Development of High-Rresponse Heat Insulation Material Technology in Engine Combution Chamber to Improve the Fuel Economy （4th Report)
-Development of Adhesion Model and Substrate Surface Roughening Model for Heat Insulation Material-

Kai Yamamura (Mazda)

To decrease cooling loss of engines and improve fuel economy, we are developing heat insulation material technology. In order to achieve sufficient adhesion of the heat-insulation coating, the substrate surface should get roughened for mechanical bonding. We developed a new method to quantify adhesion and revealed which roughness parameter to control. In addition, we developed the surface roughening model to achieve desirable roughness efficiently.

Simplified Evaluation of Internal Residual Stresses in Steel: Proposal of the Half-Cut Method

Satoru Nishida･Eiki Kobayashi (Akiyama Seiko)･Souichiro Nishino (Ibaraki University)

The measurement of internal residual stress in drawn round steel bars is challenging. We propose a half-cut method to evaluate the internal residual stress calculated through FEM analysis of the drawing process, using X-ray diffraction. A half-model is employed for FEM analysis, where the symmetry plane constraints are released after drawing. The evaluation is conducted by measuring the axially half-cut plane using X-ray diffraction.

Quality Improvement of Mastic Application Areas through the Utilization of Body Thermal Deformation CAE

Koichiro Oi･Takeshi Kashiyama･Toshiro Ohori･Moe Yasue (Suzuki Motor)

In automobile manufacturing, the roof panel and its internal structural components are bonded using a heat-curing elastic adhesive known as mastic.
After the mastic is applied during the body assembly process, it is cured utilizing the heat from the paint shop's oven .
However, instances of unintended deformation of the mastic have been observed during this curing process.
Assuming that the cause is the thermal deformation of the body during the oven curing, we investigated it through various experimental and CAE analysis. This report presents the results of these investigations.

Analysis of lifespan distribution, dirt and deterioration state of seat belt webbing recovered from End-of-Life Vehicles for Closed-loop Recycling (First report)

TAKERU FUKUDA･MASATOSHI KOBAYASHI (Honda R&D)･RUMI OGAWA･YUTAKA FUJIWARA (Sumika Chemical Analysis Service)

When recycling ELV PCR into recycled materials, the quality of the PCR is thought to have a significant impact on the condition of the PCR. In order to stabilize the quality of the recycled materials, it is important to understand the quality of the PCR. In this study, seat belt webbings from approximately 700 ELVs were collected for only five days in early March 2024. The results of the analysis of the distribution of age, dirt, and deterioration are reported here.