Abstract
Background
Several researchers have worked on the development of effective criteria for prediction of fatigue failure in rubber. Although many of these criteria have achieved some level of success, they are restrictive in the sense that they apply only to certain loading conditions.
Objective
A new criterion was proposed to evaluate damage for antivibration design and applications so that different loading modes would not alter the fatigue prediction.
Methods
It is hypothesized that shear deformation causes fatigue damage in rubber. An effective shear strain criterion was developed by combining three principal strain ranges and verified using the published experimental results from 4 loading sets: 14 tension cases; 31 torsion cases 26 combined tension–torsion cases in phase and 19 combined tension–torsion cases out of phase. In addition, the criterion was validated against a failure of an industrial mount.
Results
The predicted cracks were located at the maximum values of the criterion, consistent with where the cracks were observed experimentally. The predicted crack orientations correlated with the experimental measurement. The obtained S–N curve covered over 102 to 2.4 × 106 cycles, achieving high accuracy with a scatter-band of 1.9 based on the 90 fatigue cases.
Conclusions
This criterion seems effective and could be used at a stage of fatigue design. In addition, it could be combined with the critical plane method: the proposed approach could be used to find hot spots, whilst the critical plane search method could be utilised locally to find the maximum values of the required damage variables.
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Luo, R.K. Shear Criterion and Experimental Verification for Antivibration Fatigue Design. Exp Mech 62, 537–547 (2022). https://doi.org/10.1007/s11340-021-00807-5
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DOI: https://doi.org/10.1007/s11340-021-00807-5