Optimizing the shape of a bumper beam section considering pedestrian protection

Park, D. K.; Jang, Chang Doo; Lee, S. B.; Heo, Seung-Jin; Yim, Hong Jae; Kim, M. S.

doi:10.1007/s12239-010-0060-y

Cited by 21 publications

(7 citation statements)

References 3 publications

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“…The type of the carbon fiber composite used in this article is T300/5208 whose density is 1.6 g/cm 3 and carbon content is 70%. The Poisson's ratio (y 12 ) of the carbon fiber composite is 0.285.…”

Section: Bumper Beam Materialsmentioning

confidence: 99%

Design and analysis of automotive carbon fiber composite bumper beam based on finite element analysis

Wang

2015

Advances in Mechanical Engineering

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In this article, the most important part of the automotive front bumper system, namely, the bumper beam, is studied by changing the material and thickness to improve the crashworthiness performance in low-velocity impact. According to the low-speed standard of automotives stated in E.C.E. United Nations Agreement, Regulation no. 42, the low-velocity impact simulation based on finite element analysis is carried out. Lightweight is the main purpose of this article. First, the bumper beam analysis is accomplished for carbon fiber composite and steel material to analyze their deformation, weight, impact force, energy absorption, and the acceleration of the impactor. As a consequence, the bumper beam made by carbon fiber composite achieves better impact behavior. Second, on the purpose of lightweight, the bumper beams of different thickness including 5.4, 6, 6.6, and 7.2 mm are investigated. The results show that the 5.4 mm bumper beam is the best selection without sacrificing the impact performance. Third, according to the stress distribution, the thickness distribution of the bumper beam is changed to get better lightweight results. It is indicated that the weight of the improved bumper beam is further reduced and the impact performance is not weakened.

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Section: Bumper Beam Materialsmentioning

confidence: 99%

Design and analysis of automotive carbon fiber composite bumper beam based on finite element analysis

Wang

2015

Advances in Mechanical Engineering

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“…In [10] the points were only allowed to move outwards, an overlapping or crossing of sectional parts can, therefore, be avoided to the cost of flexibility and a smaller design space. For example, Park et al [25] defined modifications of a bumper only in the outward direction. The morphing approach in [13] uses the four corners of a rectangular and restricts itself to small shape modifications only.…”

Section: Cross-section Optimisationsmentioning

confidence: 99%

Geometrical compatibility in structural shape optimisation for crashworthiness

Rayamajhi¹,

Hunkeler²,

Duddeck³

2013

International Journal of Crashworthiness

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This paper presents a parametric shape optimisation approach using special parameterisation techniques for shape optimisation of structures with respect to crashworthiness. It is based on SFE CONCEPT which has the ability to modify shape using implicit parameterisation technique and adapt mesh to the new geometry through re-meshing. The success of shape optimisation depends on the type of parameterisation used. It is, therefore, important to choose a set of shape parameters which allow for larger range of shape configurations. However, the difficulty to deal with shape modifications grows with the increasing number of shape variables due to the arising geometrical conflicts. Hence, most shape optimisation studies use limited number of shape variables and also reduced parameter bounds which restrict large shape configurations. Here a new offset mapping technique is used to facilitate the definition of shape parameter conflicts without compromising the design space. To demonstrate this technique, a bumper beam shape optimisation is presented.

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“…Wang et al analyzed the low-speed impact based on dynamic load strength tests of three typical standards of bumper system [ 10 ]. Some new bumper systems were designed using new materials [ 11 – 14 ] or structures [ 15 , 16 ] to achieve the purpose of improving the crashworthiness under the two collision circumstances. In study of Lv et al, a systematic method had been performed to design and optimize the car front-end structure in order to reduce pedestrian injury risks [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Design of a Conceptual Bumper Energy Absorber Coupling Pedestrian Safety and Low-Speed Impact Requirements

Zhao

et al. 2018

Applied Bionics and Biomechanics

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The car front bumper system needs to meet the requirements of both pedestrian safety and low-speed impact which are somewhat contradicting. This study aims to design a new kind of modular self-adaptive energy absorber of the front bumper system which can balance the two performances. The X-shaped energy-absorbing structure was proposed which can enhance the energy absorption capacity during impact by changing its deformation mode based on the amount of external collision energy. Then, finite element simulations with a realistic vehicle bumper system are performed to demonstrate its crashworthiness in comparison with the traditional foam energy absorber, which presents a significant improvement of the two performances. Furthermore, the structural parameters of the X-shaped energy-absorbing structure including thickness (t u), side arc radius (R), and clamping boost beam thickness (t b) are analyzed using a full factorial method, and a multiobjective optimization is implemented regarding evaluation indexes of both pedestrian safety and low-speed impact. The optimal parameters are then verified, and the feasibility of the optimal results is confirmed. In conclusion, the new X-shaped energy absorber can meet both pedestrian safety and low-speed impact requirements well by altering the main deformation modes according to different impact energy levels.

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Optimizing the shape of a bumper beam section considering pedestrian protection

Cited by 21 publications

References 3 publications

Design and analysis of automotive carbon fiber composite bumper beam based on finite element analysis

Design and analysis of automotive carbon fiber composite bumper beam based on finite element analysis

Geometrical compatibility in structural shape optimisation for crashworthiness

Design of a Conceptual Bumper Energy Absorber Coupling Pedestrian Safety and Low-Speed Impact Requirements

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