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FEM에 의한 점용접된 이중모자형 단면부재의 축방향 압궤특성에 관한 연구 (A Study on Axial Collapse Characteristics of Spot Welded Double-Hat Shaped Section Members by FEM)

  • 차천석;김영남;양인영
    • 한국정밀공학회지
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    • 제18권7호
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    • pp.120-126
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    • 2001

  • The widely used spot welded section members of vehicles are structures which absorb most of the energy in a front-end collision. In front-end collision, sufficiently absorbed in the front parts, the impact energy does not reach the passengers. Simultaneously, the frame gets less damaged. This structures have to be very stiff, but collapse progressively to absorb the kinetic energy as expected. In the view of stiffness, the double-hat shaped section member is stiffer than the hat shaped section member. In progress of collapse, the hat shaped section member is collapsing progressively, but the double-hat shaped section member does not due to stiffness. An analysis on the hat shaped section member was previously completed. This paper concerns the collapse characteristic of the double-hat shaped section member. In the program system presented in this study, an explicit finite element code, LS-DYNA3D is adopted for simulating complicate collapse behavior of double hat shaped section members with respect to spot weld pitches. And comparing with the results from the quasi-static and impact experiment, the simulation has been verified.

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STABILITY OF ISOMETRIES ON RESTRICTED DOMAINS

  • Jung, Soon-Mo;Kim, Byung-Bae
    • 대한수학회지
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    • 제37권1호
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    • pp.125-137
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    • 2000

  • In the present paper, the classical results of the stability of isometries obtained by some authors will be generalized; More precisely, the stability of isometries on restricted (unbounded or bounded) domains will be investigated.

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Polyethylene Film포장이 포도 Sheridan의 저장력에 미치는 영향 (Effect of Film Packaging on Storage Life of Grape, Sheridan)

  • 남상영;김경미
    • 한국식품저장유통학회지
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    • 제4권1호
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    • pp.11-15
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    • 1997

  • This experiment carried out to find the storage life according to the kinds of packaging material. Sheridan(Grape) which was fumigated SO2 were wrapped with polyethylenes(Bio-PE and PE) and stored at $0^{\circ}C$ under 90% RH modified condition. The resorts were summarized as follow. Natural weight loss was increased according to the storage time during the 135days storage that was only 1.0-1.7% in sealing section while 10% in non-sealing section. Abonrmal fruits were increased as the storage time was increased and it was 6.6-6.7% in sealing section while 100% in non-sealing during the 135days storage. Quality of appearance and taste are better in sealing section than non-sealing section and it was good in Bio-PE sealing section between packaging materials. Moistrue content was de creased as the storage range was increased and the decreasing rate of that during the storage was 4.9-5.2% in sealing section between treatments. During the storage range increased, the soluble solid degree was increased in non-sealing section but decreased in sealing section.

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