Modeling of visco-hyperelastic materials based on the rate equi-biaxial tensile data extracted from a novel biaxial tensile testing machine

Elastomers exhibit significant visco-hyperelastic behavior, making rate-dependent data crucial for accurate modeling. It can be stated that incorporating biaxial rate data along with uniaxial rate data can enhance the accuracy of visco-hyperelastic material modeling. For this purpose, one of the main goals of this article is to design and manufacture a novel high-strain rate bulge test device for testing soft tissues and polymer membranes. Using this feature, constant biaxial stretch rate data was extracted at six different rates. In the following, the obtained biaxial test data with relaxation tests were used to calibrate the visco-hyperelastic model.