• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2000년도 추계학술대회 논문집
• /
• pp.143-148
• /
• 2000

This paper describes how to make tailored blanks of front side member that were composed of high strength steel and TRIP(TRansformation Induced Plasticity) steel for weight reduction and improvement of crash load. Tailored blanks made by laser and mash-seam welding were compared with non-tailored blanks made by spot welding. Static compression tests were performed for performance comparison of each sample. Front side members made by tailored blank were superior to those made by spot welding in the initial, but those results were inverse in the last. Average load of tailored blank in six-angle type was better than that of rectangular type.

• 소성∙가공
• /
• 제10권3호
• /
• pp.200-205
• /
• 2001

This paper describes how to make tailored blanks of front side member that were composed of high strength steel and TRIP(TRansformation Induced Plasticity) steel for weight reduction and improvement of crash load. Tailored blanks made by laser and mash-seam welding were compared with non-tailored blanks made by spot welding. Static compression tests were performed for performance comparison of each sample. Front side members made by tailored blank were superior to those made by spot welding in the initial, but those results were inverse in the last. Average load of tailored blank in six-angle type was better than that of rectangular type.

• 한국도로학회논문집
• /
• 제13권4호
• /
• pp.9-17
• /
• 2011

국내 지침에 의하면 성능기준에 적합한 노측용 방호울타리만이 도로 현장에 설치될 수 있다. 그러나 공용중인 고속도로 노측의 상당 구간에는 지침 개정 이전에 설치된 성능이 미흡한 기존 구형 가드레일이 설치되어 있어서 고속도로 운전자의 안전을 위협하고 있다. 구형 가드레일은 전국의 고속도로에 약 2,777km가 설치되어 있으며 일률적으로 동시에 모든 구간의 가드레일을 교체하기란 예산상 어려움이 많아 최소한의 보강을 통해 국내 지침에 만족스럽게 보강개선된 가드레일을 개발하는 것이 본 연구의 목적이다. 본 연구에서는 LS-DYNA 3D를 이용한 충돌시뮬레이션과 실물차량 충돌시험을 통해 철재 노측용 가드레일 보강방안(SB1, 3, 5등급)을 개발하였고 개발된 가드레일 보강개선방안은 차량의 충돌 및 이탈사고의 심각성을 감소시켜 도로의 안전도를 개선, 향상시킬뿐만 아니라 많은 예산절감을 기대할 수 있다.

• 한국자동차공학회논문집
• /
• 제13권6호
• /
• pp.84-92
• /
• 2005

This paper is concerned with optimum design of a center-pillar assembly induced by the high-speed side impact of the vehicle. In order to simulate deformation behavior of the center-pillar assembly, simplified finite element model of the center-pillar and a moving deformable barrier are developed based on results of the crash analysis of a full vehicle model. In optimization of the deformation shape of the center-pillar, S-shaped deformation is targeted to guarantee reduction of the injury level of a driver dummy in the crash test. Tailor-welded blanks are adopted in the simplified center-pillar model to control the deformation shape of the center-pillar assembly. The thickness of each part which constitutes the simplified model is selected as a design parameter. The thickness of parts which have significant effect on the deformation mechanism are selected as design parameters with sensitivity analysis based on the design of experiment technique. The objective function is constructed so as to minimize the weight and lead to an S-mode deformation shape. The result shows that the simplified model can be utilized effectively for optimum design of the center-pillar members with remarkable saving of computing time.

• 소성∙가공
• /
• 제18권4호
• /
• pp.304-309
• /
• 2009

Quenchable boron steel is a new type of high strength steel to reduce the weight of automobiles and maintain the safety conditions. Quenchable blanks can be hot-stamped and hardened in a water-cooled tool to achieve high strength. In this paper, new alloy for hot stamping is designed based on requirement of mechanical properties and two types of surface coating are investigated in viewpoints of oxidization and exfoliation. An automotive part of center pillar is manufactured by hot-stamping using Al-Si coated sheet. The performance of developed part is compared by static compression test and side impact crash test.

• 한국자동차공학회논문집
• /
• 제10권4호
• /
• pp.141-148
• /
• 2002

Repair were made for front pillar, center pillar and side-step panel for lightweight vehicles with head-on and 40% off-set collision of 15 km/h in a RCAR standard. The salt dilution was sprayed and the compression tests were performed for vehicles with and without anti-corrosional treatment after repair. After 764 hours of salt-dilt sprayed test without using anti-corrosion, the mean penetration depth fur corrosion was shown to be 58% of the thickness. The resulyed decrease in bending stiffness by 10∼20% can cause reduction of the residual life and crash-absorption capability for damaged vehicles. The corrosoin safety tests showed that the anti-corrosional treatment should be made to improve the safety characteristics for a or damaged car.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
• /
• pp.37-40
• /
• 2008

We have concentrated on the performance improvement of each part for durability, safety and cost of high pressure storage system for fuel cell vehicle so far. But for the mass production of fuel cell vehicle, it is necessary to evaluate durability and safety in system module. We built the standard to evaluate and collision safety of high pressure storage system for fuel cell vehicle, and could verify reliability of high pressure storage system.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2004년도 추계학술대회 논문집
• /
• pp.1105-1108
• /
• 2004

This paper describes the structural analysis result and load test result of accident EMU(Electric Multiple Units). Structural analysis and load test of EMU were performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The purpose of the load test is to evaluate a safety which carbody structure shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load and operating condition. The results have been used to provide the critical information for the criteria of safety assessment.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 춘계학술대회논문집A
• /
• pp.224-229
• /
• 2000

This paper describe a (mite element computer simulation of a absorption system using full scale car crash test. The full scale test selected for this study is a 80kmh frontal, side and 25% offset impact of a 1993 Ford Taurus vehicle into a absorption system. This absorption system has external rubber and internal steel pannel. This simulation has completed for decision of these components energy absorption performance. Dynamical performance of this system and movement are obtained from this simulation. and then We can appreciate the safety of passenger from measure the vehicle C.G's acceleration.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 춘계학술대회
• /
• pp.1035-1040
• /
• 2004

In the proto design stage of a new car, the performance of an occupant protection system is often evaluated by CAE instead of the real test. CAE predicts and recommends the appropriate design values hence reducing the number of the real tests. However, the existing researches using CAE in predicting the performances do not consider the uncertainties of parameters, in which inconsistency between the actual test results and CAE exists. In this research, the optimization procedure of a protection system such as airbag and load limiter is suggested for the frontal collision. The DACE modeling known as Kriging interpolation is introduced to obtain the meta model of the system followed by the tabu search method to determine a global optimum. Finally, the distribution of a suggested design is determined through the Monte-Carlo Simulation.