Effect of Changes Over Time in the Surface Crystallinity of Polypropylene on Adhesion

Takuo Saiki･Akihisa Otsuki･Haruo Unno (Nissan)

Resinization of car body parts is required to reduce the weight of automobiles, and some resin parts have adhesive joints. In this study, we investigated the adhesive properties of PP with respect to the storage term from injection molding to bonding, and found that the increase in surface crystallinity over time causes a decrease in toughness, which in turn affects adhesive properties.

Study on Fatigue Life Prediction of Lithium-ion Battery Electrode Materials with Stress Ratio

Atsuki Takeuchi･Yudai Furuhata･Yoshinao Kishimoto･Yukiyoshi Kobayashi (Tokyo City University)･Yasushiro Otsuka･Yuki Kawata･Jun Kanai (TA Instruments Japan)･Hajime Okui (Dainen Material)

Lithium-ion batteries are used in electric vehicles, etc., and ignition accidents often occur. The cause of such accidents is the occurrence of internal short-circuits due to damage to electrode materials and separators, but there are few studies on fatigue damage of the electrode materials. In this study, fatigue characteristics of electrode materials with stress ratios were investigated, and fatigue life prediction was attempted when approaching the actual working load.

Evaluation of Dissipated Strain Energy of Lithium-ion Battery Anode Material Using SBR-based Binder by Dynamic Mechanical Analysis

Yudai Furuhata･Atsuki Takeuchi･Yoshinao Kishimoto･Yukiyoshi Kobayashi (Tokyo City University)･Yasushiro Otsuka･Yuki Kawata･Jun Kanai (TA Instruments Japan)･Hajime Okui (Dainen Material)

Damages to electrode materials in lithium-ion batteries, which are used as power sources for electric vehicles and other applications, lead to reduced power generation performance and ignition. In this study, dynamic mechanical analysis has been introduced to establish an evaluation method for the deformation characteristics of electrode materials, and the dissipated strain energy of the anode material fabricated with SBR-based binder was evaluated at various input frequencies.

Experimental Investigation of Fracture Behavior and Regional Strength of Automotive Windshields under Stone Impact

koya sugawara･masaki kawamura (Honda Motor)

This study experimentally investigates the fracture behavior of automotive windshields subjected to stone impacts. The location of crack initiation and the propagation patterns were examined and categorized. The resulting fracture patterns provide a basis for estimating the impact conditions from actual damage, offering valuable insights for improving safety design and post-damage analysis.

Modeling the Drying Process of Fuel Cell Catalyst Inks for Predicting Catalyst Layer Properties

Takanori Sugiura･Yuki Ota･Ryosuke Maekawa･Yuji Kurotani (OYOTA MOTOR CORPORATION)･Yoshiko Ito (Leica Microsystems)･Yuri Nishino･Atsuo Miyazawa (Graduate School of Science, University of Hyogo)

The fuel cell catalyst layer is produced by drying the catalyst ink. The mesoscale structures formed during the drying process influence the material properties of the catalyst layer so that it is necessary to develop the prediction techniques considering the drying process. In this study, we simulate the drying process of the catalyst ink and conduct material properties predictions of the catalyst layer by using the structures from the drying process simulation.