Development of Plastic Materials for Striker-cap to Reduce Frictional Noise

Mingyun Chung･Daeki Chung (Hyundai Motor)･Sunghyun Myung (Kolon Plastics)

BSR noise originating from the striker-cap has been one of chronic issues within suspension system. This squeak noise arises from frictional interactions between the plastic striker-cap and the polyurethane bump-stopper of the shock-absorber. Its significance has been accentuated with the recent trend towards electrification. Nevertheless, research on frictional behavior between two plastic components has been rarely conducted, compared to plastic to metal or metal to metal. In this study, we focused on the development of plastic materials for the striker-cap with reduced BSR noise by manipulating additive materials in polyamide compounds based on friction theory.

Study on Thermo-chemical Aging Model and Field Lifetime Prediction of Plastic in Cooling Systems

Hyeongwon Park･Kyunghwan Oh･Jee Young Youn･Soonbeom Kwon (Hyundai Motor)

Plastics are increasingly used in automotive, targeting light-weighting and energy efficiency improvement. However, being susceptible to aging, they have less durability than metals, making accurate lifespan prediction crucial. Despite the use of thermal aging models like TTS and the Arrhenius Equation for accelerated life testing, their accuracy is compromised under complex conditions with multiple aging mechanisms. This study proposes a new aging model based on a modified Weibull function, validated across material, specimen, and component. This model enables accurate aging prediction, problem analysis, and new material lifespan prediction under suitable accelerated evaluation conditions.

A Study of CFRP Application on Vehicle Structural Components

Yuya Mukainakano (SUBARU)

As preparation for future large-scale weight reduction, we introduce the study which applied carbon fiber reinforced plastic (CFRP) to vehicle structural parts. One of the problems in the application of CFRP is reliability. We will introduce the study examples of dynamic fatigue strength tests and fatigue characteristics tests of structural adhesives to gain knowledge on the reliability of CFRP parts.

Development of Fire-resistant Thermosetting Resin Molding Compound

Kazu Koide･Hideaki Inokuchi･Ryoichi Igawa (Sumitomo Bakelite)

Thermosetting resins become non-melting by cross-linking reactions and exhibit superior fire resistance. We developed a fire-resistant molding material using phenolic resin to suppress the progression of thermal runaway in batteries. The developed molding material inhibits the progression of ashing under continuous flame contact from a burner, and also possesses good enough material flow for screw injection molding.

Evaluation of Filtration Performance Variation in Electret Air Filter

Satoru Kobori･Takashi Nishitani･Kazuho Taniguchi (Japan Vilene)･Kouichi Tatsu (Isuzu Motors)･Naohide Shinohara (AIST)

We evaluated the filtration performance of electret Melt-Blown filter media to reduce particle concentration in the cabin environment.  In addition, we analyzed filter media specification by the evaluation of performance variations over time and effects of electrostatic charge in the electret air filter.