This is test data from a single test of a virgin sample of EPDM rubber. This test data may be helpful in calibrating an elastomer model that includes hyperelasticity + viscoelasticity + Mullin's effect + plasticity.  The material specimen is a uniaxial dogbone.  Strain measurement is done with a laser extensometer.  Gauge length of the laser extensometer was not recorded.  Test was performed at room temperature. Nominal strain rate is 0.01  1/sec.  Loading is strain controlled with a small force unload stop to avoid buckling the specimen during the unload.  The specimen is first loaded to 10% engineering strain and unloaded 10 times.  Then the specimen is loaded/unloaded to 30% engineering strain 10 times, then the specimen is loaded/unloaded to 100% engineering strain 10 times.  This test data was kindly contributed by  Axel Products, Inc.

Click on the image below to download the Excel file of test data:

Dec 5, 2022:  A few more comments.  Here is a hyper-Prony-Mullins model calibration based on Marlow hyperelasticity.  In order to use Marlow you need to have a monotonic test, which I created from the cyclic data (not ideal). For a really good calibration it would be useful to have several monotonic uniaxial pull tests at various rates.

Having already done the calibration above, I switched from Marlow to Yeoh hyperelasticity.  I typed in a few different numbers for C10 until I got this image below.  I never clicked on "Calibrate".  
 

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