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.

車両構造部材へのCFRP適用研究

向中野　侑哉（SUBARU）

将来の大規模な軽量化要求に備えた取り組みとして，車両構造部材にCFRPを適用した研究を行っている．CFRP適用時の課題の一つに信頼性がある．CFRP製部品の信頼性に関する知見を得るために実施した，動的疲労強度試験，及び構造用接着剤の疲労特性試験の取り組みを紹介する．

耐火性熱硬化樹脂成形材料の開発

小出　航・井口　英明・井川　亮一（住友ベークライト）

熱硬化性樹脂は，架橋反応により不融となる特性から，耐火性に優れる．我々はフェノール樹脂を用いてバッテリーの熱暴走の進展を抑制するため耐火性成形材料を開発した．本材料はバーナーによる連続的な火炎接触時の灰化進行を抑制する効果があり，さらに射出成形が可能な高流動性も有する．

帯電エアフィルタの性能変化について

小堀　暁・西谷　崇・谷口　一歩（日本バイリーン）・達　晃一（いすゞ自動車）・篠原　直秀（産業技術総合研究所）

車内環境の粒子低減を目的とし，帯電メルトブローフィルタの性能評価を行った．また，各種フィルタ性能の経時変化や帯電の影響を評価し，最適なろ材構成について分析を行った．