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Non-linear: Hyperelastic-Mooney-Rivlin Analysis

Question asked by Christopher Hardy on Oct 30, 2013
Latest reply on Nov 3, 2013 by Jared Conway



I recently did some compression tests on a rubber sample. From this I was able to attain experimental data for Solidworks to be used in the Hyperelastic Mooney-Rivlin Model.


Using the "Simple Tension" graph, ie Stretch Ratio (new length/original length) in relation to Stress (Force over original area). I was able to specify non-linear material properties to my rubber sample.


I have a problem when I try to model various runs of the experiment (same experimental testing/scenario, slightly different results). Some of the models are able to solve 100% according to its full time duration, others fail within a fraction of the duration. (From this, I know that the model is working correctly)


Does anyone have any ideas to why this might be occuring ? It seems logical that it all works right, considering the numbers might change ever so slightly witin like few % of each other


Is it some bad data in the results that can throw this analysis off, e.g like repeated stretch ratio values with different stress components ?  Or is it more an analysis factor in study properties?