• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 추계학술대회 논문집
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• pp.261-266
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• 1998

In this study, crush characteristics of thin-walled rectangular tube is investigated. The stiffness of the element is obtained from analytical moment-rotation relationship and approximated load-deflection relationship of thin-walled rectangular tube. A computer program is developed for the large deformation analysis of frame. An incremental displacement method is used in the program and at each incremental stage, the stiffness matrix of the total structure is checked with the state each element for bending and compression.

• 대한기계학회논문집A
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• 제36권9호
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• pp.997-1002
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• 2012

수송기기의 연비향상과 에너지 절감을 위하여 자동차 업계를 비롯한 각종 산업 전반에 마그네슘 합금의 적용이 확대되고 있는 추세이다. 조밀육방 격자 구조(HCP)를 갖는 마그네슘 합금의 경우, 낮은 성형성과 강한 소성 비대칭성 및 소성 이방성으로 인하여 실제 부품의 적용에 많은 제약조건이 수반되고 있다. 본 논문에서는 CPB06 항복함수를 이용하여 AZ31의 인장-압축 비대칭성을 모델링하고 이를 이용하여 AZ31 튜브의 압괴해석을 수행하고자 하였다.

• 한국자동차공학회논문집
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• 제3권3호
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• pp.29-36
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• 1995

The present paper deals with the crushing characteristics of double hatted-section tube used in body structure of passenger car. Being crushed, a double hatted-section tube shows symmetric or antisymmetric buckling mode according to section aspect ratio and flange size. Zone of buckling mode is shown by numerical methods. It is supposed that crippling behavior of double hatted-section tube corresponds with rectangular tube without flange. Crippling plate coefficient is also calculated when section aspect ratio of tube is higher than one.

• 한국철도학회논문집
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• 제19권2호
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• pp.109-116
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• 2016

고속철도 차량의 시장 점유율은 전 세계적으로 확대되고 있다. 고성능 충격 에너지 흡수 요소는 철도차량의 안전 기준을 충족하는 것이 필수 요소이다. 변형 튜브 조립체는 철도 차량에 대한 전형적인 에너지 흡수 요소이다. 그것은 변형 튜브와 압입 펀치로 구성되어 있으며 튜브 조립체의 성능은 튜브의 소성 영역에서 흡수 에너지 특성에 의존한다. 본 논문의 변형 튜브에서 흡수하는 소성변형 에너지는 200kJ의 철도차량 충돌 에너지를 흡수하도록 설계되어 있다. 슬래브 법과 유한 요소해석을 사용하여 초기 단계에서 펀치의 반력은 예측되며 설계된 튜브 조립체의 성능은 실험으로 확인되었다.

• 한국자동차공학회논문집
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• 제9권6호
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• pp.195-200
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• 2001

Composites have wide applications in aerospace vehicles and automobiles because of the inherent flexibility in their design for improved material properties. Composite tribes in particular, are potential candidates for their use as energy absorbing elements in crashworthiness applications due to their high specific energy absorbing capacity and the stroke efficiency. Their failure mechanism however is highly complicated and rather difficult to analyze. This includes fracture in fibres, in the matrix and in the fibre-matrix interface in tension, compression and shear. The purpose of this study is to investigate the energy absorption characteristics of CFRP(Carbon Fiber Reinforced Plastics) tubes on static and impact tests. Static compression tests have been carried out using the static testing machine and impact tests have been carried out using the vertical crushing testing machine. Interlaminar number affect the energy absorption capability of CFRP tubes. Also, theoretical and experimental have the same value.

• 한국자동차공학회논문집
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• 제7권8호
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• pp.180-189
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• 1999

This paper describes the collapse characteristics of the rectangular tube under eccentric compressive load. Local buckling stress and maximum crippling load are investigated. A thin-walled tube under load is controlled by local buckling or yielding of material according to the ratio of thickness to width (t/b) of the cross section, and subsequent collapse of the section. The relationship can be divided into three regions : elastic , post-buckling and crippling . the load-displacement relationship is theoretically presented in each region by introducing the stress distribution of the cross section in the loading process. And the maximum load carrying capacity is derived in the closed form as a function of normal stress on the flange and web.