Biaxial material testing machine
Planar-biaxial experiments testing play an important role in materials modeling since, for incompressible-isotropic materials such as rubber, it can provide a complete characterization of the material properties.
Our custom-made setup for planar-biaxial materials testing was specifically designed for soft materials and biological tissues. Four hydraulic actuators are mounted on a positioning plate installed on a vibration isolation table. The primary configuration aligns the actuators in 90° angles for planar biaxial testing.
The actuators can be driven individually in displacement or force control-mode, whereas the loading profile can be defined by the operator. The actuators exhibit an interface to mount test-specific custom-built clamps. A biochamber can be installed for testing of biological tissues under physiological conditions, i.e. in a saline bath at 37°C. A video extensometer is used to determine the in-plane specimen displacement field from which the deformation and strain field can be computed.
4 hydraulic actuators
> 200 bar operating pressure
> 100 mm stroke
> 2.5 kN force capacity o loading rate up to 200 Hz
available load cells: 100 N, 2 kN
Software that allows to design complex test protocols (each actuator can be controlled individually or phase-controlled against a set of actuators)
Heated saline bath for environmental control: room temperature up to 45°C
Grip interface to mount test-specific clamps
Contactless specimen deformation measurement (digital image correlation)