• Title/Summary/Keyword: Bumper back beam

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Investigation of Development of Bumper Back-Beam Using a Thermoplastic Polyolefin (열가소성 폴리올레핀으로 구성된 범퍼 후방 보 개발에 관한 연구)

  • Ahn, Dong-Gyu;Kim, Se-Hun;Park, Gun-Sung
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.8
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    • pp.896-905
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    • 2012
  • Recently, the application of the plastic material to automotive components and structures has steadily increased to satisfy demands on the saving of overall weight and the improvement of energy efficiency. The objective of this paper is to investigate the development of a bumper back-beam using a thermoplastic olefin (TPO). The bumper back-beam was designed to be manufactured from the injection molding process. In order to obtain a proper design of the bumper back-beam, three-dimensional finite element analyses were performed for various design alternatives. Stress-strain curves for different strain rates were measured by high speed tensile tests of the TPO to consider strain rate effects in the FEA. The influence of the sectional shape and the rib formation on the contact force-intrusion curves, the deflection and the energy absorption rate of the bumper back-beam was examined. From the results of the examination, a proper design of the bumper back-beam was acquired. The bumper back-beam consisting of TPO was fabricated from the injection moulding process and the vibration welding. Pendulum crash tests were carried out using the fabricated bumper back-beam. The results of the tests showed that the designed bumper back-beam can satisfy requirements of the federal motor vehicle safety standard (FMVSS). Through the comparison of the previously designed bumper back-beam with the newly designed bumper back beam, it was noted that the weight of the designed bumper back-beam is lighter than that of the previously designed bumper back beam by nearly 16 %. In addition, it was considered that the newly designed bumper back beam can improve recycling of the bumper back-beam.

A Study on the Production of the Back Beam for a Automotive Bumper by Roll Forming Process (롤 성형 공정에 의한 자동차용 범퍼빔 제조에 관한 연구)

  • 정동원;이문용;김광희
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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    • pp.163-170
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    • 2003
  • The back beam for a automotive bumper was roll formed to improve performance, reduce weight and save cost. For the back beams produced by conventional stamping and roll forming, the crashworthiness analyses were carried out by numerical simulation and real impact test. The characteristic properties and applicability of the roll formed back beam are discussed from the results of the analyses.

Development of n Hybrid Bumper Beam Using Simulation (시뮬레이션을 이용한 하이브리드 범퍼 빔 개발)

  • Lee, J.K.;Kang, D.K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.326-330
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    • 2007
  • Bumper back beam is one of the essential structural components of front-end module. It should be designed to withstand a minor bump in low-speed collision, 2.5 mph crash test for example. And weight reduction is always important problem in the design of almost all the parts in car for energy saving. So, the key issues in shape design of a bumper are weight reduction and the performance in 2.5mph crash test. In this study, a light weight and high performance bumper back beam model was developed using analytical approach based on mechanics and FE simulation together.

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Development of Manufacturing Technology for Bumper Back Beam with Sandwich Plate (샌드위치판재를 적용한 자동차 범퍼 빔 개발)

  • Kim, D.K.;Ryu, J.S.;Park, S.E.;Lee, K.H.;Kim, K.H.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.199-202
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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. Tn this process, each pair of forming rolls installed in a forming machine play a particular role in making up the required cross-section and longitudinal shape of the product. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal Front Bumper Beam 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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Analysis techniques for plastic bumper design (플라스틱 범퍼 설계를 위한 해석기법)

  • 심재우
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.3
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    • pp.13-18
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    • 1991
  • 여기서는 자동차 분야중 Plastic이 가장 많이 적용되고 있는 Bumper의 초기 설계 가능성 확인(Feasibility study) 및 최적 설계를 위한 유동해석, 구조해석 그리고 Blow Molding Back-Beam 해석을 위한 PITA(Polymer Inflation and Thinning Analysis) 등의 기법들에 대한 내용 및 적용 방법 등에 대하여 서술하였다. 특히, Energy Absorbing 역할을 하는 Back-Beam은 Blow Molding에 의한 설계방법에 촛점을 맞추었다.

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Development of Al Bumper Back Beam by Using Curvature Extrusion Process (곡률압출공정을 이용한 알루미늄 Bumper Back Beam 개발)

  • Lee, Sang-Kon;Jo, Young-June;Kim, Byung-Min;Park, Sang-Woo;Oh, Kae-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.5
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    • pp.502-507
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    • 2009
  • Curvature extrusion process has several advantages in comparison to the conventional extrusion and bending process. In the curvature extrusion, the extruded part is directly bent during extrusion. Therefore, it does not need additional bending process after extrusion. In the curvature extrusion process, it is possible to produce curved extruded products that have a constant or various curvatures. It is essential that we predict the curvatures of the extruded product to meet the required curvatures. This paper proposed a theoretical model that can predict the curvature of extruded product produced by the curvature extrusion process. Using the proposed model the movement of guide tool that causes the bending of extruded product was controlled to produce the required curved automotive Al bumper back beam. The effectiveness of the proposed prediction model and the movement of guide tool were verified by the FE analysis and curved extrusion experiment.

Steel processing effects on crash performance of vehicle safety related applications

  • Doruk, Emre
    • Steel and Composite Structures
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    • v.24 no.3
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    • pp.351-358
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    • 2017
  • Due to the increasing competition, automotive manufacturers have to manufacture highly safe and light vehicles. The parts which make up the body of the vehicle and absorb the energy in case of a crash, are usually manufactured with sheet metal forming methods such as deep drawing, bending, trimming and spinning. The part may get thinner, thicker, folded, teared, wrinkled and spring back based on the manufacturing conditions during manufacturing and the type of application methods. Transferring these effects which originate from the forming process to the crash simulations that are performed for vehicle safety simulations, makes accurate and reliable results possible. As a part of this study, firstly, the one-step and incremental sheet metal forming analysis (deep drawing + trimming + spring back) of vehicle front bumper beam and crash boxes were conducted. Then, crash performances for cases with and without the effects of sheet metal forming were assessed in the crash analysis of vehicle front bumper beam and crash box. It was detected that the parts absorbed 12.89% more energy in total in cases where the effect of the forming process was included. It was revealed that forming history has a significant effect on the crash performance of the vehicle parts.

Development of Automotive Structural Part Considering the Formability of Sandwich Panel (샌드위치 판재의 성형성을 고려한 차체 부품의 개발)

  • Choi, Won-Ho;Choi, Bo-Sung;Lee, Dug-Young;Hwang, Woo-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.4
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    • pp.33-38
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    • 2012
  • Sandwich composite panel with high strength steel face can reduce the weight of the automotive structural parts. Unlike the parts in aerospace application, the automotive parts are made by the forming process for mass production. The CAE simulation can predict the failures caused by forces and deformation during the forming process. Since the material properties are very important factor for the simulation, we performed the tensile test to get the material properties. The inspections by the optical microscope at each strain level show the states of the polymer resin. The material properties measured by the tensile tests are used for the input data of simulation. The simulation predicts the forming process of the bumper back beam very exactly compared with the try out results.