防振ゴムのせん断疲労に対する形状率ならびに初期圧縮の影響

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We have already reported that the radius of the fillet of the specimen has great influences upon the shearing fatigue life and the appearance of the fatigue crack. In this paper, we report on influences of the form factor and an initial compression on the shearing fatigue of the rubber vibration isolator. The test was performed under a constant repeating shear strain of 0〜30 % with a frequency of about 500 rpm, and using the specimens which had a thickness of 15 mm, diameters of 15, 20, 30 mm and radii of the fillet of 0, 2, 4, 6 and 7.5 mm. From these papers, we may summarized the shape effect on the shearing fatigue as follows : (1) The shearing fatigue life, which means the number of the strain repetitions up to the time when the fatigue crack appears on the surface of the specimen, gets longer as the radius of the fillet and the form factor increase. When an initial compression was given, the shearing fatigue life becomes longer. (2) The shearing fatigue cracks appeared in the same manner irrespective of the radius of the fillet, the form factor and the initial compression. The position of the crack appeared when the pasted plane was at an angle of about 25゜〜32゜ with the straight line connecting the edge of the fillet and the fatigue crack on the surface of the specimen. (3) The explanation of the fatigue phenomena of the rubber vibration isolator, especially the computation of the fatigue life and the position where the crack appeared, may e given from the consideration of the stress or strain on the deformed surface of the specimen. It is difficult for us to explain the above facts using the apparent stress or strain.
社団法人日本材料学会の論文
1961-06-15

防振ゴムのせん断疲労に対する形状率ならびに初期圧縮の影響

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