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Predecessor
Volume 80, Issue 4
Displaying 1-9 of 9 articles from this issue
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[in Japanese]2007 Volume 80 Issue 4 Pages 119
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (147K) -
Yoshitaka UCHIYAMA2007 Volume 80 Issue 4 Pages 120-127
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn this article the development of rubber friction and wear research is reviewed. Friction and wear of rubber are very important for the automobile tires, belts, seals and rolls. The brief history of rubber tribology is summarized in a table.
The friction force of rubber consists of adhesion term and deformation term. Therefore the frictional behaviors mainly related to the viscoelastic properties of rubber. The influence of surface texture on rubber friction is also discussed. The friction of silica-filled SBRs, and the relationship between μ-v characteristics and friction vibration are explained. The rubber wear, pattern abrasion mechanism, the influence of mechanical properties on the wear, the environmental effect of rubber wear, and the wear of silica-filled SBR are discussed.View full abstractDownload PDF (7555K) -
Tomoaki IWAI2007 Volume 80 Issue 4 Pages 128-133
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe visualization of the rubber slip in the contact area during rolling-sliding friction was reviewed. The contact area between the rotating rubber wheel and the mating glass was observed simultaneously to understand how the sliding region and the adhesion region related to the μ-S characteristics during the rolling-sliding friction. Small markers with equal intervals were observed to measure the movement rates of the rubber surface in the contact area. As the results, the adhesion region and the sliding region in the rolling-sliding contact area were measured during sliding. The adhesion region, however, decreased to zero as the slip ratio attained to 15%. There was only the sliding region in the contact area at the slip ratio more than 15%.View full abstractDownload PDF (7989K) -
Ken NAKANO2007 Volume 80 Issue 4 Pages 134-139
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe limitation of the occurrence of stick-slip vibration is explained which has been obtained analytically based on a 1-DOF system with Coulomb friction. The limitation is determined by two dimensionless parameters; one denotes the easiness for the occurrence of stick-slip vibration and the other is the damping ratio acting to suppress the vibration. A simple non-occurrence inequality of stick-slip vibration is proposed with two dimensionless parameters, which has both high accuracy and high usability.View full abstractDownload PDF (5511K) -
Iwakazu HATTORI, Toshihiro TADAKI2007 Volume 80 Issue 4 Pages 140-146
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe tire test was carried out by twelve tires, which were made of various BRs and SBRs. From these results, the overpowering correlation was glass transition temperature with abrasion resistance. Sn coupled SBR reacted with carbon black (CB), and the bound rubber was increased than that of the non-modified SBR, so the abrasion resistance was improved. CB was very well dispersed in the SBR. On the case of silica filled compound, the modified SBR with SiOR group reacted with silica, and the abrasion resistance was also improved. A method to introduce a functional group into high cis-BR was developed recently, and the abrasion resistance of the modified BR was improved. We reviewed about these functional group introduction methods and abrasion resistance.View full abstractDownload PDF (6096K) -
Shunichi YAMAZAKI2007 Volume 80 Issue 4 Pages 147-152
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe wet grip performance of tires is decreased when the rolling resistance is reduced by the change of the tread rubber compound.
The wear rate also becomes faster when the wet grip performance is improved. From these facts it is difficult to solve the trade-off between these performances.
In recent years silica filled compounds are widely used as tread rubber to solve the trade-off between wet performance and rolling resistance.
However, we have to develop new other methods due to the limitation in achieving the further improvement od these performances by means of the tread rubber development.
In this paper the method for the improvement of the braking performance was described using structural mechanics of tires.View full abstractDownload PDF (2225K) -
Mitsuya NIHEI2007 Volume 80 Issue 4 Pages 153-158
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSTire performance on iced road depends on the characteristics of the ice on roads. Caused by the prohibition of application of the studded tires on the winter roads (1990-), the condition of the tires and winter roads have been varied extremely. AIST had developed the In-Door Tire Tester to study and clarify the characteristics of tires on iced roads. This paper describes outline of this In-Door Tire Tester and interesting tire phenomena on iced roads obtained through the studies on this tester. One phenomenon is characteristics on the smooth ice surface and the other is the one on the rough ice surface. Namely: (1) The tire characteristics on the smooth ice depend on ice temperature and the electric conductivity of the ice for the test. So, we proposed to measure the electric conductivity of the water obtained by melting the test ice as the index (or scale) for classifying the characteristics of the test ice. (2) Braking force coefficients on the rough ice surface depend on the texture of the ice surface (amplitude and wavelength of the surface roughness).View full abstractDownload PDF (12070K) -
Shoji OIDA2007 Volume 80 Issue 4 Pages 159-162
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSRecent progress of computational mechanics enabled us to simulate large-scale coupling problems, in which the interaction between the deformation of tire structure and of surrounding medium can be considered. Bridgestone Corporation has been developed simulation technologies to predict tire performance on nearly all kinds of road surfaces, and they are collectively called CROSS. Various kinds of phenomena of tires with arbitrary tread pattern running on deformable medium have been predicted using CROSS technology.
This paper aims to introduce the simulation technology used in CROSS, especially for the choice of their physical phenomena to be numerically modeled. The fluid characteristics are mathematically modeled using appropriate constitutive law, and then the water, snow, and soil are numerically modeled. The complex fluid/structure interaction can be analyzed. Predicted results are in good agreement with experimental data.View full abstractDownload PDF (10256K) -
[in Japanese]2007 Volume 80 Issue 4 Pages 163-164
Published: April 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (355K)
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