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Natural Rubber Bushing Fatigue Analysis Comparing Multi Axis Test Stand Laboratory Data to Road Load Data using Palmgren - Miner Linear Rule

Fatigue design programs and computer codes can use Miner’s linear damage rule to evaluate potential fatigue damage. This presentation will demonstrate using a medium sized natural rubber production mount tested at various combinations of radial loads and torsion angles to an 80% drop off in radial static rate. This dropoff is one norm in the automotive industry to define fatigue failure. Power law curves were constructed from the test data showing the relationship between input radial load, input torsion angle and cycles to 80% rate falloff. Values representing road load data were assumed and Miners law was applied between the cycles in the road load data against cycles to failure from the power law test data. A method for initial evaluation of road load data vs actual bushing power law fatigue curves is demonstrated.   

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