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2.3 MECHANICAL ENGINEERING
This paper describes an equi-biaxial tension fatigue test system which utilises the bubble inflation method to subject elastomers to equi-biaxial fatigue loading between user-defined limits of pressure, volume, stretch ratio or stress. The test system integrates a hydraulic inflation system, a high speed vision system and a control system. The high-speed vision system allows the stretch ratio and stress acting on the test specimen to be evaluated in real-time during testing. This in turn allows either stretch ratio or stress to be used as a direct control limit. In this research, constant maximum engineering stress control tests have been carried out to evaluate the suitability of the developed dynamic bubble inflation system for equi-biaxial fatigue testing of elastomers. The resulting test data was used to produce Wöhler (S/N) curves and stress/stretch ratio plots for ethylene-propylene rubber (EPM).
Mark Johnson, Niall Murphy, Ray Ekins, John Hanley, Stephen Jerrams, Equi-biaxial fatigue testing of EPM utilising bubble inflation, Polymer Testing, Volume 53, 2016, Pages 122-131, ISSN 0142-9418, DOI: 10.1016/j.polymertesting.2016.05.017.