Development of Ultra-High-Strength steel crash box using buckling trigger

Koichi Nakagawa･Kazuhiko Higai･Tsuyoshi Shizaki (JFE steel)

The optimal shape and placement of trigger were studied through simulation, followed by prototype fabrication and performance evaluation. These features suppressed fatal fractures in ultra-high strength steel and enabled accordion-like deformation of the crash box. As a result, a lightweight component with equivalent energy absorption to conventional parts was successfully developed.

Development of Advanced Technologies for Further Functional Integration of Components

Toru Yonebayashi･Tasuku Zeniya･Atsushi Ohno･Mashiko Abe･Takashi Kawachi･Masahiro Kubo･Kenta Ikegami･Toru Okada･Hiroshi Yoshida (Nippon Steel Corporation)

Rear modules and floor modules are introduced as high-performance integrated components made from hot-stamped steel sheets. In addition, structures and forming technologies that enable further improvements in crash performance compared to conventional integrated components are presented.

Development of Reinforcement Structure for Hat Shape Component under Eccentric Loads

shuki nakamura･kenichi watanabe･mie tachibana (Kobe Steel)

Due to the increase in vehicle weight associated with BEV adoption, structures capable of absorbing higher collision energy than before are required. In this study, we examined reinforcement structures for hat-shaped components using crash simulation. Our focus was on designs that provide superior energy absorption performance relative to component weight. The evaluation was conducted under conditions simulating an ODB frontal impact, where axial crushing and bending occur simultaneously. The configuration in which small hat-shaped members are arranged on the hat web surface demonstrated excellent energy absorption efficiency.

Analysis of Material Properties and Structural Factors on Impact Resistance of Door Trim

Yumiko Unrinin (DAIHATSU MOTOR .CO.JP)･Hirofumi Kishi･Kazuyoshi Baba (DAIHATSU MOTOR.CO.JP)

As digital twin technology is increasingly utilized in automotive design, the prediction of impact resistance has become one of the most important issues. While polymer components enable the realization of diverse designs, the prediction of their impact resistance is significantly complicated due to inhomogeneous stiffness and the nonlinear stress-strain behavior. In this study, we investigate the correlation between the impact resistance of actual components and the material properties evaluated using flat plate specimens, and report the factors effects impact resistance.

Mechanical Properties and Formability of Steel Sheets Made from Obsolete Scrap in Electric Arc Furnaces

Noriyuki Nakanishi･Masaru Iwasaki･Shintarou Adachi･eizaburou Nakanishi (TOKYOSTEEL)

The aim is to promote domestic recycling of iron scrap, approximately 8 million tons of which are exported annually. While elements such as copper contained in obsolete scrap have been considered to degrade properties, few reports exist on actual automotive steel sheets manufactured. This report presents the effects on mechanical properties and formability of steel sheets when varying the content of these elements.