Fatigue prediction criteria for rubber antivibration design with temperature effects

Abstract

It is desirable to obtain a fatigue criterion that can be correlated to different rubbers with both mechanical and temperature effects. In this paper, we investigated the possibility to correlate the S-N base function to temperature environments. The published experimental data consisting of temperatures ranging from 23-90 ° C for rubber samples with 50 and 45 Shore hardness were used to validate the existing S-N base function. Concomitantly, a new S-N base function was derived by adding two temperature functions from the test data. In the two criteria, both the thermal expansion and the shear modulus change with temperature were considered. The results have shown that for the 50 Shore hardness rubber, approximately 94% of the points predicted using the existing function and 100% of the points using the new function fell within a scatter band of 1.5. For 45 Shore hardness rubber at 90°C, all predicted points using the existing function fell along the upper limit line of a scatter band of approximately 2.0. On the contrary, all predicted points at 90 ° C fell within a scatter band of 1.35 using the new function. Therefore, this potential novel approach could be used in both the design stages of antivibration rubber components.