index to describe the swelling deformation of ES layer and analyze the inhibition effect of the CNS layer. Overall, the CNS deadweight and the ion migration are the major factors that inhibit the swelling deformation of expansive soil.

• 한국지반공학회논문집
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• 제21권4호
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• pp.99-114
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• 2005

본 연구의 Part I에서는 포화 점성토지반 침하량의 합리적인 평가를 위한 새로운 개념의 응력경로법 적용방법을 제안하였으며, 이러한 새로운 개념의 실용화와 관련하여 포화 점성토지반의 침하관련 특성변형거동을 효율적으로 평가하고 활용하는 구체적인 방법을 개발하였다. 본 Part II에서는 이러한 선행 연구결과를 바탕으로 실제 침하량 평가에 활용가능한 수준의 침하량 평가절차를 개발하였으며, 다양한 예제에 대한 침하량 분석을 통해 그 적용성과 유용성을 확인하였다. 이와 더불어 개발된 평가방법과의 비교를 통해 기존 평가방법들의 한계 또한 명확히 제시하였다. 본 연구에서 개발된 침하량 평가절차는 그 뛰어나고 유연한 적용성으로 인해 향후 여러 관련 시공현장에서 매우 유용하게 활용될 수 있을 것이다. 대표적인 예로, 개발된 평가절차는 특정 구조물에 대해 허용침하량 기준을 만족하도록 다양한 설계대안을 검토하거나 또는 시공과정에서 발생하는 각종 설계변경이 침하량에 미치는 영향을 즉각적으로 평가할 필요가 있는 경우 등에 효과적으로 활용될 수 있으며, 특히 동일한 지반 상에 다양한 구조물이 들어서게 될 대규모 부지에 대한 사전 검토작업에 매우 유용하게 활용될 수 있을 것이다.