• 한국자동차공학회논문집
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• 제25권1호
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• pp.11-18
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• 2017

In the present study, the low speed (4 km/h) crash behaviour of an aluminium bumper system was characterised by FE analyses based on the FMVSS 581, which regulates automotive bumpers. Two types of cross-sectional designs, i.e., Model 1, which contains a single rib and Model 2, double ribs, have been considered along with Al7021, 6082 and 6060 for the aluminium bumper back beam. Variations in thickness starting from 2 to 4 mm of the bumper system cross-section in the FE model was implemented in order to investigate the thickness effect on the bumper's crash behaviour.. Three kinds of design variables, namely, number of ribs, material and thickness, are considered. The FE analysis results are summarised with the maximum load and the Specific Energy Absorption (SEA) since they are the key factors in determining the crashworthiness of automotive structures. The results may also be able to indicate how to achieve lightweight structure of the automotive bumper system either directly or indirectly.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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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.

• 대한기계학회논문집A
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• 제36권12호
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• pp.1675-1682
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• 2012

경량화는 대기오염과 자원고갈의 측면에서 매우 중요하게 인식되고 있어, 많은 자동차용 부품이 Al 및 Mg 합금으로 대체되었으며, 관련 연구가 지속적으로 증가하고 있다. 그러나 Mg 합금은 Al 합금에 비해 높은 재료비와 난성형성으로 인한 낮은 생산성 때문에 제한적으로 적용되고 있다. 본 연구에서는 FEA를 이용하여 자동차 범퍼 백 빔용 관재에 대한 공정조건을 분석하였으며, 생산성을 향상시킬 수 있는 방법을 확립하였다. 물성치 확보를 위해 물성시험을 수행하였으며, 소성변형 중 발생하는 열 관련 물성을 정의하기 위하여 단순형상에 대한 실험과 해석을 수행하였다. 이후 온도조건 및 램 속도를 고려하여 제품에 대한 해석을 수행하였다. 이를 통하여 압출공정조건을 확립하였으며, 표면결함이 없는 제품을 성형하는데 성공하였다.