The automotive industry continuously strives to enhance safety for both drivers and passengers through technological advancements. Car side impacts have the potential to significant risks to passengers, So the automotive industry has proposed various technological solutions. As part of these efforts, the development of side impact beams, which are affixed to the inner frame of vehicle side doors to absorb and dissipate collision energy, has been a safety enhancement. Conventional side impact beams are manufactured using hot-rolled steel sheets and have a pipe-like configuration. However, these impact beams are fixed to the vehicle's chassis, which directly transfers the energy generated during a collision to the chassis frame. This paper aims to address this issue by proposing the development and optimization of vehicle door impact beams using a dual-beam structure and fastening method, utilizing shear bolts. Moreover, the focus is on optimizing the cross-sectional shape of the dual-beam impact structure. The evaluation criterion for optimization is based on the second moment of area of the cross-section. To validate these improvements, Static experiments were conducted, comparing the proposed dual-beam structure with the traditional impact beam. This research is expected to serve as a guideline for enhancing vehicle safety through design directions and validation methods.

Prior to the design and production stages of the center pillar, the structural analysis must be carried out at the concept stage. Commercial softwares for the structural analysis provide benefits such as performance prediction and deformation. In this study, the structural analysis using SolidWorks was performed to investigate the stress and displacement characteristics of the center pillar for two types of collision positions and velocities. As the impact velocity increased, the maximum equivalent stress and displacement of the center pillar were larger. In the case of passenger cars, the equivalent stress and displacement according to the velocity change increased by about 133% and 116% at 16.5m/s , based on 5.5m/s . Also, the equivalent stress and displacement in the SUV car increased by about 119% and 378%, respectively

Among the various parts of automobile, automotive seat is the most fundamental item that ride comfort can be evaluated as the part contacted at human body. Dynamic stabilities on 3 kinds of models are analysed according to inside beam configuration of rear seat frame in this study. Model 1 has the basic design of straight beam. Model 2 has the beam that is curved slightly from model 1 configuration and model 3 has honeycomb structure. Total deformations and equivalent stresses are investigated when these models are crushed at side. Total deformations due to frequencies are also obtained and critical frequencies on these frequency responses are investigated. By comparing total deformation configurations of model 1,2 and 3, model 1 and 2 apply the damage to passengers but model 3 absorbs the damage. Model 1, 2 and 3 show total deformations of 482.7, 178.9 and 151.62 mm at the critical frequencies of 180, 200 and 150Hz respectively. Because model 3 does not apply the damage to passengers and the total deformation at critical frequency becomes minimum among three models on frequency response, this model becomes most stable among 3 kinds of models when crushed at side.

The computer-based simulation tools are currently used overwhelmingly to simulate the performance of automotive designs. Then, the search for an optimal solution that satisfies a number of performance requirements usually involves numerous iterations amon

According to a statistics, in recent three years number of traffic accident and casualty remain stand still while casualty by car to car side crash has been increased. This phenomenon is attributed to the two main factors. One is vehicle structure and the other is vehicle safety regulation which does not appropriately reflect current market situation. The distance from vehicle side door to occupant is kind of short compare to vehicle front to occupant, so the likelihood of occupant injury or death at side crash accident is higher than any other types of accident. Even Korean government runs to evaluate and improve vehicle side impact crashworthiness, this program does not reflect current vehicle fleet cause it is based on vehicle fleet of more than 20 years ago. In this paper, three sets of car to car side impact test have done to evaluate occupant injury probability and aggressivity of SUV to passenger vehicle, and based on this result the way to reduce injury and fatality likelihood at side crash is recommended.

기초에 강결되어 도로변에 노출된 각종 지주는 정면충돌 뿐 아니라 측면충돌에 특히 위험하다. 클립형 단부분리장치를 갖는 지주는 정면충돌에 효과적이고 다방향으로 분리가 가능하기 때문에 측면충돌에도 효과적이다. 본 논문은 강결된 지주의 측면충돌에 대한 위험성을 보이고 클립형 단부분리장치를 갖는 지주의 충격완화 효과를 보이기 위하여 측면충돌실험을 실시하고 그 결과를 분석 정리한 것이다. 이를 위하여 미국의 NCHRP Report 350을 기반으로 측면충돌의 기준을 제시하고 D101.6mm(t=4.2mm)의 지주가 강결된 경우와 클립형 단부분리장치로 연결된 경우에 대하여 820kg의 소형차로 충돌속도 50km/h의 측면충돌실험을 실시하였고 단부장치의 저속분리가 가능한가를 35km/h의 측면충돌실험으로 확인하였다. 강결지주는 차량의 과다한 변형 및 전복, 안전지수 측면에서 측면충돌에 치명적이지만 클립형 단부분리장치로 기초에 연결된 경우 충돌피해를 크게 줄일 수 있음을 확인하였다.

Shock wave caused by the high-velocity impact causing the tensile strain and stress on the rear side. When the tensile strain and stress exceeds the tensile strength of the concrete, scabbing and perforation were occurred. The strain on the rear side was reduced due to improvement of the tensile strength by fiber reinforcement.

Shock wave caused by the high-velocity impact causing the tensile strain and stress on the rear side. When the tensile strain and stress exceeds the tensile strength of the concrete, crack and fracture were occurred. The strain on the rear side was reduced due to Improvement of the tensile strength by fiber reinforcement and increasing the specimen thickness.