I am studying about Impact load resistance property of Polyurea (Elastomer). With respect to this, I need to conduct tests on this material to evaluate its material model behavior as a hyperelastic material model and Viscoelastic material model. These material models are to be used in an FEA analysis to understand its impact resistance properties. I have researched some data mentioned below about the procedure to determine the viscoelastic properties and hyperelastic properties of an elastomer material.
Kindly review it and provide your valuable comments to improve it against discrepancies incurred by me.
Mechanical tests to be conducted for Hyper-Elastic model
1. Uniaxial Test (ASTM D 412/ ISO 37) - stress/ strain curve or table as output
2. Biaxial Test (ASTM D 6856 / ISO 16842:2014) - stress/ strain curve or table as output
3. Planar Test ( - stress/ strain curve or table as output
4. Bulk Modulus Test (ASTM D 575 / ISO 7743) - pressure/ volume ration curve or table as output
Mechanical tests to be conducted for Visco-Elastic model
5. Creep test ( Shear, Volumetric and Combined ) (ISO 8013) - constant load/stress will be applied as input and strain/ time curve will be taken as output
6. Relaxation Test (Shear, Volumetric and Combined) (ISO 3384) - constant deflection/strain will be applied as input and stress/time curve will be taken as the output
Test data derived from test no 1 to 4 shall be used to calculate Mooney-Rivlin hyperelastic material model parameters.
Test data derived from 5 & 6 will be used to calculate the following mechanical properties
a. long term normalized shear compliance or modulus
b. long term normalized volumetric compliance or modulus
c. normalized shear compliance or shear relaxation modulus vs. time
d. normalized volumetric compliance or volumetric relaxation modulus vs. time
The data mentioned from points a to d are needed to derive the Prony series constant for the viscous elastic material model mentioned below:
1. Shear relaxation modulus ratio
2. Bulk relaxation modulus ratio
3. Relaxation time
I have gone through ASTM/ ISO codes mentioned superficially but didn’t understand a few topics for some codes. I need your valuable guidance regarding the following points.
1. specimen preparation (Dimension and Shape)
2. Testing procedure. (Constant Load & Deflection required in test no 5 & 6)
3. Determination of properties mentioned in points (a to d) from test data output received from test no 5 & 6.
I have followed the procedure described in the file attached for property determination and conducted the test as per described codes.
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