• Title/Summary/Keyword: Forming effects

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Crash Analysis of the ULSAB-AVC Model with Considering Forming Effects (박판성형가공을 고려한 자동차 충돌해석)

  • Huh, H.;Yoon, J.H.;Bao, Y.D.;Kim, S.H.;Park, S.H.
    • Transactions of Materials Processing
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    • v.15 no.8 s.89
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    • pp.556-561
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    • 2006
  • Most of auto-body members are composed of stamping parts. These parts have the non-uniform thickness and plastic work hardening distribution during the forming process. This paper is concerned with the side impact analysis of the ULSAB-AVC model according to the US-SINCAP in order to compare the crashworthiness between the model with and without considering the forming effect. The forming effect is ca]ciliated by one-step forming analysis for several members. The crashworthiness is investigated by comparing the deformed shape of the cabin room the energy absorption characteristics and the intrusion velocity of a car. The result of the crash analysis demonstrates that the crash mode, the load-carrying capacity and energy absorption can be affected by the forming effect. It is noted that the design of an autobody should be carried out considering the forming effect for accurate assessment of crashworthiness.

Study on Design Parameters that Affect the Forming Force of the Magnetic Pulse Forming Device (자기 펄스 성형장치의 성형력에 영향을 미치는 설계 파라미터에 관한 연구)

  • Lee, Man Gi;Yi, Hwa Cho;Kim, Jin Ho
    • Journal of the Korean Magnetics Society
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    • v.25 no.3
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    • pp.79-82
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    • 2015
  • The design parameter study about the magnetic pulse forming is performed using finite element analysis with MAXWELL. The first case of design parameters is about the initial charging voltage and the capacitance and the second case of design parameters are about the winding turns and the spacing of electromagnetic coil. The 3D finite element model of electromagnetic forming system is created and the magnetic force is calculated. The effects of design parameters on the magnetic forming force are investigated.

Optimized mix design of rapid-set lightweight-formed mortar for backfill (굴착복구용 속경성 경량기포 시멘트 모르타르의 최적 배합 도출을 위한 기초 물성 연구)

  • An, Ji-Hwan;Jeon, Sung-il
    • International Journal of Highway Engineering
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    • v.19 no.1
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    • pp.1-9
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    • 2017
  • PURPOSES : The objective of this study is to develop an optimized method of mix design for rapid-set lightweight-formed mortar mix. To achieve this objective, the workability, setting time, and compressive strength of mixes under various conditions of mix design were evaluated. METHODS : The water-bonder ratio, fly-ash substitution ratio, and forming agent injection amount were selected as design variables in the study. The fluidity, setting time, density, and strength of the mortar mix were considered as major evaluation criteria of the mixture, and were subsequently utilized to evaluate the characteristics of the mortar mix under various conditions. RESULTS : The observations made from the mix design process are as follows: 1) the air content and fluidity increase as the forming agent ratio and forming agent ratio increase, respectively; 2) the maximum air content is approximately 20%; 3) the accelerating agent decreases the fluidity of the mortar mix by 15% on average; 4) the forming agent injection ratio and fly-ash substitution ratio yield significant effects on the initial and final set times of the mortar mix; 5) as the forming agent injection ratio and fly-ash substitution ratio increase, the compressive strength of the mortar mix decreases; and 6) the 28-day compressive strengths of the forming agent injection ratio and fly-ash substitution ratio yield the most significant effects. CONCLUSIONS : It is concluded that the governing design variables for the rapid-set lightweight-formed mortar mix are the forming agent injection ratio and fly-ash substitution ratio.

Effects of Squalene on the Immune Responses in Mice(II):Cellular and Non-specific Immune Response and Antitumor Activity of Squalene

  • Ahn, Young-Keun;Kim, Joung-Hoon
    • Archives of Pharmacal Research
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    • v.15 no.1
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    • pp.20-29
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    • 1992
  • Effects of squalene on cellular and non-specific immune responses and antitumor activity in mice were investigated. Cellular and non-specific immunological assay parameters adopted in the present study were delayed-type hypersensitivity reaction and resette forming cells (RFC) for cellular immunity, activities of natural killer (NK) cells and phagocyte for non-specific immunity. Squalene resulted in marked increases of cellular and non-specific immune functions and enhancement of host resistance to tumor challenge in dose-dependent manner.

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Effects of Squalene on the Immune Responses in Mice(I): Humoral Immune Responses of Squalene

  • Ahn, Young-Keun;Kim, Joung-Hoon
    • Archives of Pharmacal Research
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    • v.14 no.4
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    • pp.370-378
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    • 1991
  • Effects of squalene on humoral immune system in mice were investigated. Squalene exhibited significant increases in the circulating leukocyte counts and relative spleen and thymus weights of the mice. However, the relative liver weight was slightly decreased. Hemagglutination titers (HA) were signficantly enhanced by squalene while Arthus reaction was not affected. Splenic plaque forming cells (PFC) were also greatly increased by squalene, especially at doses of 50 and 100 mg/kg of it.

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Effect of Forming Factor on Springback in U-bended and Drawn Channel (굽힘과 드로잉에서 성형인자가 탄성복원에 미치는 영향)

  • 한영호;송윤준;김형진;정영혁
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.05a
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    • pp.90-93
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    • 2002
  • Assuring required dimensional tolerance after spingback becomes the main concern of sheet-forming die designers when formability is secured through previous tryout. As a part to build a guideline to control springback in automobile frame forming, experiments are carried out to show the effects of process parameters, such as holding force, blank size, and lubrication, on corner angles of channels formed by U-bending or by square-cup drawing and trimming. The results are resented in the viewpoint of evaluating parameters.

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Development of Manufacturing Technology for Center Floor Cross Member with Roll Forming Process (롤 포밍 공법을 이용한 고강도 차체 부품 제작 기술 개발)

  • Kim, D.K.;Park, S.E.;Cho, K.R.;Lee, K.H.;Kim, K.H.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.10a
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    • pp.297-300
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    • 2009
  • The roll forming process is often used to manufacture long, thin-walled products such as a pipe. The final cross-section is a comparatively simple open-channel, a closed tube section or a complex profile with several bends. In recent years, that process is often applied to the bumper beam in the automotive industries. In this study, a optimal Center Floor Cross Member manufacturing technology, model deign and proper roll-pass sequences can be suggested by forming number of roll-pass and bending angle, and also effects of the process parameters on the final shape formed by roll forming defects were evaluated.

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The Study of Manufacturing Technology for Front Side Member Lower (고강도 차체부품 제작 기술에 대한 연구)

  • Park, S.E.;Kim, D.K.;Lee, Y.J.;Kim, K.H.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.10a
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    • pp.293-296
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    • 2009
  • In roll forming process, a sheet metal is continuously progressively formed into a product with required cross-section and longitudinal shape, such as a circular tube with required diameter, wall-thickness and straightness, by passing through a series of forming rolls in arranged in tandem. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal front side member manufacturing technology, model deign and proper roll-pass sequences can be suggested by forming number of roll-pass and bending angle. And also effects of the process parameters on the final shape formed by roll forming defects were evaluated.

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A Study on the Forming Characteristics of Radial-Forward Extrusion Process (레이디얼-전방압출 공정의 성형특성에 관한 연구)

  • 황승규;이호용;황병복
    • Transactions of Materials Processing
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    • v.11 no.1
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    • pp.84-89
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    • 2002
  • This study is concerned with the analysis of the forming characteristics of radial-forward extrusion. Angle between radial and forward extrusion, gap height, and friction factor are considered as important design factors to affect forming characteristics in radial-forward extrusion. The rigid-plastic finite element method is adopted to analyze the effects of design factors on forming loads. The incremental rates of loads are nearly constant except the deformation zone from radial to forward extrusion. The smaller angle induces lesser force increment, therefore forming load increases as the angle increases. Maximum load also increases as gap-height decreases and friction factor increases.

Forming Gas Post Metallization Annealing of Recessed AlGaN/GaN-on-Si MOSHFET

  • Lee, Jung-Yeon;Park, Bong-Ryeol;Lee, Jae-Gil;Lim, Jongtae;Cha, Ho-Young
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.15 no.1
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    • pp.16-21
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    • 2015
  • In this study, the effects of forming gas post metallization annealing (PMA) on recessed AlGaN/GaN-on-Si MOSHFET were investigated. The device employed an ICPCVD $SiO_2$ film as a gate oxide layer on which a Ni/Au gate was evaporated. The PMA process was carried out at $350^{\circ}C$ in forming gas ambient. It was found that the device instability was improved with significant reduction in interface trap density by forming gas PMA.