This test data was donated by Axel Physical Testing Services   www.axelproducts.com

The material is a Natural Rubber / Butyl mix, so we use the abbreviation "NRB".

The attached Excel file contains three sets of test data all at 23 deg C.  

STSR - Simple tension Stress Relaxation

Cyclic data in uniaxial tension

Volumetric test data

Here is a narrated video showing the calibration of a hyperelastic + Prony + Mullins material model. This video was made using a development version of the calibration app in Feb, 2020.  That version of the app resembles the R2020x FD02, FP2014 release (released on April 3, 2020 for on-premise use, but not yet pushed to the public cloud). 

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