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Volume 58, Issue 5
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1985 Volume 58 Issue 5 Pages 281-305
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (1593K) -
1985 Volume 58 Issue 5 Pages 305
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (61K) -
[in Japanese]1985 Volume 58 Issue 5 Pages 306-318
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDownload PDF (918K) -
FRICTION AND SURFACE DEFORMATION OF RUBBERSYoshitaka UCHIYAMA1985 Volume 58 Issue 5 Pages 319-327
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSWhen a glass lens was slid on a soft and smooth rubber, some conditions for the appearance of waves of detachment were established. The profile of the deformed rubber surface and the propagation of the waves were studied using an optical microscope. The waves of detachment appear when the sliding speed is higher than a critical speed vc, and the critical speed decreases with increasing an applied load. After propagation of the waves crossing the contact area the relative displacement between the two frictional members was occured. The fluctuation of the friction occured repeatedly accompanied with the passage of the waves.
Even at low speeds when the waves do not run, the rear part of the contact area loses the contact and after that the circular contact was regained. The rear detachment was observed periodically. The deformation of the rear edge was also observed at higher speeds when the waves were appeared.
The propagating speeds of the detachment waves are faster at higher sliding speeds and higher loads. The number of detachment waves formed in unit sliding distance increases at higher sliding speeds and lower loads.View full abstractDownload PDF (768K) -
Kunio MORI, Yoshiro NAKAMURA, Kouetu WADA1985 Volume 58 Issue 5 Pages 328-334
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSCrosslinking adhesion of uncrosslinked rubbers to crosslinked rubbers has been investigated for various rubbers such as fluorine elastomer, hydrin elastomer, chlorinated polyethylene, NBR and SBR. By the combination of 2-dibutylamino-1, 3, 5-triazine-4, 6-dithiol (DB) and tetrabutyl ammonium bromide or tetrabutyl phosphonium bromide, the crosslinking adhesion of their rubbers even to considerably high crosslinking degree-having crosslinked rubbers was successfully completed. In this crosslinking adhesion, DB is a crosslinking agent in commen to their elastomers and the onium salts have two functions that accelerate the crosslinking of elastomers with DB and lower the interface tension between the elastomers. Therefore, to adhere strongly between the rubbers, it is neccesary to induce both the formation of interfacial layer between the rubbers and of covalent bonds between different rubber molecules in the layer.View full abstractDownload PDF (557K) -
Tadaoki OKUMOTO, Masayoshi ICHIKAWA, Masatoshi SUGIMOTO1985 Volume 58 Issue 5 Pages 335-341
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe outer cover rubber of hoses used in the fuel line is expected to be improved in its performance with heat aging and ozone resistance due to temperatures under the hood and the trend in automobile industry in general for longer life parts. Presently, fuel line hose has tended to increase to meet the requirement of the more resistance to heat aging and ozone. Because of normal epichlorohydrin rubber (CHR) tend to soften upon degradation during heat aging, we have been reluctant to use them due to poor reliability. Recently, a new type of epichlorohydrin rubber improved to degradation by the introduction of allylglycidyl ether to soften upon degradation during heat aging was developed. These new type of epichlorohydrin rubber with allylglycidyl ether (AGE-CHR) has been used as rubber parts in the exhaust gas tube to improve the heat aging resistance. Depending upon the content of allylglicidylether (AGE) in epichlorohydrin-ethylene oxide-allylglycidyl ether-terpolymer (AGE-CHC), it is much expected to be improved the resistance against softening upon heat aging and to be extended the time to initial appearance of ozone cracking after sequential aging. In this report, the effect of AGE content in AGE-CHC on heat aging resistance was studied. Also, the crack growth and the increased numbers after time to initial cracking about AGE-CHC in comparison with CR or CSM were determined. The effect on increasing concentration of AGE on sequential heat aging at 150°C for 300hrs was already shown by the small point of hardness change. Similarly, the time to initial appearance of ozone crack after sequential heat aging and continuous immersion in fuels were extended by depending upon AGE content in AGE-CHC. Especially, ozone resistance of AGE-CHC provides better than that of CR or CSM after sequential heat aging and immersion in fuels.View full abstractDownload PDF (542K) -
1985 Volume 58 Issue 5 Pages 342-343
Published: 1985
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (238K)
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