Vibration Simulation of Structural Members Bolted with CFRP

Satoru Kuga･Yuuki Kawaharabashi･Yoshinao Kishimoto･Yukiyoshi Kobayashi･Yuki Ohno･Daiki Ariyama (Tokyo City University)

Carbon fiber reinforced plastic (CFRP) is expected to be applied to automotive structural frames, leveraging its excellent specific strength and specific stiffness, as well as its anisotropic properties. In this study, a finite element simulation method was developed to predict the natural vibration modes and natural frequencies of structural members bolted with CFRP. Its effectiveness was evaluated by comparing the simulation results with actual hammering test results.

Effect of Fiber Structure on the Strength of CFRTP Injection Molded Parts

suzuho sasamoto･mutsuki hamada･Souichiro nishino (Ibaraki University)･hidemaru sootome･kenta iwasawa (Industrial Technology Innovation Center of Ibaraki Prefecture)

Lightweight, high-rigidity CFRTP is seeing expanding applications, yet its fiber structure changes depending on molding conditions, leading to strength inhomogeneity.This study reports on the influence of fiber structure on strength through strength evaluation, X-ray CT observation, and orientation analysis.

Development of Recyclable Thermosetting Fiber Reinforced Pultruded Composites for Body Part

Yong Hyeon Shin･Sang Yoon Park･Sang Sun Park (Hyundai Motor)･Jong Hyun Park (Hanwha Advanced Materials)

This study developed recyclable automotive composites part using easily decomposable thermosetting resins to enable recovery of both fibers and resin. Resin viscosity was analyzed, and composite panels were produced via pultrusion molding. Material properties were evaluated, and a body part called "seat-crossmember" was manufactured to verify formability and performance. Finally, recyclability tests confirmed successful recovery, achieving lightweight and eco-friendly benefits.

A Study on the Damping Characteristics of Engineering Plastics for Achieving Vibration and Noise Performance Suitable for Electric Vehicle Drive Environments

HYUN JUN HYUNJUN KIM KIM (HYUNDAI MOTORS COMAPNY)･YUN SEO HYUNJUN KIM PARK (ASCEND PERFORMANCE MATERIALS)

Traditionally, anti-vibration system has relied on rubber isolators and metallic brackets to control vibrations originating from engines and auxiliary drives. However, with the emergence of electric vehicles (EVs) and the growing emphasis on lightweighting, the materials and design approaches used in anti-vibration systems have undergone rapid transformation. In response to these changes, this study investigates the mechanical and damping properties of a newly developed polyamide (PA) material designed to enable structural components to actively contribute to vibration attenuation, beyond their conventional role as static supports. In particular, the paper validates through experimental data a materials design approach that achieves excellent damping performance while maintaining sufficient structural strength.

A Study on the Performance Evaluation Methods of Ion Exchange Resins for FCEV

HYEONGWON PARK･TAEGEUN KIM･SOOHWAN KIM･HAELEE LEE (Hyundai Motor)

To maintain ultra-low conductivity in FCEV cooling systems, ion exchange resins have been considered as a viable approach. However, their application in automotive systems is not yet well established, and evaluation methodologies suitable for FCEV operating conditions remain underexplored. This study proposes a practical framework to assess the thermal performance of ion exchange resins under realistic temperature environments. Resins were thermally aged at 70 °C and 90 °C, followed by measurement of electrical conductivity, pH, and ion exchange capacity. The results indicate noticeable degradation at higher temperatures. Further research should examine mixed-bed interactions and capacity loss without regeneration.

Foaming Prediction Technology for Automotive Polyurethane Using a Model-Based Approach

jin tomotsu (Daikyo Nishikawa)

For polyurethane foaming phenomena, a foaming model integrating reaction properties and visualized data of foaming behavior was constructed to reproduce, through modeling, the formation of cellular structures such as cell diameter, throat diameter, and porosity. This method enables the prior derivation of bubble-control conditions feasible in actual molding, leading to the optimization of molding methods that directly affect acoustic, thermal, and surface quality.