Biaxial Tests
Consider the following figure for a hyperelastic material under biaxial testing
1. Initial configuration
2. Loaded configuration
3. Stress
4. Strain
In a biaxial test, the specimen is slowly loaded or pulled in two orthogonal directions, say the x- and y-directions. No other loads or constraints are applied to the specimen. For a nearly incompressible hyperelastic material, the stretch ratios are:
For test data specify engineering stress as:
Specify engineering strain as:
