防振ゴムの振動試験においてみられるシクソトロピックな現象 : 高分子レオロジー

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When a rubber vibration insulator of tread type is given, for many fours, a torsional vibration with a fairly large strain amplitude, the observed amplitude of torsional moment, in the beginning, decreases nearly in proportion to the logarithm of the number of strain cycles and, after 4~9×10^6 cycles, it becomes keep about constant value. Furthermore, in the intermittent test which repeats the driving and cessation, the amplitude of torsional moment shows some recovery during cessation and especially after the second driving, these decrease and recovery appeares about the same extent. These facts are also attensioned as phenomena in teh early stage of fatigue process. While the gum type stock, which does not contain any carbon black, does not show such phenomena. The dynamical model used for the analysis of the dynamical behavior or rubber vibration insulator was already proposed by the one of the authors. The difference in the models between tread type and gum type stocks consist in the slider mechahism, so that the above thixotropic phenomena also arise from the characteristic change of the slider. Perhaps, it is due to the breakdown of the rubber-carbon bond. From our experiments, the rate of above decrease changes by the variations of the frequency of vibration, but the temperature does not affect upon it. In this paper, we considered on such thixotropic phenomena and derived the emipirical formulas between the amplitude of torsional moment and number of strain cycles, fitting for both cases of the virgin and the intermittent driving.
社団法人日本材料学会の論文
1960-04-15

防振ゴムの振動試験においてみられるシクソトロピックな現象 : 高分子レオロジー

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