• Title/Summary/Keyword: Side member

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A Study on the Static Collapse Characteristics of CFRP Side Member for Vehicle (차체구조용 CFRP 사이드부재의 정적 압궤특성에 관한 연구)

  • Lee, Kil-Sung;Yang, In-Young
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.11a
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    • pp.83-86
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    • 2005
  • The front-end side members of automobiles, such as the hat-shaped section member, absorb most of the energy during the front-end collision. The side members absorb more energy in collision if they have higher strength and stiffness, and stable folding capacity (local buckling). Using the above characteristics on energy absorption, vehicle should be designed light-weight to improve fuel combustion ratio and reduce exhaust gas. Because of their specific strength and stiffness, CFRP are currently being considered for many structural (aerospace vehicle, automobiles, trains and ships) applications due to their potential for reducing structural weight. Although CFRP members exhibit collapse modes that are significantly different from the collapse modes of metallic materials, numerous studies have shown that CFRP members can be efficient energy absorbing materials. In this study, the CFRP side members were manufactured using a uni-directional prepreg sheet of carbon/Epoxy and axial static collapse tests were performed for the members. The collapse mode and the energy absorption capability of the members were analyzed under the static load.

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Determination of Position for Reinforcement Blank at Simultaneous Forming Analysis of Automotive Front Side Member (자동차용 프론트 사이드 멤버의 일체복합성형해석 및 보강판재의 위치결정)

  • Yoon, S.J.;Kim, H.Y.;Kim, K.H.;Kim, J.J.;Song, J.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.178-182
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    • 2008
  • Automotive manufacturers lay their eyes on the new manufacturing technologies because of the strengthened competition. Among them, a simultaneous forming is one of the innovative forming technologies to be able to reduce production time and cost. Several parts can be simultaneous manufactured by process, while the conventional stamping demands the same number of die sets with the number of parts. In this study, the automotive front side member was manufactured by the simultaneous forming. The position and the size of initial blank were determined by forming analysis and try-outs, and the blank movement during the forming was controlled by introducing the pilot pin.

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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 Process of Automobile Center floor Side Member using Ultra High Strength Steel of 980MPa (980MPa급 초고강도강판을 이용한 센터 플로 사이드 멤버의 성형공정 연구)

  • Lim, H.T.;Suh, C.H.;Youn, K.T.;Ro, H.C.;Shin, H.D.;Kwak, Y.S.;Park, C.D.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.203-206
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    • 2009
  • Ultra high strength steels(UHSS) are widely used to fill the needs of lightweight part for automobile, and the control of springback is very important (actor in sheet metal forming using UHSS. In this study, to lighten the center floor side member(CFSM) which is normally manufactured using $600{\sim}800MPa$ steel sheet, new design of the manufacturing process for CFSM using APFC980 has been proposed. To accomplish this goal, the influence of process variables such as die corner radius and die wall angle on the springback were investigated using FE-analysis. In order to insure the validity of FE-analysis, the springback results of FE-analysis was verified with prototype product.

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Determination of Shape and Position for Reinforcement Blank at Simultaneous Forming of Automotive Side Member (자동차용 사이드 멤버 일체복합성형시 보강판재의 형상 및 위치 결정)

  • Kim, H.Y.;Hwang, S.H.;Kim, K.H.;Yun, J.J.;Song, J.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.10a
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    • pp.223-227
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    • 2007
  • New forming technologies are being introduced to automotive manufacturing processes. Among them, a simultaneous forming is one of the innovative forming technologies to be able to reduce production time and cost. Several parts can be simultaneously manufactured by the process, while the conventional stamping demands the same number of die sets with the number of parts. In this study, the automotive rear floor side member was manufactured by the simultaneous forming. The position and the size of initial blank were determined by forming analyses and try-outs, and the blank movement during the forming was controlled by introducing the spotweld.

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A Development Auto Inspection System for Prevent an Omission of Motor Body Units (차체 부품 누락 방지를 위한 자동검사 시스템 개발)

  • 이용중;이형우;김기대
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.146-148
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    • 2002
  • An automatic inspection vision systems whose development was the industry applications motor rear side member. This system are connected to the 9 ea camera fur the process inspection the bolt, nuts, units in the rear side member product. This automatic inspection vision systems can perform inspection of not attached the bolt, nuts, units, etc fast and accuracy in react time fashion. And then perform very sophisticated inspection which human workers can not perform.

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Impact of piezocision on orthodontic tooth movement

  • Papadopoulos, Nikolaos;Beindorff, Nicola;Hoffmann, Stefan;Jost-Brinkmann, Paul-Georg;Prager, Thomas Michael
    • The korean journal of orthodontics
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    • v.51 no.6
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    • pp.366-374
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    • 2021
  • Objective: This study investigated the impact of a single piezocision in the maxillary alveolar process on the speed of tooth movement. The null hypothesis was that the speed of tooth movement will be equal with and without piezocision. Methods: All maxillary molars on one side were moved against the combined incisors in 10 ten-week-old male Wistar rats. Under general anesthesia, a force of 25 cN was applied on either side using a Sentalloy closed coil spring. After placing the orthodontic appliance, vertical corticision was performed using a piezotome under local anesthesia, 2 mm mesial from the mesial root of the first molar on a randomly selected side; the other side served as the control. At the beginning of the treatment, and 2 and 4 weeks later, skull micro-computed tomography was performed. After image reconstruction, the distance between the mesial root of the first molar and the incisive canal, and the length of the mesial root of the first maxillary molar were measured. Moreover, the root resorption score was determined as described by Lu et al. Results: Significantly higher speed of tooth movement was observed on the corticision side; thus, the null hypothesis was rejected. The loss of root length and root resorption score were significantly more pronounced after piezocision than before. A strong correlation was observed between the speed of tooth movement and root resorption on the surgical side, but the control side only showed a weak correlation. Conclusions: Piezocision accelerates orthodontic tooth movement and causes increased root resorption.

SIZE OPTIMIATION OF AN ENGINE ROOM MEMBER FOR CRASHWORTHINESS USING RESPONSE SURFACE METHOD

  • Oh, S.;Ye, B.W.;Sin, H.C.
    • International Journal of Automotive Technology
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    • v.8 no.1
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    • pp.93-102
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    • 2007
  • The frontal crash optimization of an engine room member using the response surface method was studied. The engine room member is composed of the front side member and the sub-frame. The thicknesses of the panels on the front side member and the sub-frame were selected as the design variables. The purpose of the optimization was to reduce the weight of the structure, under the constraint that the objective quantity of crash energy is absorbed. The response surface method was used to approximate the crash behavior in mathematical form for optimization procedure. To research the effect of the regression method, two different methodologies were used in constructing the response surface model, the least square method and the moving least square method. The optimum with the two methods was verified by the simulation result. The precision of the surrogate model affected the optimal design. The moving least square method showed better approximation than the least square method. In addition to the deterministic optimization, the reliability-based design optimization using the response surface method was executed to examine the effect of uncertainties in design variables. The requirement for reliability made the optimal structure be heavier than the result of the deterministic optimization. Compared with the deterministic optimum, the optimal design using the reliability-based design optimization showed higher crash energy absorption and little probability of failure in achieving the objective.

Effect of Bead Shape in Aluminum Crash Box for Effective Impact Energy Absorption Under Low- Velocity Impact Condition (저속충돌조건에서 효과적인 충돌에너지흡수를 위한 알루미늄 크래쉬 박스의 비드형상 효과)

  • Lee, Chan-Joo;Lee, Seon-Bong;Ko, Dae-Cheol;Kim, Byung-Min
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.10
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    • pp.1155-1162
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    • 2012
  • The purpose of this study is to investigate the effects of the bead shape on the crash performance of an aluminum crash box under a low-velocity impact condition. The initial peak load and impact energy absorption of a crash box with three types of bead shapes-edge concave, surface convex, and surface concave type-were studied through an FE analysis and an experiment. In addition, the effects of the bead shapes on the crash performance of the crash box were verified through a low-velocity-impact test with a front side member assembled with an aluminum crash box. The initial peak load of the surface-concave-type crash box was reduced by the bead, and therefore, deformation of the front side member at initial contact could be prevented. Furthermore, there was no deformation of the front side member after the impact test because the crash box with a surface-concave-type bead absorbed all the impact energy.

Design Optimization of Auto-body Members for Crashworthiness Enhancement with the Response Surface Method (반응표면법을 이용한 차체 부재의 충돌성능 향상을 위한 설계 최적화)

  • Na Sungyul;Song Junghan;Huh Hoon;Kim Hyunsub
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.81-89
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    • 2005
  • The response surface method is the statistical method which can be applied to the non-sensitivity based optimization. The response surface which is constructed by the least square method contains only the polynomial terms so that the global maximum and minimum points are easily obtained. In this paper, this response surface method is utilized to optimize the crashworthiness of auto-body members. As the first step, the thickness of a simple circular tube is optimized to confirm the application of the response surface method to the crashworthiness. Optimization of the thickness on the front side member is, then, performed with the constructed response surface of the absorbed energy and deformation. Optimization results demonstrate that the absorbed energy and the deformation pattern of the front side member is improved in the viewpoint of enhancement of the crashworthiness.